Saturation, pore pressure and effective stress from sandstone acoustic properties

Details Saturation, pore pressure and effective stress from sandstone acoustic properties Saturation, pore pressure and effective stress from sandstone acoustic properties

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30b..61s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 2, pp. 61-1, CiteID 1089, DOI 10.1029/2002GL016143

Physics

7

Physical Properties Of Rocks: Acoustic Properties, Physical Properties Of Rocks: Instruments And Techniques, Physical Properties Of Rocks: Microstructure, Physical Properties Of Rocks: Permeability And Porosity, Physical Properties Of Rocks: Fracture And Flow

Scientific paper

Acoustic velocity and Vp/Vs ratio show different responses in saturated and dry rocks under increasing differential pressures. Velocity is also shown to be sensitive to pore pressure, not just differential pressure. Under identical low differential pressure conditions, velocity is higher in sandstones when pore pressure is high during simulation of inflationary overpressure conditions. Vp/Vs ratios of sandstones with high fluid pressures are shown to lie between dry conditions and saturated conditions with constant and low pore pressure. Thus the velocity-differential pressure relationship is not unique. However, the use of the measured Biot effective stress coefficient results in a unique relationship. It is postulated that higher velocity and different Vp/Vs ratios are caused by loss of compliance in microfractures due to stiffening by increasing fluid pressure.

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