文献类型：期刊文章

作　　者：田迎春[1] 马坚伟[1] 杨慧珠[1]

机构地区：[1]清华大学航天航空学院地震波勘探开发研究所,北京100084

出　　处：《Applied Geophysics》

基　　金：supported by the 973 Program (Grant No.2007CB209505);the National Natural Science Foundation of China (Grant No.40674061,40704019)

年　　份：2010

卷　　号：7

期　　号：1

起止页码：57-65

语　　种：中文

收录情况：AJ、CSA、CSA-PROQEUST、CSCD、CSCD2011_2012、EBSCO、GEOREFPREVIEWDATABASE、IC、INSPEC、JST、PA、PROQUEST、SCI(收录号：WOS:000276505100007)、SCI-EXPANDED(收录号：WOS:000276505100007)、SCIE、SCOPUS、WOS、普通刊

摘　　要：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.

关 键 词：porous medium  immiscible fluids  capillary pressure  finite element method  wavefield simulation  

分 类 号：P631.4]