Articles | Volume 15, issue 7
https://doi.org/10.5194/se-15-895-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-15-895-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 Jul 2024
Research article |
| 23 Jul 2024
| 23 Jul 2024
Naturally fractured reservoir characterisation in heterogeneous sandstones: insight for uranium in situ recovery (Imouraren, Niger)
Maxime Jamet
CORRESPONDING AUTHOR
Geosciences Montpellier, UMR 5243, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier CEDEX 5, France
Gregory Ballas
Geosciences Montpellier, UMR 5243, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier CEDEX 5, France
Roger Soliva
Geosciences Montpellier, UMR 5243, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier CEDEX 5, France
Olivier Gerbeaud
ORANO, BU Mines, Direction Géosciences, 125 avenue de Paris, 92320 Châtillon, France
Thierry Lefebvre
ORANO, BU Mines, Direction Géosciences, 125 avenue de Paris, 92320 Châtillon, France
Christine Leredde
Geosciences Montpellier, UMR 5243, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier CEDEX 5, France
Didier Loggia
Geosciences Montpellier, UMR 5243, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier CEDEX 5, France
Related authors
No articles found.
Leonardo Del Sole, Marco Antonellini, Roger Soliva, Gregory Ballas, Fabrizio Balsamo, and Giulio Viola
Solid Earth, 11, 2169–2195, https://doi.org/10.5194/se-11-2169-2020, https://doi.org/10.5194/se-11-2169-2020, 2020
Short summary
Short summary
This study focuses on the impact of deformation bands on fluid flow and diagenesis in porous sandstones in two different case studies (northern Apennines, Italy; Provence, France) by combining a variety of multiscalar mapping techniques, detailed field and microstructural observations, and stable isotope analysis. We show that deformation bands buffer and compartmentalize fluid flow and foster and localize diagenesis, recorded by carbonate cement nodules spatially associated with the bands.
Gaétan Milesi, Patrick Monié, Philippe Münch, Roger Soliva, Audrey Taillefer, Olivier Bruguier, Mathieu Bellanger, Michaël Bonno, and Céline Martin
Solid Earth, 11, 1747–1771, https://doi.org/10.5194/se-11-1747-2020, https://doi.org/10.5194/se-11-1747-2020, 2020
Short summary
Short summary
This study proposes a new way to highlight hydrothermal fluid circulations and thermal anomalies in the Earth's crust with a combined evaluation of the age of granite and gneiss apatites (< 200 µm) as well as the behaviour of their chemical elements. As an exploration tool, this approach is very promising and complementary to other geothermal exploration techniques based on numerical modelling. Moreover, it is a cost-effective tool as it allows for constraining geothermal models.
Roger Soliva, Frantz Maerten, Laurent Maerten, and Jussi Mattila
Solid Earth, 10, 1141–1154, https://doi.org/10.5194/se-10-1141-2019, https://doi.org/10.5194/se-10-1141-2019, 2019
Short summary
Short summary
We propose innovative parametric modeling allowing for analysis of a very large number of fault-slip numerical simulations on 3-D discrete fault network. The approach allows for the first time producing failure envelopes of large rock volumes containing faults, using variations of geological conditions such as remote stresses, cohesion, friction, and fluid pressure. This tool helps to define the most conservative fault slip hazard case or to account for potential uncertainties in the input data.
Related subject area
Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Structural geology and tectonics, paleoseismology, rock physics, experimental deformation | Discipline: Structural geology
Driven magmatism and crustal thinning of coastal southern China in response to subduction
Selection and characterization of the target fault for fluid-induced activation and earthquake rupture experiments
Influence of water on crystallographic preferred orientation patterns in a naturally-deformed quartzite
Multiscalar 3D temporal structural characterisation of Smøla island, mid-Norwegian passive margin: an analogue for unravelling the tectonic history of offshore basement highs
Localized shear versus distributed strain accumulation as shear-accommodation mechanisms in ductile shear zones: Constraining their dictating factors
Impact of faults on the remote stress state
Subduction plate interface shear stress associated with rapid subduction at deep slow earthquake depths: example from the Sanbagawa belt, southwestern Japan
Multiple phase rifting and subsequent inversion in the West Netherlands Basin: implications for geothermal reservoir characterization
Analogue modelling of basin inversion: implications for the Araripe Basin (Brazil)
Geomorphic expressions of active rifting reflect the role of structural inheritance: A new model for the evolution of the Shanxi Rift, North China
Natural fracture patterns at Swift Reservoir anticline, NW Montana: the influence of structural position and lithology from multiple observation scales
Rapid hydration and weakening of anhydrite under stress: implications for natural hydration in the Earth's crust and mantle
Analogue experiments on releasing and restraining bends and their application to the study of the Barents Shear Margin
Structural framework and timing of the Pahtohavare Cu ± Au deposits, Kiruna mining district, Sweden
Does the syn- versus post-rift thickness ratio have an impact on the inversion-related structural style?
Inversion of accommodation zones in salt-bearing extensional systems: insights from analog modeling
Structural control of inherited salt structures during inversion of a domino basement-fault system from an analogue modelling approach
Kinematics and time-resolved evolution of the main thrust-sense shear zone in the Eo-Alpine orogenic wedge (the Vinschgau Shear Zone, eastern Alps)
Role of inheritance during tectonic inversion of a rift system in basement-involved to salt-decoupled transition: analogue modelling and application to the Pyrenean–Biscay system
Water release and homogenization by dynamic recrystallization of quartz
Hydrothermal activity of the Lake Abhe geothermal field (Djibouti): Structural controls and paths for further exploration
Time-dependent frictional properties of granular materials used in analogue modelling: implications for mimicking fault healing during reactivation and inversion
Large grain-size-dependent rheology contrasts of halite at low differential stress: evidence from microstructural study of naturally deformed gneissic Zechstein 2 rock salt (Kristallbrockensalz) from the northern Netherlands
Analogue modelling of the inversion of multiple extensional basins in foreland fold-and-thrust belts
A contribution to the quantification of crustal shortening and kinematics of deformation across the Western Andes ( ∼ 20–22° S)
Rift thermal inheritance in the SW Alps (France): insights from RSCM thermometry and 1D thermal numerical modelling
The Luangwa Rift Active Fault Database and fault reactivation along the southwestern branch of the East African Rift
Clustering has a meaning: optimization of angular similarity to detect 3D geometric anomalies in geological terrains
Shear zone evolution and the path of earthquake rupture
Mechanical compaction mechanisms in the input sediments of the Sumatra subduction complex – insights from microstructural analysis of cores from IODP Expedition 362
Detecting micro fractures: a comprehensive comparison of conventional and machine-learning-based segmentation methods
Multiscale lineament analysis and permeability heterogeneity of fractured crystalline basement blocks
Structural characterization and K–Ar illite dating of reactivated, complex and heterogeneous fault zones: lessons from the Zuccale Fault, Northern Apennines
How do differences in interpreting seismic images affect estimates of geological slip rates?
Progressive veining during peridotite carbonation: insights from listvenites in Hole BT1B, Samail ophiolite (Oman)
Tectonic evolution of the Indio Hills segment of the San Andreas fault in southern California, southwestern USA
Structural diagenesis in ultra-deep tight sandstones in the Kuqa Depression, Tarim Basin, China
Variscan structures and their control on latest to post-Variscan basin architecture: insights from the westernmost Bohemian Massif and southeastern Germany
Multi-disciplinary characterizations of the BedrettoLab – a new underground geoscience research facility
Biotite supports long-range diffusive transport in dissolution–precipitation creep in halite through small porosity fluctuations
De-risking the energy transition by quantifying the uncertainties in fault stability
Virtual field trip to the Esla Nappe (Cantabrian Zone, NW Spain): delivering traditional geological mapping skills remotely using real data
Marine forearc structure of eastern Java and its role in the 1994 Java tsunami earthquake
Roughness of fracture surfaces in numerical models and laboratory experiments
Impact of basement thrust faults on low-angle normal faults and rift basin evolution: a case study in the Enping sag, Pearl River Basin
Evidence for and significance of the Late Cretaceous Asteroussia event in the Gondwanan Ios basement terranes
Investigating spatial heterogeneity within fracture networks using hierarchical clustering and graph distance metrics
Dating folding beyond folding, from layer-parallel shortening to fold tightening, using mesostructures: lessons from the Apennines, Pyrenees, and Rocky Mountains
Deformation-enhanced diagenesis and bacterial proliferation in the Nankai accretionary prism
Rheological stratification in impure rock salt during long-term creep: morphology, microstructure, and numerical models of multilayer folds in the Ocnele Mari salt mine, Romania
Jinbao Su, Wenbin Zhu, and Guangwei Li
Solid Earth, 15, 1133–1141, https://doi.org/10.5194/se-15-1133-2024, https://doi.org/10.5194/se-15-1133-2024, 2024
Short summary
Short summary
The late Mesozoic igneous rocks in the South China Block exhibit flare-ups and lulls, which form in compressional or extensional backgrounds. The ascending of magma forms a mush-like head and decreases crustal thickness. The presence of faults and pre-existing magmas will accelerate emplacement of underplating magma. The magmatism at different times may be formed under similar subduction conditions, and the boundary compression forces will delay magma ascent.
