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Permeability of rock samples from Cajon Pass, California

1988; American Geophysical Union; Volume: 15; Issue: 9 Linguagem: Inglês

10.1029/gl015i009p01033

1944-8007

C. A. Morrow, J. D. Byerlee,

Rock Mechanics and Modeling

Room temperature, steady‐state flow measurements of permeability were conducted on 15 unfractured core samples collected at depths between 270 and 2100 m in the Cajon Pass drillhole. Confining and pore pressures were set to the lithostat and hydrostat for each depth. The first 500 m encountered in the drill hole is composed of sandstones with typically high permeabilities of around 10 −17 m². The crystalline rocks between 500 and 2100 m show a systematic decrease in permeability with depth from 10 −19 to less than 10 −21 m². These values are particularly low relative to the applied effective stresses of only 10‐30 MPa, and may be a result of the extensive crack healing that was observed in most samples.