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.

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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