Peter Achtziger-Zupančič, Alberto Ceccato, Alba Simona Zappone, Giacomo Pozzi, Alexis Shakas, Florian Amann, Whitney Maria Behr, Daniel Escallon Botero, Domenico Giardini, Marian Hertrich, Mohammadreza Jalali, Xiaodong Ma, Men-Andrin Meier, Julian Osten, Stefan Wiemer, and Massimo Cocco
Solid Earth, 15, 1087–1112, https://doi.org/10.5194/se-15-1087-2024, https://doi.org/10.5194/se-15-1087-2024, 2024
Short summary
Short summary
We detail the selection and characterization of a fault zone for earthquake experiments in the Fault Activation and Earthquake Ruptures (FEAR) project at the Bedretto Lab. FEAR, which studies earthquake processes, overcame data collection challenges near faults. The fault zone in Rotondo granite was selected based on geometry, monitorability, and hydro-mechanical properties. Remote sensing, borehole logging, and geological mapping were used to create a 3D model for precise monitoring.
Jeffrey M. Rahl, Brendan Moehringer, Kenneth S. Befus, and John S. Singleton
EGUsphere, https://doi.org/10.5194/egusphere-2024-1567, https://doi.org/10.5194/egusphere-2024-1567, 2024
Short summary
Short summary
At the high temperatures present in the deeper crust, minerals such as quartz can flow much like silly putty. The detailed mechanisms of how atoms are reorganized depends upon several factors, such as the temperature and the rate of which the mineral changes shape. We present observations from a naturally-deformed rock showing that the amount of water present also influences the type of deformation in quartz, with implications for geological interpretations.
Matthew S. Hodge, Guri Venvik, Jochen Knies, Roelant van der Lelij, Jasmin Schönenberger, Øystein Nordgulen, Marco Brönner, Aziz Nasuti, and Giulio Viola
Solid Earth, 15, 589–615, https://doi.org/10.5194/se-15-589-2024, https://doi.org/10.5194/se-15-589-2024, 2024
Short summary
Short summary
Smøla island, in the mid-Norwegian margin, has complex fracture and fault patterns resulting from tectonic activity. This study uses a multiple-method approach to unravel Smøla's tectonic history. We found five different phases of deformation related to various fracture geometries and minerals dating back hundreds of millions of years. 3D models of these features visualise these structures in space. This approach may help us to understand offshore oil and gas reservoirs hosted in the basement.
Pramit Chatterjee, Arnab Roy, and Nibir Mandal
EGUsphere, https://doi.org/10.5194/egusphere-2024-1077, https://doi.org/10.5194/egusphere-2024-1077, 2024
Short summary
Short summary
Understanding the strain accumulation processes in ductile shear zones is essential to explain the failure mechanisms at great crustal depths. This study explores the rheological and kinematic factors determining the varying modes of shear accommodation in natural shear zones. Numerical simulations suggest that an interplay of the following parameters: initial bulk viscosity, bulk shear rate, and internal cohesion governs the dominance of one accommodation mechanism over the other.
Karsten Reiter, Oliver Heidbach, and Moritz O. Ziegler
Solid Earth, 15, 305–327, https://doi.org/10.5194/se-15-305-2024, https://doi.org/10.5194/se-15-305-2024, 2024
Short summary
Short summary
It is generally assumed that faults have an influence on the stress state of the Earth’s crust. It is questionable whether this influence is still present far away from a fault. Simple numerical models were used to investigate the extent of the influence of faults on the stress state. Several models with different fault representations were investigated. The stress fluctuations further away from the fault (> 1 km) are very small.
Yukinojo Koyama, Simon R. Wallis, and Takayoshi Nagaya
Solid Earth, 15, 143–166, https://doi.org/10.5194/se-15-143-2024, https://doi.org/10.5194/se-15-143-2024, 2024
Short summary
Short summary
Stress along a subduction plate boundary is important for understanding subduction phenomena such as earthquakes. We estimated paleo-stress using quartz recrystallized grain size combined with deformation temperature and P–T paths of exhumed rocks. The obtained results show differential stresses of 30.8–82.7 MPa consistent over depths of 17–27 km in the paleo-subduction boundary. The obtained stress may represent the initial conditions under which slow earthquakes nucleated in the same domain.
Annelotte Weert, Kei Ogata, Francesco Vinci, Coen Leo, Giovanni Bertotti, Jerome Amory, and Stefano Tavani
Solid Earth, 15, 121–141, https://doi.org/10.5194/se-15-121-2024, https://doi.org/10.5194/se-15-121-2024, 2024
Short summary
Short summary
On the road to a sustainable planet, geothermal energy is considered one of the main substitutes when it comes to heating. The geological history of an area can have a major influence on the application of these geothermal systems, as demonstrated in the West Netherlands Basin. Here, multiple episodes of rifting and subsequent basin inversion have controlled the distribution of the reservoir rocks, thus influencing the locations where geothermal energy can be exploited.
Pâmela C. Richetti, Frank Zwaan, Guido Schreurs, Renata S. Schmitt, and Timothy C. Schmid
Solid Earth, 14, 1245–1266, https://doi.org/10.5194/se-14-1245-2023, https://doi.org/10.5194/se-14-1245-2023, 2023
Short summary
Short summary
The Araripe Basin in NE Brazil was originally formed during Cretaceous times, as South America and Africa broke up. The basin is an important analogue to offshore South Atlantic break-up basins; its sediments were uplifted and are now found at 1000 m height, allowing for studies thereof, but the cause of the uplift remains debated. Here we ran a series of tectonic laboratory experiments that show how a specific plate tectonic configuration can explain the evolution of the Araripe Basin.
Malte Froemchen, Ken J. W. McCaffrey, Mark B. Allen, Jeroen van Hunen, Thomas B. Phillips, and Yueren Xu
EGUsphere, https://doi.org/10.5194/egusphere-2023-2563, https://doi.org/10.5194/egusphere-2023-2563, 2023
Short summary
Short summary
The Shanxi Rift is a young active rift in North China that formed superimposed on a Proterozoic orogen. The impact of these structures on the active rift faults is poorly constrained. Here we quantify the landscape response to active faulting and compare these to published maps of inherited structures. We find that inherited structures played an important role in the segmentation of the Shanxi Rift and in the development of Rift Interaction Zones, the most active regions of the Shanxi Rift.
Adam J. Cawood, Hannah Watkins, Clare E. Bond, Marian J. Warren, and Mark A. Cooper
Solid Earth, 14, 1005–1030, https://doi.org/10.5194/se-14-1005-2023, https://doi.org/10.5194/se-14-1005-2023, 2023
Short summary
Short summary
Here we test conceptual models of fracture development by investigating fractures across multiple scales. We find that most fractures increase in abundance towards the fold hinge, and we interpret these as being fold related. Other fractures at the site show inconsistent orientations and are unrelated to fold formation. Our results show that predicting fracture patterns requires the consideration of multiple geologic variables.
Johanna Heeb, David Healy, Nicholas E. Timms, and Enrique Gomez-Rivas
Solid Earth, 14, 985–1003, https://doi.org/10.5194/se-14-985-2023, https://doi.org/10.5194/se-14-985-2023, 2023
Short summary
Short summary
Hydration of rocks is a key process in the Earth’s crust and mantle that is accompanied by changes in physical traits and mechanical behaviour of rocks. This study assesses the influence of stress on hydration reaction kinetics and mechanics in experiments on anhydrite. We show that hydration occurs readily under stress and results in localized hydration along fractures and mechanic weakening. New gypsum growth is selective and depends on the stress field and host anhydrite crystal orientation.
Roy Helge Gabrielsen, Panagiotis Athanasios Giannenas, Dimitrios Sokoutis, Ernst Willingshofer, Muhammad Hassaan, and Jan Inge Faleide
Solid Earth, 14, 961–983, https://doi.org/10.5194/se-14-961-2023, https://doi.org/10.5194/se-14-961-2023, 2023
Short summary
Short summary
The Barents Shear Margin defines the border between the relatively shallow Barents Sea that is situated on a continental plate and the deep ocean. This margin's evolution history was probably influenced by plate tectonic reorganizations. From scaled experiments, we deduced several types of structures (faults, folds, and sedimentary basins) that help us to improve the understanding of the history of the opening of the North Atlantic.
Leslie Logan, Ervin Veress, Joel B. H. Andersson, Olof Martinsson, and Tobias E. Bauer
Solid Earth, 14, 763–784, https://doi.org/10.5194/se-14-763-2023, https://doi.org/10.5194/se-14-763-2023, 2023
Short summary
Short summary
The Pahtohavare Cu ± Au deposits in the Kiruna mining district have a dubious timing of formation and have not been contextualized within an up-to-date tectonic framework. Structural mapping was carried out to reveal that the deposits are hosted in brittle structures that cut a noncylindrical, SE-plunging anticline constrained to have formed during the late-Svecokarelian orogeny. These results show that Cu ± Au mineralization formed more than ca. 80 Myr after iron oxide–apatite mineralization.
Alexandra Tamas, Dan M. Tamas, Gabor Tari, Csaba Krezsek, Alexandru Lapadat, and Zsolt Schleder
Solid Earth, 14, 741–761, https://doi.org/10.5194/se-14-741-2023, https://doi.org/10.5194/se-14-741-2023, 2023
Short summary
Short summary
Tectonic processes are complex and often difficult to understand due to the limitations of surface or subsurface data. One such process is inversion tectonics, which means that an area initially developed in an extension (such as the opening of an ocean) is reversed to compression (the process leading to mountain building). In this research, we use a laboratory method (analogue modelling), and with the help of a sandbox, we try to better understand structures (folds/faults) related to inversion.
