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The Research of Rock Poroelasticity

SHI\ Ge (Department of Geology,Peking University,Beijing,100871) YANG Dongquan\ YANG Huizhu (Department of Engineering Mechanics of Tsinghua University,Beijing,100084)  
The relation between poroelastic modulus and effective modulus of rock under dry and fluid\|saturated conditions was discussed in this paper.The poroelastic modulus could describe pore effect on elastic behavior of porous media such as rocks.From this,Gassmann equation which was widely used in seismic exploration and petroleum logging was deduced.This equation was based on linear elasticity assumption and could be used only within low frequency.The accurate formula of computing effective pressure was pointed out also.The method was proposed to compute the rock modulus when one kind of pore fluid changed to another,and to identify the pore fluids by the use of poroelastic modulus.
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