气候变化领域集成服务门户(CCPortal): Experimental Reactivation of Shear-fractured Berea and Boise Sandstones by Brine or Liquid CO2 Injection at Depth

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DOI	10.1029/2019JB018281
	Experimental Reactivation of Shear-fractured Berea and Boise Sandstones by Brine or Liquid CO2 Injection at Depth
	Velcin H.; Dautriat J.; Sarout J.; Esteban L.; Godel B.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	Injection-driven reactivation of fractured/faulted reservoirs is a key concern in the design and safe operation of water/CO2 injection projects. Here, a new laboratory testing protocol is devised by which the reactivation conditions are quantified, providing pivotal data for effective risk assessment/management. We simulate a field injection operation in the laboratory on prefaulted Berea and Boise sandstones subjected to stress/pressure conditions prevalent at 2 km depth. The protocol consists of two key stages: (i) drained normal faulting: triaxial shear failure induced by increase of the overburden stress; and (ii) injection-driven reactivation of the faulted rock by pore pressure increase. Injection is conducted with either brine or liquid CO2. The data show that at 2 km depth, (i) shear fracturing and subsequent faulting occurs when the differential stress reaches 36–46 MPa for Boise, or 96–98 MPa for Berea, and (ii) subsequent reactivation triggers when the pore fluid over-pressure reaches 4–5 MPa, regardless of the injected fluid or specific sandstone tested. Spatiotemporal monitoring of the concomitant microseismic activity proves effective in time-lapse imaging the structural changes leading to the triaxial faulting of the intact rock, or to the reactivation of the prefaulted rock. Microseismic imaging suggests that (i) initial shear faulting results in a single slip surface, consistent with brittle (Berea) or semibrittle (Boise) failure; (ii) upon injection-induced reactivation at 2 km depth, the preexisting fault ruptures and slips first, before a new and steeper fracture nucleates, progressively propagates, then slips; and (iii) dynamic slip transfer occurs from the preexisting to the newly formed fault. © 2020 Commonwealth of Australia
英文关键词	fault reactivation; fluid injection; induced seismicity; laboratory simulation; microseismic imaging; triaxial stress
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187956
作者单位	Rock Properties Team, CSIRO Energy, Perth, WA, Australia; Geomechanics and Geophysics Laboratory, CSIRO Energy, Perth, WA, Australia; Now at University of Western Australia, Perth, WA, Australia; Petrophysics and Geophysics Team, CSIRO Energy, Perth, WA, Australia; 3D Characterisation and Chemical Analysis Team, CSIRO Mineral Resources, Perth, WA, Australia
推荐引用方式 GB/T 7714	Velcin H.,Dautriat J.,Sarout J.,et al. Experimental Reactivation of Shear-fractured Berea and Boise Sandstones by Brine or Liquid CO2 Injection at Depth[J],2020,125(2).
APA	Velcin H.,Dautriat J.,Sarout J.,Esteban L.,&Godel B..(2020).Experimental Reactivation of Shear-fractured Berea and Boise Sandstones by Brine or Liquid CO2 Injection at Depth.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Velcin H.,et al."Experimental Reactivation of Shear-fractured Berea and Boise Sandstones by Brine or Liquid CO2 Injection at Depth".Journal of Geophysical Research: Solid Earth 125.2(2020).