Elizabeth Parker Wilson, Pablo Granado, Pablo Santolaria, Oriol Ferrer, and Josep Anton Muñoz
Solid Earth, 14, 709–739, https://doi.org/10.5194/se-14-709-2023, https://doi.org/10.5194/se-14-709-2023, 2023
Short summary
Short summary
This work focuses on the control of accommodation zones on extensional and subsequent inversion in salt-detached domains using sandbox analogue models. During extension, the transfer zone acts as a pathway for the movement of salt, changing the expected geometries. When inverted, the salt layer and syn-inversion sedimentation control the deformation style in the salt-detached cover system. Three natural cases are compared to the model results and show similar inversion geometries.
Oriol Ferrer, Eloi Carola, and Ken McClay
Solid Earth, 14, 571–589, https://doi.org/10.5194/se-14-571-2023, https://doi.org/10.5194/se-14-571-2023, 2023
Short summary
Short summary
Using an experimental approach based on scaled sandbox models, this work aims to understand how salt above different rotational fault blocks influences the cover geometry and evolution, first during extension and then during inversion. The results show that inherited salt structures constrain contractional deformation. We show for the first time how welds and fault welds are reopened during contractional deformation, having direct implications for the subsurface exploration of natural resources.
Chiara Montemagni, Stefano Zanchetta, Martina Rocca, Igor M. Villa, Corrado Morelli, Volkmar Mair, and Andrea Zanchi
Solid Earth, 14, 551–570, https://doi.org/10.5194/se-14-551-2023, https://doi.org/10.5194/se-14-551-2023, 2023
Short summary
Short summary
The Vinschgau Shear Zone (VSZ) is one of the largest and most significant shear zones developed within the Late Cretaceous thrust stack in the Austroalpine domain of the eastern Alps. 40Ar / 39Ar geochronology constrains the activity of the VSZ between 97 and 80 Ma. The decreasing vorticity towards the core of the shear zone, coupled with the younging of mylonites, points to a shear thinning behavior. The deepest units of the Eo-Alpine orogenic wedge were exhumed along the VSZ.
Jordi Miró, Oriol Ferrer, Josep Anton Muñoz, and Gianreto Manastchal
Solid Earth, 14, 425–445, https://doi.org/10.5194/se-14-425-2023, https://doi.org/10.5194/se-14-425-2023, 2023
Short summary
Short summary
Using the Asturian–Basque–Cantabrian system and analogue (sandbox) models, this work focuses on the linkage between basement-controlled and salt-decoupled domains and how deformation is accommodated between the two during extension and subsequent inversion. Analogue models show significant structural variability in the transitional domain, with oblique structures that can be strongly modified by syn-contractional sedimentation. Experimental results are consistent with the case study.
Junichi Fukuda, Takamoto Okudaira, and Yukiko Ohtomo
Solid Earth, 14, 409–424, https://doi.org/10.5194/se-14-409-2023, https://doi.org/10.5194/se-14-409-2023, 2023
Short summary
Short summary
We measured water distributions in deformed quartz by infrared spectroscopy mapping and used the results to discuss changes in water distribution resulting from textural development. Because of the grain size reduction process (dynamic recrystallization), water contents decrease from 40–1750 wt ppm in host grains of ~2 mm to 100–510 wt ppm in recrystallized regions composed of fine grains of ~10 µm. Our results indicate that water is released and homogenized by dynamic recrystallization.
Bastien Walter, Yves Géraud, Alexiane Favier, Nadjib Chibati, and Marc Diraison
EGUsphere, https://doi.org/10.5194/egusphere-2023-397, https://doi.org/10.5194/egusphere-2023-397, 2023
Preprint archived
Short summary
Short summary
Lake Abhe in southwestern Djibouti is known for its exposures of massive hydrothermal chimneys and hot springs on the lake’s eastern shore. This study highlights the control of the main structural faults of the area on the development of these hydrothermal features. This work contributes to better understand hydrothermal fluid pathways in this area and may help further exploration for the geothermal development of this remarkable site.
Michael Rudolf, Matthias Rosenau, and Onno Oncken
Solid Earth, 14, 311–331, https://doi.org/10.5194/se-14-311-2023, https://doi.org/10.5194/se-14-311-2023, 2023
Short summary
Short summary
Analogue models of tectonic processes rely on the reproduction of their geometry, kinematics and dynamics. An important property is fault behaviour, which is linked to the frictional characteristics of the fault gouge. This is represented by granular materials, such as quartz sand. In our study we investigate the time-dependent frictional properties of various analogue materials and highlight their impact on the suitability of these materials for analogue models focusing on fault reactivation.
Jessica Barabasch, Joyce Schmatz, Jop Klaver, Alexander Schwedt, and Janos L. Urai
Solid Earth, 14, 271–291, https://doi.org/10.5194/se-14-271-2023, https://doi.org/10.5194/se-14-271-2023, 2023
Short summary
Short summary
We analysed Zechstein salt with microscopes and observed specific microstructures that indicate much faster deformation in rock salt with fine halite grains when compared to salt with larger grains. This is important because people build large cavities in the subsurface salt for energy storage or want to deposit radioactive waste inside it. When engineers and scientists use grain-size data and equations that include this mechanism, it will help to make better predictions in geological models.
Nicolás Molnar and Susanne Buiter
Solid Earth, 14, 213–235, https://doi.org/10.5194/se-14-213-2023, https://doi.org/10.5194/se-14-213-2023, 2023
Short summary
Short summary
Progression of orogenic wedges over pre-existing extensional structures is common in nature, but deciphering the spatio-temporal evolution of deformation from the geological record remains challenging. Our laboratory experiments provide insights on how horizontal stresses are transferred across a heterogeneous crust, constrain which pre-shortening conditions can either favour or hinder the reactivatation of extensional structures, and explain what implications they have on critical taper theory.
Tania Habel, Martine Simoes, Robin Lacassin, Daniel Carrizo, and German Aguilar
Solid Earth, 14, 17–42, https://doi.org/10.5194/se-14-17-2023, https://doi.org/10.5194/se-14-17-2023, 2023
Short summary
Short summary
The Central Andes are one of the most emblematic reliefs on Earth, but their western flank remains understudied. Here we explore two rare key sites in the hostile conditions of the Atacama desert to build cross-sections, quantify crustal shortening, and discuss the timing of this deformation at ∼20–22°S. We propose that the structures of the Western Andes accommodated significant crustal shortening here, but only during the earliest stages of mountain building.
Naïm Célini, Frédéric Mouthereau, Abdeltif Lahfid, Claude Gout, and Jean-Paul Callot
Solid Earth, 14, 1–16, https://doi.org/10.5194/se-14-1-2023, https://doi.org/10.5194/se-14-1-2023, 2023
Short summary
Short summary
We investigate the peak temperature of sedimentary rocks of the SW Alps (France), using Raman spectroscopy on carbonaceous material. This method provides an estimate of the peak temperature achieved by organic-rich rocks. To determine the timing and the tectonic context of the origin of these temperatures we use 1D thermal modelling. We find that the high temperatures up to 300 °C were achieved during precollisional extensional events, not during tectonic burial in the Western Alps.
Luke N. J. Wedmore, Tess Turner, Juliet Biggs, Jack N. Williams, Henry M. Sichingabula, Christine Kabumbu, and Kawawa Banda
Solid Earth, 13, 1731–1753, https://doi.org/10.5194/se-13-1731-2022, https://doi.org/10.5194/se-13-1731-2022, 2022
Short summary
Short summary
Mapping and compiling the attributes of faults capable of hosting earthquakes are important for the next generation of seismic hazard assessment. We document 18 active faults in the Luangwa Rift, Zambia, in an active fault database. These faults are between 9 and 207 km long offset Quaternary sediments, have scarps up to ~30 m high, and are capable of hosting earthquakes from Mw 5.8 to 8.1. We associate the Molaza Fault with surface ruptures from two unattributed M 6+ 20th century earthquakes.
Michał P. Michalak, Lesław Teper, Florian Wellmann, Jerzy Żaba, Krzysztof Gaidzik, Marcin Kostur, Yuriy P. Maystrenko, and Paulina Leonowicz
Solid Earth, 13, 1697–1720, https://doi.org/10.5194/se-13-1697-2022, https://doi.org/10.5194/se-13-1697-2022, 2022
Short summary
Short summary
When characterizing geological/geophysical surfaces, various geometric attributes are calculated, such as dip angle (1D) or dip direction (2D). However, the boundaries between specific values may be subjective and without optimization significance, resulting from using default color palletes. This study proposes minimizing cosine distance among within-cluster observations to detect 3D anomalies. Our results suggest that the method holds promise for identification of megacylinders or megacones.
Erik M. Young, Christie D. Rowe, and James D. Kirkpatrick
Solid Earth, 13, 1607–1629, https://doi.org/10.5194/se-13-1607-2022, https://doi.org/10.5194/se-13-1607-2022, 2022
Short summary
Short summary
Studying how earthquakes spread deep within the faults they originate from is crucial to improving our understanding of the earthquake process. We mapped preserved ancient earthquake surfaces that are now exposed in South Africa and studied their relationship with the shape and type of rocks surrounding them. We determined that these surfaces are not random and are instead associated with specific kinds of rocks and that their shape is linked to the evolution of the faults in which they occur.
