饱和流体多孔隙介质反射率法全波场模拟  

The full-wave field simulation in saturated porous media using the reflectivity method

作　　者：张营革[1] 

机构地区：[1]胜利油田物探研究院,东营257022

出　　处：《地球物理学进展》2014年第3期1369-1376,共8页Progress in Geophysics

基　　金：国家"十二五"科技攻关重大专项(2011ZX05006);中国石油化工股份有限公司(P12039)联系资助

摘　　要：本文从Biot提出的饱和流体多孔隙介质理论出发,在平面波入射和双相各向同性介质的假设条件下,推导了水平层状饱和流体多孔隙介质的频率—慢度域纵横波反射透射系数公式,制作了平面波和球面波的合成地震记录,解决了合成地震记录制作过程中的球面扩散和积分截断问题,分析了孔隙度和含气饱和度对纵横波正演模拟记录的影响.研究表明,迭代相似系数法压制截断效应效果良好,正演模拟前对测井曲线进行分层能提高计算效率.基于反射率法的饱和流体多孔隙介质全波场模拟不涉及波场解耦的问题,得到的三种波(快慢纵波和横波)能完全分离.模型和实际资料应用表明该方法能够准确实现层状饱和流体多孔隙介质的正演模拟及AVO正演模拟,为叠前波形反演奠定基础.Based on the Biot＇s saturated porous medium fluid theory,under the assumption of plane wave incidence and dualphase isotropic medium,this paper derived the horizontal layered saturated flow of porous medium frequency-slowness domain of p-wave reflection transmission coefficient formula,made the plane wave and spherical wave synthetic seismogram,solved the seismogram truncated spherical diffusion and integral problems in synthetic making process,analyzed the influence of porosity and gas saturation to the forward modeling of p-wave and s-wave record.Study shows that it has good effect on the iterative similarity coefficient method to suppress the truncation,and can improve the calculation efficiency by stratigraphic subdivision of log data before numerical simulation.Based on the reflectivity method of saturated porous medium fluid full wave field simulation not involved the decoupling problem of wave field,the three waves（fast Pwave,slow P-wave and the S-wave）can be completely separated.Application on model and actual data show that the method can achieve accurate layered saturated porous media forward modeling and AVO forward modeling,and make good foundation for prestack waveform inversion.

关 键 词：反射率法 双相同性介质 正演模拟 孔隙度 

分 类 号：P631[天文地球—地质矿产勘探]