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《应用地球物理(英文版)》 2010-01
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Wavefield simulation in porous media saturated with two immiscible fluids

Tian Ying-Chun1,Ma Jian-Wei1,and Yang Hui-Zhu1 1.Institute of seismic exploration,School of Aerospace,Tsinghua University,Beijing 100084,China.  
Wavefields in porous media saturated by two immiscible fluids are simulated in this paper.Based on the sealed system theory,the medium model considers both the relative motion between the fluids and the solid skeleton and the relaxation mechanisms of porosity and saturation(capillary pressure).So it accurately simulates the numerical attenuation property of the wavefields and is much closer to actual earth media in exploration than the equivalent liquid model and the unsaturated porous medium model on the basis of open system theory.The velocity and attenuation for different wave modes in this medium have been discussed in previous literature but studies of the complete wave-field have not been reported.In our work,wave equations with the relaxation mechanisms of capillary pressure and the porosity are derived.Furthermore,the wavefield and its characteristics are studied using the numerical finite element method.The results show that the slow P3-wave in the non-wetting phase can be observed clearly in the seismic band.The relaxation of capillary pressure and the porosity greatly affect the displacement of the non-wetting phase.More specifically,the displacement decreases with increasing relaxation coefficient.
【Fund】: supported by the 973 Program (Grant No.2007CB209505);; the National Natural Science Foundation of China (Grant No.40674061 40704019)
【CateGory Index】: P631.4
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