Sivaji Lahiri, Kitty L. Milliken, Peter Vrolijk, Guillaume Desbois, and Janos L. Urai
Solid Earth, 13, 1513–1539, https://doi.org/10.5194/se-13-1513-2022, https://doi.org/10.5194/se-13-1513-2022, 2022
Short summary
Short summary
Understanding the mechanism of mechanical compaction is important. Previous studies on mechanical compaction were mostly done by performing experiments. Studies on natural rocks are rare due to compositional heterogeneity of the sedimentary succession with depth. Due to remarkable similarity in composition and grain size, the Sumatra subduction complex provides a unique opportunity to study the micromechanism of mechanical compaction on natural samples.
Dongwon Lee, Nikolaos Karadimitriou, Matthias Ruf, and Holger Steeb
Solid Earth, 13, 1475–1494, https://doi.org/10.5194/se-13-1475-2022, https://doi.org/10.5194/se-13-1475-2022, 2022
Short summary
Short summary
This research article focuses on filtering and segmentation methods employed in high-resolution µXRCT studies for crystalline rocks, bearing fractures, or fracture networks, of very small aperture. Specifically, we focus on the identification of artificially induced (via quenching) fractures in Carrara marble samples. Results from the same dataset from all five different methods adopted were produced and compared with each other in terms of their output quality and time efficiency.
Alberto Ceccato, Giulia Tartaglia, Marco Antonellini, and Giulio Viola
Solid Earth, 13, 1431–1453, https://doi.org/10.5194/se-13-1431-2022, https://doi.org/10.5194/se-13-1431-2022, 2022
Short summary
Short summary
The Earth's surface is commonly characterized by the occurrence of fractures, which can be mapped, and their can be geometry quantified on digital representations of the surface at different scales of observation. Here we present a series of analytical and statistical tools, which can aid the quantification of fracture spatial distribution at different scales. In doing so, we can improve our understanding of how fracture geometry and geology affect fluid flow within the fractured Earth crust.
Giulio Viola, Giovanni Musumeci, Francesco Mazzarini, Lorenzo Tavazzani, Manuel Curzi, Espen Torgersen, Roelant van der Lelij, and Luca Aldega
Solid Earth, 13, 1327–1351, https://doi.org/10.5194/se-13-1327-2022, https://doi.org/10.5194/se-13-1327-2022, 2022
Short summary
Short summary
A structural-geochronological approach helps to unravel the Zuccale Fault's architecture. By mapping its internal structure and dating some of its fault rocks, we constrained a deformation history lasting 20 Myr starting at ca. 22 Ma. Such long activity is recorded by now tightly juxtaposed brittle structural facies, i.e. different types of fault rocks. Our results also have implications on the regional evolution of the northern Apennines, of which the Zuccale Fault is an important structure.
Wan-Lin Hu
Solid Earth, 13, 1281–1290, https://doi.org/10.5194/se-13-1281-2022, https://doi.org/10.5194/se-13-1281-2022, 2022
Short summary
Short summary
Having a seismic image is generally expected to enable us to better determine fault geometry and thus estimate geological slip rates accurately. However, the process of interpreting seismic images may introduce unintended uncertainties, which have not yet been widely discussed. Here, a case of a shear fault-bend fold in the frontal Himalaya is used to demonstrate how differences in interpretations can affect the following estimates of slip rates and dependent conclusions.
Manuel D. Menzel, Janos L. Urai, Estibalitz Ukar, Thierry Decrausaz, and Marguerite Godard
Solid Earth, 13, 1191–1218, https://doi.org/10.5194/se-13-1191-2022, https://doi.org/10.5194/se-13-1191-2022, 2022
Short summary
Short summary
Mantle rocks can bind large quantities of carbon by reaction with CO2, but this capacity requires fluid pathways not to be clogged by carbonate. We studied mantle rocks from Oman to understand the mechanisms allowing their transformation into carbonate and quartz. Using advanced imaging techniques, we show that abundant veins were essential fluid pathways driving the reaction. Our results show that tectonic stress was important for fracture opening and a key ingredient for carbon fixation.
Jean-Baptiste P. Koehl, Steffen G. Bergh, and Arthur G. Sylvester
Solid Earth, 13, 1169–1190, https://doi.org/10.5194/se-13-1169-2022, https://doi.org/10.5194/se-13-1169-2022, 2022
Short summary
Short summary
The San Andreas fault is a major active fault associated with ongoing earthquake sequences in southern California. The present study investigates the development of the Indio Hills area in the Coachella Valley along the main San Andreas fault and the Indio Hills fault. The Indio Hills area is located near an area with high ongoing earthquake activity (Brawley seismic zone), and, therefore, its recent tectonic evolution has implications for earthquake prediction.
Jin Lai, Dong Li, Yong Ai, Hongkun Liu, Deyang Cai, Kangjun Chen, Yuqiang Xie, and Guiwen Wang
Solid Earth, 13, 975–1002, https://doi.org/10.5194/se-13-975-2022, https://doi.org/10.5194/se-13-975-2022, 2022
Short summary
Short summary
(1) Structural diagenesis analysis is performed on the ultra-deep tight sandstone. (2) Fracture and intergranular pores are related to the low in situ stress magnitudes. (3) Dissolution is associated with the presence of fracture.
Hamed Fazlikhani, Wolfgang Bauer, and Harald Stollhofen
Solid Earth, 13, 393–416, https://doi.org/10.5194/se-13-393-2022, https://doi.org/10.5194/se-13-393-2022, 2022
Short summary
Short summary
Interpretation of newly acquired FRANKEN 2D seismic survey data in southeeastern Germany shows that upper Paleozoic low-grade metasedimentary rocks and possible nappe units are transported by Variscan shear zones to ca. 65 km west of the Franconian Fault System (FFS). We show that the locations of post-Variscan upper Carboniferous–Permian normal faults and associated graben and half-graben basins are controlled by the geometry of underlying Variscan shear zones.
Xiaodong Ma, Marian Hertrich, Florian Amann, Kai Bröker, Nima Gholizadeh Doonechaly, Valentin Gischig, Rebecca Hochreutener, Philipp Kästli, Hannes Krietsch, Michèle Marti, Barbara Nägeli, Morteza Nejati, Anne Obermann, Katrin Plenkers, Antonio P. Rinaldi, Alexis Shakas, Linus Villiger, Quinn Wenning, Alba Zappone, Falko Bethmann, Raymi Castilla, Francisco Seberto, Peter Meier, Thomas Driesner, Simon Loew, Hansruedi Maurer, Martin O. Saar, Stefan Wiemer, and Domenico Giardini
Solid Earth, 13, 301–322, https://doi.org/10.5194/se-13-301-2022, https://doi.org/10.5194/se-13-301-2022, 2022
Short summary
Short summary
Questions on issues such as anthropogenic earthquakes and deep geothermal energy developments require a better understanding of the fractured rock. Experiments conducted at reduced scales but with higher-resolution observations can shed some light. To this end, the BedrettoLab was recently established in an existing tunnel in Ticino, Switzerland, with preliminary efforts to characterize realistic rock mass behavior at the hectometer scale.
Berit Schwichtenberg, Florian Fusseis, Ian B. Butler, and Edward Andò
Solid Earth, 13, 41–64, https://doi.org/10.5194/se-13-41-2022, https://doi.org/10.5194/se-13-41-2022, 2022
Short summary
Short summary
Hydraulic rock properties such as porosity and permeability are relevant factors that have an impact on groundwater resources, geological repositories and fossil fuel reservoirs. We investigate the influence of chemical compaction upon the porosity evolution in salt–biotite mixtures and related transport length scales by conducting laboratory experiments in combination with 4-D analysis. Our observations invite a renewed discussion of the effect of sheet silicates on chemical compaction.
David Healy and Stephen Paul Hicks
Solid Earth, 13, 15–39, https://doi.org/10.5194/se-13-15-2022, https://doi.org/10.5194/se-13-15-2022, 2022
Short summary
Short summary
The energy transition requires operations in faulted rocks. To manage the technical challenges and public concern over possible induced earthquakes, we need to quantify the risks. We calculate the probability of fault slip based on uncertain inputs, stresses, fluid pressures, and the mechanical properties of rocks in fault zones. Our examples highlight the specific gaps in our knowledge. Citizen science projects could produce useful data and include the public in the discussions about hazards.
Manuel I. de Paz-Álvarez, Thomas G. Blenkinsop, David M. Buchs, George E. Gibbons, and Lesley Cherns
Solid Earth, 13, 1–14, https://doi.org/10.5194/se-13-1-2022, https://doi.org/10.5194/se-13-1-2022, 2022
Short summary
Short summary
We describe a virtual geological mapping course implemented in response to travelling and social restrictions derived from the ongoing COVID-19 pandemic. The course was designed to replicate a physical mapping exercise as closely as possible with the aid of real field data and photographs collected by the authors during previous years in the Cantabrian Zone (NW Spain). The course is delivered through Google Earth via a KMZ file with outcrop descriptions and links to GitHub-hosted photographs.
Yueyang Xia, Jacob Geersen, Dirk Klaeschen, Bo Ma, Dietrich Lange, Michael Riedel, Michael Schnabel, and Heidrun Kopp
Solid Earth, 12, 2467–2477, https://doi.org/10.5194/se-12-2467-2021, https://doi.org/10.5194/se-12-2467-2021, 2021
Short summary
Short summary
The 2 June 1994 Java tsunami earthquake ruptured in a seismically quiet subduction zone and generated a larger-than-expected tsunami. Here, we re-process a seismic line across the rupture area. We show that a subducting seamount is located up-dip of the mainshock in a region that did not rupture during the earthquake. Seamount subduction modulates the topography of the marine forearc and acts as a seismic barrier in the 1994 earthquake rupture.
