Articles | Volume 11, issue 3
Research article
07 May 2020
Research article |  | 07 May 2020

Characteristics of a fracture network surrounding a hydrothermally altered shear zone from geophysical borehole logs

Eva Caspari, Andrew Greenwood, Ludovic Baron, Daniel Egli, Enea Toschini, Kaiyan Hu, and Klaus Holliger

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Cited articles

Ahlbom, K., Smeallie, J., Tirén, S., Andersson, J.-E., Ekman, L., Nordquist, R., Wikberg, P., Andersson, P., and Gustafsson, E.: Characterization of fracture zone 2, Finnsjön study-site, SKB Technical Report 89-19, Tech. rep., Svensk Kärnbränslehantering AB, Swedish Nuclear Fuel and Waste Management Co., 1989. a
Arthur, D. and Vassilvitskii, S.: k-means++: The advantages of careful seeding, in: Proceedings of the eighteenth annual ACM-SIAM symposium on Discrete algorithms, 1027–1035, Society for Industrial and Applied Mathematics, 2007. a
Barbosa, N. D., Caspari, E., Rubino, J. G., Greenwood, A., Baron, L., and Holliger, K.: Estimation of fracture compliance from attenuation and velocity analysis of full-waveform sonic log data, J. Geophys. Res.-Sol. Ea., 124, 2738–2761, 2019. a
Barton, C. A., Zoback, M. D., and Moos, D.: Fluid flow along potentially active faults in crystalline rock, Geology, 23, 683–686, 1995. a, b
Belgrano, T. M., Herwegh, M., and Berger, A.: Inherited structural controls on fault geometry, architecture and hydrothermal activity: an example from Grimsel Pass, Switzerland, Swiss J. Geosci., 109, 345–364, 2016. a, b, c, d, e, f
Short summary
A shallow borehole was drilled to explore the petrophysical and hydraulic characteristics of a hydrothermally active fault in the crystalline Aar massif of the Alps. A key objective of studying surficial features of this kind is to establish analogies with natural and deep-seated engineered hydrothermal systems. A wide range of geophysical borehole logs was acquired, which revealed a complex fracture network in the damage zone of the fault and a related compartmentalized hydraulic behavior.