HTI煤层AVO响应特征及其影响因素  

AVO response characteristics and its influencing factors in HTI coalbed

作　　者：彭苏萍[1] 王宏伟[1,2] 杜文凤[1] 勾精为[1] 

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [2]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《煤炭学报》2013年第10期1715-1719,共5页Journal of China Coal Society

基　　金：国家科技支撑计划课题资助项目(2012BAB13B01;2012BAC10B03);国家重点基础研究发展计划(973)资助项目(2010CB226800)

摘　　要：针对两地层均为HTI介质的界面,根据位移理论,推导出地震纵波、横波分别从界面上方和下方入射情况下的反射纵波、反射横波、透射纵波和透射横波等发散系数精确表达式。推导公式可以解决地层物性差异大和大偏移距造成系数不够准确的问题。利用所推导的公式,得到HTI煤层AVO的发散系数曲线。通过分析发现,HTI煤层AVO响应特征,除了受背景介质物性参数影响外,还与裂隙密度、裂隙开度和裂隙填充物有关。在裂隙填充物为流体时,裂隙密度是影响AVO的最主要因素。According to the displacement theory, authors derived the exact scattering coefficients of reflected P wave, reflected S wave, transverse P wave and transverse S wave when P and S waves travel up and down through the bound- ary between the two HTI media. This expression can solve the problem of the inaccurate coefficient caused by the for- mation with great physical differences and the large offset. Through the derived formula, drew the AVO scattering curves of HTI coalbed. Crack density, aspect aperture and crack filling have effects on AVO response characteristics of HTI coalbed in addition to the physical parameters of the background medium. When the crack density is the most important factor. filling is fluid, crack

关 键 词：HTI介质 煤层 AVO 发散系数 

分 类 号：P631.3[天文地球—地质矿产勘探]