Steffen Abe and Hagen Deckert
Solid Earth, 12, 2407–2424, https://doi.org/10.5194/se-12-2407-2021, https://doi.org/10.5194/se-12-2407-2021, 2021
Short summary
Short summary
We use numerical simulations and laboratory experiments on rock samples to investigate how stress conditions influence the geometry and roughness of fracture surfaces. The roughness of the surfaces was analyzed in terms of absolute roughness and scaling properties. The results show that the surfaces are self-affine but with different scaling properties between the numerical models and the real rock samples. Results suggest that stress conditions have little influence on the surface roughness.
Chao Deng, Rixiang Zhu, Jianhui Han, Yu Shu, Yuxiang Wu, Kefeng Hou, and Wei Long
Solid Earth, 12, 2327–2350, https://doi.org/10.5194/se-12-2327-2021, https://doi.org/10.5194/se-12-2327-2021, 2021
Short summary
Short summary
This study uses seismic reflection data to interpret the geometric relationship and evolution of intra-basement and rift-related structures in the Enping sag in the northern South China Sea. Our observations suggest the primary control of pre-existing thrust faults is the formation of low-angle normal faults, with possible help from low-friction materials, and the significant role of pre-existing basement thrust faults in fault geometry, paleotopography, and syn-rift stratigraphy of rift basins.
Sonia Yeung, Marnie Forster, Emmanuel Skourtsos, and Gordon Lister
Solid Earth, 12, 2255–2275, https://doi.org/10.5194/se-12-2255-2021, https://doi.org/10.5194/se-12-2255-2021, 2021
Short summary
Short summary
We do not know when the ancient Tethys Ocean lithosphere began to founder, but one clue can be found in subduction accreted tectonic slices, including Gondwanan basement terranes on the island of Ios, Cyclades, Greece. We propose a 250–300 km southwards jump of the subduction megathrust with a period of flat-slab subduction followed by slab break-off. The initiation and its subsequent rollback of a new subduction zone would explain the onset of Oligo–Miocene extension and accompanying magmatism.
Rahul Prabhakaran, Giovanni Bertotti, Janos Urai, and David Smeulders
Solid Earth, 12, 2159–2209, https://doi.org/10.5194/se-12-2159-2021, https://doi.org/10.5194/se-12-2159-2021, 2021
Short summary
Short summary
Rock fractures are organized as networks with spatially varying arrangements. Due to networks' influence on bulk rock behaviour, it is important to quantify network spatial variation. We utilize an approach where fracture networks are treated as spatial graphs. By combining graph similarity measures with clustering techniques, spatial clusters within large-scale fracture networks are identified and organized hierarchically. The method is validated on a dataset with nearly 300 000 fractures.
Olivier Lacombe, Nicolas E. Beaudoin, Guilhem Hoareau, Aurélie Labeur, Christophe Pecheyran, and Jean-Paul Callot
Solid Earth, 12, 2145–2157, https://doi.org/10.5194/se-12-2145-2021, https://doi.org/10.5194/se-12-2145-2021, 2021
Short summary
Short summary
This paper aims to illustrate how the timing and duration of contractional deformation associated with folding in orogenic forelands can be constrained by the dating of brittle mesostructures observed in folded strata. The study combines new and already published absolute ages of fractures to provide, for the first time, an educated discussion about the factors controlling the duration of the sequence of deformation encompassing layer-parallel shortening, fold growth, and late fold tightening.
Vincent Famin, Hugues Raimbourg, Muriel Andreani, and Anne-Marie Boullier
Solid Earth, 12, 2067–2085, https://doi.org/10.5194/se-12-2067-2021, https://doi.org/10.5194/se-12-2067-2021, 2021
Short summary
Short summary
Sediments accumulated in accretionary prisms are deformed by the compression imposed by plate subduction. Here we show that deformation of the sediments transforms some minerals in them. We suggest that these mineral transformations are due to the proliferation of microorganisms boosted by deformation. Deformation-enhanced microbial proliferation may change our view of sedimentary and tectonic processes in subduction zones.
Marta Adamuszek, Dan M. Tămaş, Jessica Barabasch, and Janos L. Urai
Solid Earth, 12, 2041–2065, https://doi.org/10.5194/se-12-2041-2021, https://doi.org/10.5194/se-12-2041-2021, 2021
Short summary
Short summary
We analyse folded multilayer sequences in the Ocnele Mari salt mine (Romania) to gain insight into the long-term rheological behaviour of rock salt. Our results indicate the large role of even a small number of impurities in the rock salt for its effective mechanical behaviour. We demonstrate how the development of folds that occur at various scales can be used to constrain the viscosity ratio in the deformed multilayer sequence.
Cited articles
Abràmoff, M. D., Magalhaes, P. J., and Ram, S. J.: Image Processing with ImageJ, Biophotonics Int., 11, 36–42, 2004.
Allan, J. and Sun, S. Q.: Controls on Recovery Factor in Fractured Reservoirs: Lessons Learned from 100 Fractured Fields, in: All Days, SPE Annual Technical Conference and Exhibition, October 2003, Denver, Colorado, SPE-84590-MS, https://doi.org/10.2118/84590-MS, 2003.
Antonellini, M. and Aydin, A.: Effect of Faulting on Fluid Flow in Porous Sandstones: Petrophysical Properties, AAPG Bull., 78, 355–377, https://doi.org/10.1306/BDFF90AA-1718-11D7-8645000102C1865D, 1994.
Antonellini, M. A., Aydin, A., and Pollard, D. D.: Microstructure of deformation bands in porous sandstones at Arches National Park, Utah, J. Struct. Geol., 16, 941–959, https://doi.org/10.1016/0191-8141(94)90077-9, 1994.
Aydin, A.: Fractures, faults, and hydrocarbon entrapment, migration and fow, Mar. Pet. Geol., 17, 797–814, 2000.
Aydin, A. and Johnson, A. M.: Development of faults as zones of deformation bands and as slip surfaces in sandstone, Pure Appl. Geophys., 116, 931–942, https://doi.org/10.1007/BF00876547, 1978.
Aydin, A., Borja, R. I., and Eichhubl, P.: Geological and mathematical framework for failure modes in granular rock, J. Struct. Geol., 28, 83–98, https://doi.org/10.1016/j.jsg.2005.07.008, 2006.
Bai, T. and Pollard, D. D.: Fracture spacing in layered rocks: a new explanation based on the stress transition, J. Struct. Geol., 22, 43–57, https://doi.org/10.1016/S0191-8141(99)00137-6, 2000.
Bai, T., Pollard, D. D., and Gao, H.: Explanation for fracture spacing in layered materials, Nature, 403, 753–756, https://doi.org/10.1038/35001550, 2000.
Ballas, G., Fossen, H., and Soliva, R.: Factors controlling permeability of cataclastic deformation bands and faults in porous sandstone reservoirs, J. Struct. Geol., 76, 1–21, https://doi.org/10.1016/j.jsg.2015.03.013, 2015.
Barton, C. A., Zoback, M. D., and Moos, D.: Fluid flow along potentially active faults in crystalline rock, Geology, 23, 683–686, https://doi.org/10.1130/0091-7613(1995)023<0683:FFAPAF>2.3.CO;2, 1995.
Barwis, J. H., McPherson, J. G., and Studlick, J. R. J.: Sandstone Petroleum Reservoirs, Springer New York, New York, NY, 583 pp., https://doi.org/10.1007/978-1-4613-8988-0, 1990.
Bear, J.: Dynamics of Fluids in Porous Media, American Elsevier Publishing Co., 764 pp., ISBN 978-0-486-65675-5, 1972.
Berkowitz, B. and Adler, P. M.: Stereological analysis of fracture network structure in geological formations, J. Geophys. Res.-Sol. Ea., 103, 15339–15360, https://doi.org/10.1029/98JB01072, 1998.
Billon, S.: Minéraux argileux dans le gisement uranifère d'Imouraren (Bassin de Tim Mersoï, Niger): Implications sur la genèse du gisement et sur l'optimisation des processus de traitement du minerai, PhD thesis, Univérsité Poitiers, 340 pp., https://theses.fr/2014POIT2263 (last access: July 2024), 2014.
Bisdom, K., Bertotti, G., and Nick, H. M.: The impact of in-situ stress and outcrop-based fracture geometry on hydraulic aperture and upscaled permeability in fractured reservoirs, Tectonophysics, 69, 63–75, https://doi.org/10.1016/j.tecto.2016.04.006, 2016.
Bonnet, E., Bour, O., Odling, N. E., Davy, P., Main, I., Cowie, P., and Berkowitz, B.: Scaling of fracture systems in geological media, Rev. Geophys., 39, 347–383, https://doi.org/10.1029/1999RG000074, 2001.
Caine, J. S., Evans, J. P., and Forster, C. B.: Fault zone architecture and permeability structure, Geology, 24, 1025–1028, https://doi.org/10.1130/0091-7613(1996)024<1025:FZAAPS>2.3.CO;2, 1996.
Carman, P. C.: Fluid flow through granular beds, Inst. Chem. E., 150–166, https://doi.org/10.1016/S0263-8762(97)80003-2, 1937.
Carman, P. C.: Flow of Gases Through Porous Media, Academic Press, New York, 182 pp., https://books.google.fr/books?id=JBxRAAAAMAAJ (last access: July 2024), 1956.
