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Data Publication
Frictional healing data from direct shear slide-hold-slide experiments performed on simulated fault gouges from the Groningen gas field
Hunfeld, Luuk Bernd
YoDa Data Repository, Utrecht University, Netherlands
(2020)
We investigated the frictional strength recovery (healing) and subsequent reactivation and slip-weakening behaviour of simulated fault gouges derived from key stratigraphic units in the seismogenic Groningen gas field (N.E. Netherlands). Direct-shear, Slide-Hold-Slide (SHS) experiments were performed at in-situ conditions of 100 °C, 40 MPa effective normal stress and 10-15 MPa pore fluid pressure (synthetic formation brine). Sheared gouges were allowed to heal for periods up to 100 days before subsequent re-shearing. The initial coefficient of (steady) sliding friction μ was highest in the Basal Zechstein caprock (μ=0.65±0.02) and Slochteren sandstone reservoir (μ=0.61±0.02) gouges, and the lowest in the Ten Boer claystone at the reservoir top (μ=0.38±0.01) and in the Carboniferous shale substrate (μ≈0.45). Healing and subsequent reactivation led to a marked increase (Δμ) in (static) friction coefficient of up to ~0.16 in Basal Zechstein and ~0.07 in Slochteren sandstone gouges for the longest hold periods investigated, followed by a sharp strength drop (up to ~25%) and slip-weakening trajectory. By contrast, the Ten Boer and Carboniferous gouges showed virtually no healing or strength drop. Healing rates in the Basal Zechstein and Slochteren sandstone gouges were significantly affected by the stiffness of different machines used, in line with the Ruina slip law, and with a microphysical model for gouge healing. Our results point to marked stratigraphic variation in healed frictional strength and healing rate of faults in the Groningen system, and high seismogenic potential of healed faults cutting the reservoir and Basal Zechstein caprock units, upon reactivation. The data is provided in a folder with 19 subfolders for 19 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_2020_Data_Explanation.pdf. Contact person is Luuk Hunfeld - PhD student - l.b.hunfeld@uu.nl
Keywords
Originally assigned keywords
Corresponding MSL vocabulary keywords
MSL enriched keywords
MSL original sub domains
MSL enriched sub domains i
Source publisher
YoDa Data Repository, Utrecht University, Netherlands
DOI
10.24416/UU01-RHTSV4
Authors
Hunfeld, Luuk Bernd
0000-0001-9250-414X
Utrecht University;
Contributers
Hunfeld, Luuk Bernd
DataCollector
0000-0001-9250-414X
Utrecht University;
Hunfeld, Luuk Bernd
ContactPerson
0000-0001-9250-414X
Utrecht University;
Chen, Jianye
Researcher
0000-0002-5973-5293
Utrecht University; Technical University of Delft;
Hol, Sander
Supervisor
0000-0001-8040-618X
Shell Global Solutions International B.V.;
Niemeijer, André Rik
Supervisor
0000-0003-3983-9308
Utrecht University;
Spiers, Christopher James
ProjectLeader
0000-0002-3436-8941
Utrecht University;
Experimental rock deformation/HPT-Lab (Utrecht University, The Netherlands)
HostingInstitution
Utrecht University;
Contact
Experimental rock deformation/HPT-Lab (Utrecht University, The Netherlands)
Utrecht University;
Citiation
Hunfeld, L. B. (2020). Frictional healing data from direct shear slide-hold-slide experiments performed on simulated fault gouges from the Groningen gas field. Utrecht University. https://doi.org/10.24416/UU01-RHTSV4
Geo location(s)
Stedum 1 (SDM-1) wells - Groningen
Zeerijp 2 (ZRP-2) wells - Groningen