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Data Publication
Friction and compaction data of simulated fault gouges derived from the Basal Zechstein caprock of the Groningen gas field
Hunfeld, Luuk Bernd
YoDa Data Repository, Utrecht University, Netherlands
(2019)
We investigated the rate-and-state frictional properties of simulated anhydrite-carbonate faultspan> gouge derived from the Basal Zechstein caprock overlying the seismogenic Groningen gas reservoir in the NE Netherlands. Direct shear experiments were performed at in-situ conditions of 50-150 °C and 40 MPa effective normal stress, using sliding velocities of 0.1-10 µm/s. Reservoir pore fluid compositions were simulated using 4.4 Molar NaCl brine, as well as methane, air and brine/gas mixtures. Brine-saturated samples showed friction coefficients (µ) of 0.60-0.69, with little dependence on temperature, along with velocity-strengthening at 50-100 °C, transitioning to velocity-weakening at 120 °C and above. By contrast, gas-filled, evacuated and partially brine-saturated samples showed µ values of 0.72±0.02 plus strongly velocity-weakening behaviour accompanied by stick-slip at 100 °C (the only temperature investigated for gas-bearing and dry samples). A microphysical model for gouge friction, assuming competition between dilatant granular flow and thermally-activated compaction creep, captures the main trends seen in our brine-saturated samples but offers only a qualitative explanation for our gas-bearing and dry samples. Since the reservoir temperature is ~100 °C, our results imply that faults cross-cutting the Basal Zechstein caprock and juxtaposing the caprock against the reservoir sandstone may show strongly velocity-weakening behaviour, specifically in the gas-filled upper portion of the reservoir/caprock system. From a RSF point of view, these faults thus have an increased potential for nucleating seismogenic slip in comparison with faults in the underlying formations. The data is provided in a folder with 15 subfolders for 15 experiments/samples. Detailed information about the files in these subfolders as well as information on how the data is processed is given in the explanatory file Hunfeld-et-al-2019-Data-Description.pdf. Contact person is Luuk Hunfeld - PhD student - l.b.hunfeld@uu.nl
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Source publisher
YoDa Data Repository, Utrecht University, Netherlands
DOI
10.24416/UU01-PLO6JQ
Authors
Hunfeld, Luuk Bernd
Utrecht University;
Contributers
Chen, Jianye
Researcher
0000-0002-5973-5293
Utrecht University;
Niemeijer, André Rik
Supervisor
0000-0003-3983-9308
Utrecht University;
Spiers, Christopher James
ProjectLeader
0000-0002-3436-8941
Utrecht University;
Pressure and Temperature Laboratory, High
HostingInstitution
Utrecht University;
Hunfeld, Luuk Bernd
ContactPerson
Utrecht University;
Contact
Hunfeld, Luuk Bernd
Utrecht University;
Citiation
Hunfeld, L. B. (2019). Friction and compaction data of simulated fault gouges derived from the Basal Zechstein caprock of the Groningen gas field. Utrecht University. https://doi.org/10.24416/UU01-PLO6JQ
Collection Period
2015-01-01 - 2018-11-23
Geo location(s)
53.34725832, 6.73938985
Location of the ZRP-2 well in the Groningen gas field