Quartz grain fracturing, crack healing, and stress-induced Dauphiné twinning are equally developed in the 20 cores, with the only measurable effect of gas production being enhanced microcracking of sparse K-feldspar grains in the 2015 core. Whether compaction is elastic or partly inelastic, as implied by recent experiments, is key to forecasting system behavior and seismic hazard.īart Verberne and colleagues sought evidence for a role of inelastic deformation through comparative microstructural analysis of unique drill-core, recovered from the seismogenic center of the field in 2015, 50 years after gas production started, versus core recovered before production (1965). ![]() Verberne.īoulder, Colo., USA: Europe's largest gas field, the Groningen field in the Netherlands, is widely known for induced subsidence and seismicity caused by gas pressure depletion and associated compaction of the sandstone reservoir. ![]() view moreĬredit: Microstructures were obtained by B.A. Compaction and shear of these thin clay films has played a key role in controlling compaction of the Groningen gas reservoir to date. Image: A sectioned quartz-quartz grain contact revealing a thin clay film (ribbon-like structure).
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