Childs, C., Walsh, J. J., and Watterson, J.: A Method for Estimation of the Density of Fault Displacements below the Limits of Seismic Resolution in Reservoir Formations, in: North Sea Oil and Gas Reservoirs—II, edited by: Buller, A. T., Berg, E., Hjelmeland, O., Kleppe, J., Torsæter, O., and Aasen, J. O., Springer Netherlands, Dordrecht, https://doi.org/10.1007/978-94-009-0791-1_26, 309–318, 1990.
Clauset, A., Shalizi, C. R., and Newman, M. E. J.: Power-Law Distributions in Empirical Data, SIAM Rev., 51, 661–703, https://doi.org/10.1137/070710111, 2009.
Collet, A., Regnault, O., Ozhogin, A., Imantayeva, A., and Garnier, L.: Three-dimensional reactive transport simulation of Uranium in situ recovery: Large-scale well field applications in Shu Saryssu Bassin, Tortkuduk deposit (Kazakhstan), Hydrometallurgy, 211, 105873, https://doi.org/10.1016/j.hydromet.2022.105873, 2022.
Cowie, P. A., Sornette, D., and Vanneste, C.: Multifractal scaling properties of a growing fault population, Geophys. J. Int., 122, 457–469, https://doi.org/10.1111/j.1365-246X.1995.tb07007.x, 1995.
Cox, D. R. and Lewis, P. A. W.: The Statistical Analysis of Series of Events, Springer Netherlands, 285 pp., https://doi.org/10.1007/978-94-011-7801-3, 1966.
Cubitt, J. M., England, W. A., and Larter, S. R. (Eds.): Understanding petroleum reservoirs: towards and integrated reservoir engineering, The Geological Society, London, 395 pp., https://doi.org/10.1144/GSL.SP.2004.237, 2004.
Dershowitz, W. S.: Rock joint systems, PhD thesis, Massachusetts Institute of Technology, 918 pp., http://hdl.handle.net/1721.1/27939 (last access: July 2024), 1984.
Dershowitz, W. S. and Herda, H. H.: Interpretation of fracture spacing and intensity, The 33rd U. S. Symposium on Rock Mechanics (USRMS), Santa Fe, New Mexico, Int. J. Rock Mech. Min., A212, https://doi.org/10.1016/0148-9062(93)91769-F, 1993.
Dichiarante, A. M., McCaffrey, K. J. W., Holdsworth, R. E., Bjørnarå, T. I., and Dempsey, E. D.: Fracture attribute scaling and connectivity in the Devonian Orcadian Basin with implications for geologically equivalent sub-surface fractured reservoirs, Solid Earth, 11, 2221–2244, https://doi.org/10.5194/se-11-2221-2020, 2020.
Doyle, J. D. and Sweet, M. L.: Three-Dimensional Distribution of Lithofacies, Bounding Surfaces, Porosity, and Permeability in a Fluvial Sandstone–Gypsy Sandstone of Northern Oklahoma, AAPG Bull., 79, 70–96, https://doi.org/10.1306/8D2B14BC-171E-11D7-8645000102C1865D, 1995.
Elsayed, M., Isah, A., Hiba, M., Hassan, A., Al-Garadi, K., Mahmoud, M., El-Husseiny, A., and Radwan, A. E.: A review on the applications of nuclear magnetic resonance (NMR) in the oil and gas industry: laboratory and field-scale measurements, J. Pet. Explor. Prod. Technol., 12, 2747–2784, https://doi.org/10.1007/s13202-022-01476-3, 2022.
Evans, D., Stephenson, M., and Shaw, R.: The present and future use of `land' below ground, Land Use Policy, 26, 302–316, https://doi.org/10.1016/j.landusepol.2009.09.015, 2009.
Evans, R. D. and Lekia, S. D. L.: A Reservoir Simulation Study of Naturally Fractured Lenticular Tight Gas Sand Reservoirs, J. Energ. Resour.-ASME, 112, 231–238, https://doi.org/10.1115/1.2905763, 1990.
Fisher, Q. J. and Knipe, R. J.: The permeability of faults within siliciclastic petroleum reservoirs of the North Sea and Norwegian Continental Shelf, Mar. Petrol. Geol., 18, 1063–1081, https://doi.org/10.1016/S0264-8172(01)00042-3, 2001.
Fossen, H., Schultz, R. A., Shipton, Z. K., and Mair, K.: Deformation bands in sandstone: a review, J. Geol. Soc., 164, 755–769, https://doi.org/10.1144/0016-76492006-036, 2007.
Fossen, H., Soliva, R., Ballas, G., Trzaskos, B., Cavalcante, C., and Schultz, R. A.: A review of deformation bands in reservoir sandstones: geometries, mechanisms and distribution, Geol. Soc. Lond. Spec. Publ., 459, 9–33, https://doi.org/10.1144/SP459, 2017.
Gerbeaud, O.: Evolution structurale du bassin de Tim Mersoï: Déformation de la couverture sédimentaire, relations avec la localisation des gisements du secteur d'Arlit (Niger), PhD thesis, Université Paris XI, Orsay, 270 pp., 2006.
Gibling, M. R.: Width and Thickness of Fluvial Channel Bodies and Valley Fills in the Geological Record: A Literature Compilation and Classification, J. Sediment. Res., 76, 731–770, https://doi.org/10.2110/jsr.2006.060, 2006.
Gibson, R. G.: Physical character and fluid-flow properties of sandstone-derived fault zones, Geol. Soc. Lond. Spec. Publ., 127, 83–97, https://doi.org/10.1144/GSL.SP.1998.127.01.07, 1998.
Gillespie, P. A., Walsh, J. J., Watterson, J., Bonson, C. G., and Manzocchi, T.: Scaling relationships of joint and vein arrays from The Burren, Co. Clare, Ireland, J. Struct. Geol., 23, 183–201, https://doi.org/10.1016/S0191-8141(00)00090-0, 2001.
Golsanami, N., Sun, J., and Zhang, Z.: A review on the applications of the nuclear magnetic resonance (NMR) technology for investigating fractures, J. Appl. Geophys., 133, 30–38, https://doi.org/10.1016/j.jappgeo.2016.07.026, 2016.
Goodwin, A. R. H., Pirolli, L., May, E. F., and Marsh, K. N.: Conventional Oil and Gas, in: Future Energy, Elsevier, 19–52, https://doi.org/10.1016/B978-0-08-099424-6.00002-8, 2014.
Guiraud, R., Ousman, B., and Robert, J. P.: Mise en évidence de déformations traduisant un raccourcissement dans le Mésozoïque de la périphérie de l'Aïr (Niger), C. R. Accadémie Sci. Paris, 292, 753–756, 1981.
Harstad, H., Teufel, L. W., and Lorenz, J. C.: Characterization and Simulation of Naturally Fractured Tight Gas Sandstone Reservoirs, in: All Days, SPE Annual Technical Conference and Exhibition, October 1995, Dallas, Texas, SPE-30573-MS, https://doi.org/10.2118/30573-MS, 1995.
Heffer, K. J. and Bevan, T. G.: Scaling Relationships in Natural Fractures: Data, Theory, and Application, in: All Days, European Petroleum Conference, October 1990, the Hague, the Netherlands, SPE-20981-MS, https://doi.org/10.2118/20981-MS, 1990.
Hidajat, I., Mohanty, K. K., Flaum, M., and Hirasaki, G.: Study of Vuggy Carbonates Using NMR and X-Ray CT Scanning, SPE Reserv. Eval. Eng., 7, 365–377, https://doi.org/10.2118/88995-PA, 2004.
Hu, M. S. and Evans, A. G.: The cracking and decohesion of thin films on ductile substrates, Acta Metall., 37, 917–925, https://doi.org/10.1016/0001-6160(89)90018-7, 1989.
Jackson, P. and Sanderson, D. J.: Scaling of fault displacements from the Badajoz-Córdoba shear zone, SW spain, Tectonophysics, 210, 179–190, https://doi.org/10.1016/0040-1951(92)90321-V, 1992.
Jácomo, M., Trindade, R., De Oliveira, E., Leite, C., Montrazi, E., Andreeta, M., and Bonogamba, T.: Nuclear Magnetic Resonance and Pore Coupling in Clay-Coated Sandstones With Anomalous Porosity Preservation, Agua Grande Formation, Reconcavo Basin, Brazil, Petrophysics–SPWLA J. Form. Eval. Reserv. Descr., 59, 136–152, https://doi.org/10.30632/PJV59N2-2018A2, 2018.
Jácomo, M. H., Trindade, R. I. F., Lucas-Oliveira, E., and Bonagamba, T. J.: Magnetic matrix effects on NMR relaxation times in sandstones: A case study in Solimões Basin, J. Appl. Geophys., 179, 104081, https://doi.org/10.1016/j.jappgeo.2020.104081, 2020.
Ji, S., Li, L., and Marcotte, D.: Power-law relationship between joint spacing and bed thickness in sedimentary rocks and implications for layered rock mechanics, J. Struct. Geol., 150, 104413, https://doi.org/10.1016/j.jsg.2021.104413, 2021.
Keller, A. A., Sakthivadivel, R., and Seckler, D. W.: Water scarcity and the role of storage in development, International Water Management Institute, Colombo, Sri Lanka, 2000.
Kozeny, J.: Über kapillare Leitung des Wassers im Boden. (Aufstieg, Versickerung und Anwendung auf die Bewässerung), Sitzungsberichte der Akademie der Wissenschaften mathematisch-naturwissenschaftliche Klasse, 136, 271–306, 1927.
