裂缝型HTI介质中的弹性阻抗  

Elastic Impedance in Fractured HTI Media

作　　者：窦喜英[1] 韩立国[1] 刘春成[2] 杨小椿[2] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]中国海洋石油研究总院,北京100027

出　　处：《吉林大学学报（地球科学版）》2012年第4期1192-1198,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家科技重大专项项目(2011ZX05025-001-07)

摘　　要：在回顾封闭平行硬币状裂缝模型的基础上,将裂缝填充物性质、分布密度与背景介质的横纵波速度比,引入裂缝型水平横向各向同性介质纵波、转换横波弹性阻抗公式,并进行归一化弹性阻抗响应特征模拟。分析表明:裂缝介质弹性阻抗呈现方位各向异性,且随裂缝密度加大而增强;纵波、转换横波弹性阻抗在值域分布规律上具有较大区别;在典型砂岩介质的前提下,弹性阻抗差可以作为裂缝含气、含水指示因子定性地识别裂缝填充物性质。The fillings property and distribution density of cracks and vs/Vp of wall rocks are introduced into P wave and converted SV-wave elastic impedance equations in cracked horizontal transversely isotropic media, and normalization response characteristic of elastic impedance is simulated. The subsequent numerical simulation results show that elastic impedances in fractured media are azimuthally anisotropic and increase with the crack distribution densities; the range of elastic impedance for P-wave and converted SV-wave are in great differences; the elastic impedance differences may be considered as an identification of gas or water of crack fillings for the typical sandstones.

关 键 词：弹性阻抗 裂缝 填充物 裂缝密度 横纵波速度比 

分 类 号：P631.4[天文地球—地质矿产勘探]