Overpressure detection from compressional- and shear-wave data

Details Overpressure detection from compressional- and shear-wave data Overpressure detection from compressional- and shear-wave data

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3417d&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 22, p. 3417-3420

Physics

18

Physical Properties Of Rocks: Acoustic Properties

Scientific paper

By analyzing experimental data we show that in many room-dry rocks, the Poisson's ratio (PR) decreases with decreasing differential pressure (confining minus pore pressure). This means that in gas-saturated rocks, PR decreases with increasing pore pressure. We confirm the generality of the observed effect by theoretically reproducing it via effective medium modeling. This effect can be used as a new tool for overpressure detection from surface seismic, cross-well, sonic logs and measurements ahead of the drill bit.

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