Wireline distributed acoustic sensing allows 4.2&thinsp;km deep vertical seismic profiling of the Rotliegend 150&thinsp;°C geothermal reservoir in the North German Basin

Henninges, Jan; Martuganova, Evgeniia; Stiller, Manfred; Norden, Ben; Krawczyk, Charlotte M.

doi:https://doi.org/10.5194/se-12-521-2021

Articles | Volume 12, issue 2

https://doi.org/10.5194/se-12-521-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Fibre-optic sensing in Earth sciences

https://doi.org/10.5194/se-12-521-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 12, issue 2

Research article

|

25 Feb 2021

Research article |

| 25 Feb 2021

Wireline distributed acoustic sensing allows 4.2 km deep vertical seismic profiling of the Rotliegend 150 °C geothermal reservoir in the North German Basin

Jan Henninges, Evgeniia Martuganova, Manfred Stiller, Ben Norden, and Charlotte M. Krawczyk

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Final revised paper (published on 25 Feb 2021)
Preprint (discussion started on 12 Oct 2020)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Review - Henninges et al.', Anonymous Referee #1, 16 Oct 2020
- AC1: 'Author response to interactive comment by Anonymous Referee #1', Jan Henninges, 21 Dec 2020
RC2: 'SE-2020-169 Review', Ariel Lellouch, 20 Oct 2020
- AC2: 'Author response to interactive comment by Ariel Lellouch (Referee #2)', Jan Henninges, 21 Dec 2020

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Jan Henninges on behalf of the Authors (21 Dec 2020) Author's response Manuscript

ED: Referee Nomination & Report Request started (26 Dec 2020) by Zack Spica

RR by Ariel Lellouch (29 Dec 2020)

Suggestions for revision or reasons for rejection

Thank you for addressing the comments from the previous round of review. I think the paper now reads very well and is practically ready for publication. Therefore, I only list technical/proof-reading comments hoping they aren’t overly tedious. I also wish to apologize for my obscure wording in the comment about the resolution compared to the sonic log, but your answer was nonetheless to the point, so it didn’t affect the review process.

1) I think it would be useful to mention the multi-gauge length recording property of hDVS.
2) I don’t know about Solid Earth’s policy, but it is worth checking if papers under review/preparation can be referenced.
3) I’d be very interested in reading alternative theories on why the SNR patterns changed throughout the experiment (if they exist).
4) The link to the data isn’t working for me.

Line 32 >> Stay consistent between geophone chain (abstract) and string (here). I prefer string
Line 47 >> Within *the* two research wells existing at the site (since you already mentioned them)
Line 50 >> I’d explicitly state that this formation is the target of the study.
Line 62 >> “For this wireline deployment method nevertheless only very few experiences exist until now” – I think the phrasing is slightly off, consider rewriting
Line 67 >> I think “as well” should be “and” because of the comma preceding it
Line 95 (and others) >> I think that “DAS data were” is better than “DAS data was”
Line 114 >> “mainly data for well GrSk3 could only be recorded during this time.” – remove “only” or rephrase
Line 127 >> “signal-to-noise ratio, while keeping” – unnecessary comma
Line 131 >> Emphasize that it is the apparent velocity (ZO case)
Line 174 >> “to be distinguished” -> to distinguish
Line 186 >> “acoustic receivers” is ambiguous, maybe “recording elements” instead?
Line 225 >> “The energy of signal and noise was computed” – should be in plural form
Line 282 >> “and correlated are at or close to” – the “are” is redundant
Line 331 >> “Based on this survey, several important new experiences” – maybe “lessons” works better?
Line 365 >> can therefore not -> can not therefore

All the best and happy new year,

Ariel Lellouch
Stanford U.

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ED: Publish subject to minor revisions (review by editor) (30 Dec 2020) by Zack Spica

AR by Jan Henninges on behalf of the Authors (06 Jan 2021) Author's response Author's tracked changes Manuscript

ED: Publish as is (11 Jan 2021) by Zack Spica

ED: Publish as is (11 Jan 2021) by Susanne Buiter (Executive editor)

AR by Jan Henninges on behalf of the Authors (15 Jan 2021)

Short summary

We performed a seismic survey in two 4.3 km deep geothermal research wells using the novel method of distributed acoustic sensing and wireline cables. The characteristics of the acquired data, methods for data processing and quality improvement, and interpretations on the geometry and structure of the sedimentary and volcanic reservoir rocks are presented. The method enables measurements at high temperatures and reduced cost compared to conventional sensors.