Permeability Evolution During Shear Zone Initiation in Low-Porosity Rocks
نویسندگان
چکیده
Abstract Using an innovative experimental set-up (Punch-Through Shear test), we initiated a shear zone (microfault) in Flechtingen sandstone and Odenwald granite under situ reservoir conditions while monitoring permeability fracture dilation evolution. The zone, which has cylindrical geometry, is produced by self-designed piston assembly that punches down the inner part of sample. Permeability were measured for entire duration experiment. After generation, imposed displacement was increased to 1.2 mm pore pressure changes $$\pm 5$$ ± 5 or 10$$ 10 MPa applied cyclically simulate injection production scenarios. Thin sections image analysis tools used identify microstructural features zone. geometry shown follow self-affine scaling invariance, similar surface roughness. evolution related onset different both rocks: almost no enhancement increase more than 2 orders magnitude granite. Further resulted slight permeability. A fault compaction observed after relaxation associated decrease factor 3. during cycling are reversible when varying effective pressure. difference between larger width zones.
منابع مشابه
Effect of Cracks on Elastic Properties of Low Porosity Rocks
Effect of Cracks on Elastic Properties of Low Porosity Rocks by Terrence Patrick Todd Submitted to the Department of Earth and Planetary Sciences on May 1, 1973, in partial fulfillment of the requirements for the degree of Doctor of Philosophy Microcracks in terrestrial and lunar rocks significantly alter elastic, thermal, and mechanical properties. The degree to which microcracks alter physica...
متن کاملPermeability and Relative Permeability in Rocks
Important features of the topology of the pore space of rocks can be usefully quantiied by analyzing digitized images of rock cross sections. One approach computes statistical correlation functions using modern image processing techniques. These correlation functions contain information about porosity, speciic surface area, tortuosity, formation factor, and elastic constants, as well as the uid...
متن کاملEffect of Glauconite on the Elastic Properties, Porosity, and Permeability of Reservoirs Rocks
متن کامل
Laboratory experiments simulating poroelastic stress changes associated with depletion and injection in low-porosity sedimentary rocks
We characterized the poroelastic deformation of six cores from three formations associated with the Bakken play in the Williston Basin (the Lodgepole, Middle Bakken, and Three Forks formations). All are low-porosity, low-permeability formations, but vary considerably in clay, kerogen, and carbonate content. The experimental program simulated reservoir stress changes associated with depletion an...
متن کاملAcoustic Double Refraction in Low-porosity Rocks by Terry Todd, Gene Simmons, and W. Scott Baldridge
Anisotropy in physical properties of rocks can arise from preferred mineral orientation, mineral layering, nonhydrostatic stress, and anisotropic crack distribution. For instance, all of the following cause acoustic double refraction: preferential orientation of olivine grains in dunites, alternating layers in laboratory-sizedsamples of such mineral pairs as olivine-feldspar, wollastonite-diops...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Rock Mechanics and Rock Engineering
سال: 2021
ISSN: ['0723-2632', '1434-453X']
DOI: https://doi.org/10.1007/s00603-020-02356-0