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Data Publication
Mechanical and microstructural data used in: “The effect of strain rate on inelastic strain development in porous sandstones deformed under reservoir conditions”
Shinohara, Takahiro
YoDa Data Repository, Utrecht University, Netherlands
(2024)
Subsurface human activities, such as fluid extraction from oil or gas sandstone reservoirs, frequently leads to surface subsidence and even induced seismicity, as observed in the Groningen Gas Field, the Netherlands. Subsidence is caused by elastic and inelastic reservoir compaction at depth resulting from the increase in effective stress due to pore pressure reduction. The inelastic compaction is partly caused by rate- or time-dependent processes, meaning that compaction may continue even if production is stopped. To reliably evaluate the impact of post-abandonment behavior, mechanism-based rate-/time-dependent compaction laws are needed. We performed constant strain rate (rates of 10-3-10-8 s-1) and strain rate stepping (rates varying between 10-4 and 10-9 s-1) experiments under conventional triaxial conditions, on highly porous, clay-bearing Bleurswiller (as an analogue of the Groningen reservoir sandstone) and almost clay-free Bentheimer sandstones. Our results showed a systematic rate effect at differential stresses exceeding 40-50% of the peak differential stress in Bleurswiller sandstone, while this rate effect was only observed at differential stresses exceeding 70% of the peak differential stress in Bentheimer sandstone. Additional experiments investigating the effect of confining pressure, temperature and pore fluid pH, and microstructural analyses on undeformed and deformed materials, suggest that the observed rate effects are likely controlled by rate-dependent intergranular frictional sliding at lower differential stress, with an increased role of stress corrosion cracking at higher differential stress. The data provided in this dataset include mechanical and microstructural data obtained on our Bleurswiller and Bentheimer sandstone samples. The mechanical data were obtained from 24 conventional triaxial compression experiments at constant strain rate. The microstructural data include backscatter electron (BSE) images obtained for one undeformed sample and two deformed samples, and electron dispersive X-ray spectrometry (EDX) element maps on an undeformed sample.
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Source publisher
YoDa Data Repository, Utrecht University, Netherlands
DOI
10.24416/uu01-prmutt
Authors
Shinohara, Takahiro
Utrecht University;
Citiation
Shinohara, T. (2024). Mechanical and microstructural data used in: “The effect of strain rate on inelastic strain development in porous sandstones deformed under reservoir conditions” (Version 1.0) [Data set]. Utrecht University. https://doi.org/10.24416/UU01-PRMUTT
Collection Period
2021-09-29 - 2023-05-31