Fracturing of dry porous rock by fluid injection

S. Stanchits, S. Mayr, S. Shapiro, G. Dresen

Research output: Contribution to conferencePaperpeer-review

Abstract

We studied fracturing of rock samples induced by water injection in axial compression tests on cylindrical specimens of Flechtingen sandstone by means of advanced acoustic emission (AE) technique. Injection of water into stressed dry sandstone induced appearance and diffusion of AE cloud, and later increase of pore pressure led to shear fracture of the rock. Ultrasonic velocity measurements and direct measurements of injected volume confirmed close relation of the water front position with the tip of induced AE cloud. Propagation of induced AE parallel to bedding plane is faster than perpendicular to bedding and related to anisotropy of permeability. Initial increase of pore pressure shows significant increase of tensile type of AE events, while approaching failure both shear and pore collapse types of AE events became dominant. Microstructural analysis of fractured samples shows excellent agreement between location of AE hypocenters and the faults. Results of presented researches could be applied for the interpretation of field microseismic data registered during monitoring of borehole fluid injections, for example, used for stimulations in hydrocarbon or geothermal reservoirs.

Original languageEnglish
Publication statusPublished - 2010
Externally publishedYes
Event44th US Rock Mechanics Symposium and the 5th US/Canada Rock Mechanics Symposium - Salt Lake City, UT, United States
Duration: 27 Jun 201030 Jun 2010

Conference

Conference44th US Rock Mechanics Symposium and the 5th US/Canada Rock Mechanics Symposium
Country/TerritoryUnited States
CitySalt Lake City, UT
Period27/06/1030/06/10

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