Kruseman, G. P. and de Ridder, N. A.: Analysis and evaluation of pumping test data, 2. edn. (completely rev.), reprint, International Institute for Land Reclamation and Improvement, Wageningen, 377 pp., 2000.
Lee, W. J. and Hopkins, C. W.: Characterization of Tight Reservoirs, J. Petrol. Technol., 46, 956–964, https://doi.org/10.2118/29091-PA, 1994.
Liu, Z., Fu, X., Deng, S., Meng, L., Wang, H., Sun, Y., and Chen, Z.: The critical control of arkosic sandstone porosity on deformation band formation: Insights from the Shulu across-fault borehole in the Bohai Bay Basin, China, J. Struct. Geol., 143, 104258, https://doi.org/10.1016/j.jsg.2020.104258, 2021.
Lucia, F. J.: Carbonate Reservoir Characterization, Springer Berlin Heidelberg, Berlin, Heidelberg, 336 pp., https://doi.org/10.1007/978-3-540-72742-2, 2007.
Mamane Mamadou, M.: Le système métallogénique des gisements d'uranium associés à la faille d'Arlit (Bassin de Tim Mersoï, Niger): diagenèse, circulations des fluides et mécanismes d'enrichissement en métaux (U, Cu, V), PhD thesis, Université Lorraine, 448 pp., https://theses.fr/2016LORR0231 (last access: July 2024), 2016.
Mamane Mamadou, M., Cathelineau, M., Deloule, E., Reisberg, L., Cardon, O., Vallance, J., and Brouand, M.: The Tim Mersoï Basin uranium deposits (Northern Niger): Geochronology and genetic model, Ore Geol. Rev., 145, 104905, https://doi.org/10.1016/j.oregeorev.2022.104905, 2022.
Manzocchi, T.: The connectivity of two-dimensional networks of spatially correlated fractures, Water Resour. Res., 38, 1162, https://doi.org/10.1029/2000WR000180, 2002.
Mauldon, M., Dunne, W. M., and Rohrbaugh, M. B.: Circular scanlines and circular windows: new tools for characterizing the geometry of fracture traces, J. Struct. Geol., 23, 247–258, https://doi.org/10.1016/S0191-8141(00)00094-8, 2001.
Mayolle, S., Soliva, R., Caniven, Y., Wibberley, C., Ballas, G., Milesi, G., and Dominguez, S.: Scaling of fault damage zones in carbonate rocks, J. Struct. Geol., 124, 35–50, https://doi.org/10.1016/j.jsg.2019.03.007, 2019.
Mayolle, S., Soliva, R., Dominguez, S., and Wibberley, C.: Normal fault damage zone growth in map view from analogue models, J. Struct. Geol., 176, 104975, https://doi.org/10.1016/j.jsg.2023.104975, 2023.
Medici, G. and West, L. J.: Review of groundwater flow and contaminant transport modelling approaches for the Sherwood Sandstone aquifer, UK; insights from analogous successions worldwide, Q. J. Eng. Geol. Hydroge., 55, qjegh2021-176, https://doi.org/10.1144/qjegh2021-176, 2022.
Miall, A. D.: Reservoir Heterogeneities in Fluvial Sandstones: Lessons from Outcrop Studies, AAPG Bull., 72, 682–697, https://doi.org/10.1306/703C8F01-1707-11D7-8645000102C1865D, 1988.
Moeck, I. S.: Catalog of geothermal play types based on geologic controls, Renew. Sust. Energ. Rev., 37, 867–882, https://doi.org/10.1016/j.rser.2014.05.032, 2014.
Morad, S., Al-Ramadan, K., Ketzer, J. M., and De Ros, L. F.: The impact of diagenesis on the heterogeneity of sandstone reservoirs: A review of the role of depositional facies and sequence stratigraphy, AAPG Bull., 94, 1267–1309, https://doi.org/10.1306/04211009178, 2010.
Mudd, G.: Critical review of acid in situ leach uranium mining: 1. USA and Australia, Environ. Geol., 41, 390–403, https://doi.org/10.1007/s002540100406, 2001.
Narr, W., Schechter, D. S., and Thompson, L. B.: Naturally Fractured Reservoir Characterization, Society of Petroleum Engineers, https://doi.org/10.2118/9781613999615, 2006.
Nelson, P. H.: Permeability, porosity, and pore-throat size? A three-dimensional perspective, Petrophysics–SPWLA J. Form. Eval. Reserv. Descr., 46, 452–455, 2005.
Nelson, R. A.: Geologic analysis of naturally fractured reservoirs, 2nd Edn., Gulf Professional Pub, Boston, ISBN 978-0-88415-317-7, 2001.
Nichols, G.: Sedimentology and Stratigraphy, second Edn., Wiley Desktop Editions, Wiley, ISBN 978-1-4051-9379-5, 2009.
Northrop, D. A. and Frohne, K.-H.: The Multiwell Experiment – A Field Laboratory in Tight Gas Sandstone Reservoirs, J. Petrol. Technol., 42, 772–779, https://doi.org/10.2118/18286-PA, 1990.
Odling, N. E.: Scaling and connectivity of joint systems in sandstones from western Norway, J. Struct. Geol., 19, 1257–1271, https://doi.org/10.1016/S0191-8141(97)00041-2, 1997.
Odling, N. E., Gillespie, P., Bourgine, B., Castaing, C., Chiles, J. P., Christensen, N. P., Fillion, E., Genter, A., Olsen, C., Thrane, L., Trice, R., Aarseth, E., Walsh, J. J., and Watterson, J.: Variations in fracture system geometry and their implications for fluid flow in fractured hydrocarbon reservoirs, Petrol. Geosci., 5, 373–384, https://doi.org/10.1144/petgeo.5.4.373, 1999.
Odling, N. E., Harris, S. D., and Knipe, R. J.: Permeability scaling properties of fault damage zones in siliclastic rocks, J. Struct. Geol., 26, 1727–1747, https://doi.org/10.1016/j.jsg.2004.02.005, 2004.
Olson, J. E., Laubach, S. E., and Lander, R. H.: Natural fracture characterization in tight gas sandstones: Integrating mechanics and diagenesis, AAPG Bull., 93, 1535–1549, https://doi.org/10.1306/08110909100, 2009.
Ovaskainen, N., Nordbäck, N., Skyttä, P., and Engström, J.: A new subsampling methodology to optimize the characterization of two-dimensional bedrock fracture networks, J. Struct. Geol., 155, 104528, https://doi.org/10.1016/j.jsg.2022.104528, 2022.
Ovaskainen, N., Skyttä, P., Nordbäck, N., and Engström, J.: Detailed investigation of multi-scale fracture networks in glacially abraded crystalline bedrock at Åland Islands, Finland, Solid Earth, 14, 603–624, https://doi.org/10.5194/se-14-603-2023, 2023.
Pagel, M., Cavellec, S., Forbes, P., Gerbaud, O., Vergely, P., Wagani, I., and Mathieu, R.: Uranium deposits in the Arlit area (niger), in: Mineral Deposit Research: Meeting the Global Challenge, edited by: Mao, J. and Bierlein, F. P., Springer, Berlin, Heidelberg, 303–305, https://doi.org/10.1007/3-540-27946-6_79, 2005.
Peacock, D. C. P., Nixon, C. W., Rotevatn, A., Sanderson, D. J., and Zuluaga, L. F.: Glossary of fault and other fracture networks, J. Struct. Geol., 92, 12–29, https://doi.org/10.1016/j.jsg.2016.09.008, 2016.
Philit, S., Soliva, R., Ballas, G., Chemenda, A., and Castilla, R.: Fault surface development and fault rock juxtaposition along deformation band clusters in porous sandstones series, AAPG Bull., 103, 2731–2756, https://doi.org/10.1306/01211917256, 2019.
Pollard, D. D. and Aydin, A.: Progress in understanding jointing over the past century, Geol. Soc. Am. Bull., 100, 1181–1204, https://doi.org/10.1130/0016-7606(1988)100<1181:PIUJOT>2.3.CO;2, 1988.
QGIS Development Team: QGIS Geographic Information System, Open Source Geospatial Foundation Project [software], https://qgis.org/ (last access: July 2024), 2020.
Qi, S., Zheng, B., Wang, Z., Zhao, H., Cui, Z., Huang, T., Guo, S., Fu, L., and Dong, P.: Geological evaluation for the carbon dioxide geological utilization and storage (CGUS) site: A review, Sci. China Earth Sci., 66, 1917–1936, https://doi.org/10.1007/s11430-022-1107-x, 2023.
Rempe, N. T.: Permanent underground repositories for radioactive waste, Prog. Nucl. Energ., 49, 365–374, https://doi.org/10.1016/j.pnucene.2007.04.002, 2007.
Rives, T., Razack, M., Petit, J.-P., and Rawnsley, K. D.: Joint spacing: analogue and numerical simulations, J. Struct. Geol., 14, 925–937, https://doi.org/10.1016/0191-8141(92)90024-Q, 1992.
Sambo, C., Dudun, A., Samuel, S. A., Esenenjor, P., Muhammed, N. S., and Haq, B.: A review on worldwide underground hydrogen storage operating and potential fields, Int. J. Hydrogen. Energ., 47, 22840–22880, https://doi.org/10.1016/j.ijhydene.2022.05.126, 2022.
