Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..881l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, May 1991, p. 881-884.
Physics
8
Drilling, Earth Core, Geophysical Fluids, Pressure Measurement, Wells, Crack Propagation, High Pressure, Permeability, Pressure Dependence, Stress Relieving
Scientific paper
The constant flow-rate permeability measurements of samples taken from a 12-km-deep well are reported. All samples are shown to have an extreme pressure sensitivity of permeability, attributed to stress-relief microcrack damage during coring and sample decompression. The pressure dependence of permeability, resistivity, and crack porosity is analyzed through an equivalent-channel-model analysis, and it is demonstrated that the data appear consistent with either an in situ pore pressure exceeding the hydrostat by as much as 100 MPa or a hydrostatic pressure and sublithostatic in situ vertical stress. It is demonstrated that the equivalent-channel model in conjunction with permeability and resistivity measurements might be used to distinguish between the effects of stress-relief cracking and those of in situ microcracks.
Hickman Stephen
Kuksenko V.
Lockner David
Ponomarev A.
Sidorin A.
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