Abstract
B-35 STRESSDEPENDENCESOFSEISMIC VELOCITIESINPOROUSANDFRACTURED ROCKS SergeA.Shapiro 1 andVladimirN.Troyan² 1 FreieUniversitatBerlin FachrichtungGeophysik Malteserstr.74 -100 12249Berlin Germany ²St.PetersburgStateUni versity Russia Summary EAGE64thConference&Exhibition —Florence Italy 27 -30May2002 1 Using quite general results of the poroelasticity theory we analyze the influence of the confining stress and of the pore pressure on seismic velocities in rocks. In the first approximation the seismic velocities as well as the porosity depend on the differential stress. We show that the stress dependence of the elastic moduli is controlled by the stress dependence of the porosity. The most important role is played by the compliant porosity which can be just
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