Sanderson, D. J. and Nixon, C. W.: The use of topology in fracture network characterization, J. Struct. Geol., 72, 55–66, https://doi.org/10.1016/j.jsg.2015.01.005, 2015.
Sanderson, D. J. and Peacock, D. C. P.: Making rose diagrams fit-for-purpose, Earth-Sci. Rev., 201, 103055, https://doi.org/10.1016/j.earscirev.2019.103055, 2020.
Sani, A., Konaté, M., Karimou, D. H., and Wollenberg, P.: Polyphasic tectonic history of the N70° DASA Graben (northern, Niger), Glob. Journal Earth Environ. Sci., 5, 58–72, 2020.
Schön, J.: Physical properties of rocks: fundamentals and principles of petrophysics, 2nd Edn., Elsevier, Amsterdam, the Netherlands, ISBN 978-0-08-100404-3, 2015.
Schueller, S., Braathen, A., Fossen, H., and Tveranger, J.: Spatial distribution of deformation bands in damage zones of extensional faults in porous sandstones: Statistical analysis of field data, J. Struct. Geol., 52, 148–162, https://doi.org/10.1016/j.jsg.2013.03.013, 2013.
Schultz, R. A., Soliva, R., Fossen, H., Okubo, C. H., and Reeves, D. M.: Dependence of displacement–length scaling relations for fractures and deformation bands on the volumetric changes across them, J. Struct. Geol., 30, 1405–1411, https://doi.org/10.1016/j.jsg.2008.08.001, 2008.
Schultz, R. A., Okubo, C. H., and Fossen, H.: Porosity and grain size controls on compaction band formation in Jurassic Navajo Sandstone, Geophys. Res. Lett., 37, L22306, https://doi.org/10.1029/2010GL044909, 2010.
Sempere, T. and Beaudoin, B.: Discontinuites et sequences dans la formation de Tarat (Viseen superieur) et l'unite d'Arlit (Namuro-Westphalien) a Arlit (Niger); evolution sedimentaire, climatique et tectonique de la region au Carbonifere, B. Soc. Geol. Fr., S7-XXVI, 995–1014, https://doi.org/10.2113/gssgfbull.S7-XXVI.6.995, 1984.
Seredkin, M., Zabolotsky, A., and Jeffress, G.: In situ recovery, an alternative to conventional methods of mining: Exploration, resource estimation, environmental issues, project evaluation and economics, Ore Geol. Rev., 79, 500–514, https://doi.org/10.1016/j.oregeorev.2016.06.016, 2016.
Sharifzadeh, M., Aldrich, C., Ericson, E., and Sarmadivaleh, M.: A Methodology for Geomechanical Modelling of In Situ Recovery (ISR) in Fractured Hard Rocks, ISRM International Symposium – 10th Asian Rock Mechanics Symposium, October 2018, Singapore, ISRM-ARMS10-2018-081, ISBN 978-981-11-9003-2, 2018.
Sibson, R. H.: Structural permeability of fluid-driven fault-fracture meshes, J. Struct. Geol., 18, 1031–1042, https://doi.org/10.1016/0191-8141(96)00032-6, 1996.
Soliva, R. and Schultz, R. A.: Distributed and localized faulting in extensional settings: Insight from the North Ethiopian Rift-Afar transition area, Tectonics, 27, TC2003, https://doi.org/10.1029/2007TC002148, 2008.
Soliva, R., Benedicto, A., and Maerten, L.: Spacing and linkage of confined normal faults: Importance of mechanical thickness, J. Geophys. Res.-Sol. Ea., 111, B01402, https://doi.org/10.1029/2004JB003507, 2006.
Soliva, R., Ballas, G., Fossen, H., and Philit, S.: Tectonic regime controls clustering of deformation bands in porous sandstone, Geology, 44, 423–426, https://doi.org/10.1130/G37585.1, 2016.
Sonntag, R., Evans, J. P., La Pointe, P., Deraps, M., Sisley, H., and Richey, D.: Sedimentological controls on the fracture distribution and network development in Mesaverde Group sandstone lithofacies, Uinta Basin, Utah, USA, Geol. Soc. Lond. Spec. Publ., 374, 23–50, https://doi.org/10.1144/SP374.4, 2014.
Strijker, G., Bertotti, G., and Luthi, S. M.: Multi-scale fracture network analysis from an outcrop analogue: A case study from the Cambro-Ordovician clastic succession in Petra, Jordan, Mar. Petrol. Geol., 38, 104–116, https://doi.org/10.1016/j.marpetgeo.2012.07.003, 2012.
Taylor, R., Tindimugaya, C., Barker, J., Macdonald, D., and Kulabako, R.: Convergent Radial Tracing of Viral and Solute Transport in Gneiss Saprolite, Groundwater, 48, 284–294, https://doi.org/10.1111/j.1745-6584.2008.00547.x, 2010.
Terzaghi, R. D.: Sources of Error in Joint Surveys, Géotechnique, 15, 287–304, https://doi.org/10.1680/geot.1965.15.3.287, 1965.
Torabi, A. and Berg, S. S.: Scaling of fault attributes: A review, Mar. Petrol. Geol., 28, 1444–1460, https://doi.org/10.1016/j.marpetgeo.2011.04.003, 2011.
Valsardieu, C.: Cadres géologiques et paléogréographiques des minéaralisations de charbon, de cuivre et d'uranium de la région d'Agadès (République du Niger), PhD thesis, Université de Nice, 752 pp., https://www.sudoc.fr/115693742 (last access: July 2024), 1971.
Walsh, J., Watterson, J., and Yielding, G.: The importance of small-scale faulting in regional extension, Nature, 351, 391–393, 1991.
Warren, J. E. and Root, P. J.: The Behavior of Naturally Fractured Reservoirs, Soc. Petrol. Eng. J., 3, 245–255, https://doi.org/10.2118/426-PA, 1963.
Watkins, H., Bond, C. E., Healy, D., and Butler, R. W. H.: Appraisal of fracture sampling methods and a new workflow to characterise heterogeneous fracture networks at outcrop, J. Struct. Geol., 72, 67–82, https://doi.org/10.1016/j.jsg.2015.02.001, 2015.
Watkins, H., Healy, D., Bond, C. E., and Butler, R. W. H.: Implications of heterogeneous fracture distribution on reservoir quality; an analogue from the Torridon Group sandstone, Moine Thrust Belt, NW Scotland, J. Struct. Geol., 108, 180–197, https://doi.org/10.1016/j.jsg.2017.06.002, 2018.
Watterson, J., Walsh, J. J., Gillespie, P. A., and Easton, S.: Scaling systematics of fault sizes on a large-scale range fault map, J. Struct. Geol., 18, 199–214, 1996.
Wilkins, S. J., Davies, R. K., and Naruk, S. J.: Subsurface observations of deformation bands and their impact on hydrocarbon production within the Holstein Field, Gulf of Mexico, USA, Geol. Soc. Lond. Spec. Publ., 496, 223–252, https://doi.org/10.1144/SP496-2018-139, 2020.
Wong, T. and Baud, P.: The brittle-ductile transition in porous rock: A review, J. Struct. Geol., 44, 25–53, https://doi.org/10.1016/j.jsg.2012.07.010, 2012.
Wong, T., David, C., and Zhu, W.: The transition from brittle faulting to cataclastic flow in porous sandstones: Mechanical deformation, J. Geophys. Res.-Sol. Ea., 102, 3009–3025, https://doi.org/10.1029/96JB03281, 1997.
Wyllie, M. R. J., Gregory, A. R., and Gardner, L. W.: Elastic wave velocities in heterogeneous and porous media, GEOPHYSICS, 21, 41–70, https://doi.org/10.1190/1.1438217, 1956.
Yahaya, M.: Dynamique sédimentaire du Guézouman et des formations viséennes sous-jacentes en liaison avec la tectonique, le volcanisme et le climat, paléomilieux des gîtes uranifères d'Arlit (Niger), PhD thesis, Université de Bourgogne, 357 pp., https://theses.fr/1992DIJOS053 (last access: July 2024), 1992.
Yahaya, M. and Lang, J.: Évolution tectono-sédimentaire de l'unité d'Akokan au cours du Viséen dans le bassin de Tim Mersoï (région d'Arlit, Niger), J. Afr. Earth Sci., 31, 415–431, https://doi.org/10.1016/S0899-5362(00)00097-X, 2000.
Yielding, G., Needham, T., and Jones, H.: Sampling of fault populations using sub-surface data: a review, J. Struct. Geol., 18, 135–146, https://doi.org/10.1016/S0191-8141(96)80039-3, 1996.
Yielding, G., Freeman, B., and Needham, D. T.: Quantitative Fault Seal Prediction, AAPG Bull., 81, 897–917, https://doi.org/10.1306/522B498D-1727-11D7-8645000102C1865D, 1997.
Zemanek, J., Glenn, E. E., Norton, L. J., and Caldwell, R. L.: Formation evaluation by inspection with borehole televiewer, GEOPHYSICS, 35, 254–269, https://doi.org/10.1190/1.1440089, 1970.
Short summary
This study characterizes the Tchirezrine II sandstone reservoir in northern Niger. Crucial for potential uranium in situ recovery (ISR), our multifaceted approach reveals (i) a network of homogeneously distributed orthogonal structures, (ii) the impact of clustered E–W fault structures on anisotropic fluid flow, and (iii) local changes in the matrix behaviour of the reservoir as a function of the density and nature of the deformation structure.
This study characterizes the Tchirezrine II sandstone reservoir in northern Niger. Crucial for...
