薄煤层P-SV转换波AVO正演研究  

Converted wave AVO forward method of P-SV thin coal bed

作　　者：邓小娟[1] 彭苏萍[1] 杜文凤[1] 勾精为[1] 庆怀韬[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

出　　处：《煤炭学报》2012年第1期62-66,共5页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2009CB219603;2009CB724601;2010CB226800)

摘　　要：研究了EDA(Extensive Dilatancy Anisotropy)介质中的横波分裂现象,在此基础上,对薄煤层的转换波反射系数进行了推导,并建立了含煤地层模型,并对该模型进行了P-SV转换波AVO正演模拟。模拟结果分析发现:入射角为0时,薄层的转换波反射系数为0;随着入射角的增大,反射系数先增大到一个最大值,然后开始减小,薄层的厚度对于薄煤层的转换波反射系数存在较大的影响,裂隙密度和裂隙的填充物对于薄层的转换波反射系数在大角度入射时存在较大影响,这种影响与EDA介质的各向同性背景参数有较大关系,裂隙的开度对于薄层转换波反射系数几乎没有影响。Researched on the S-wave splitting phenomenon in the EDA medium,and based on it,deduced the converted wave reflection coefficient,built and did the P-SV converted wave AVO forward modeling on the coal measure strata model.The results show that when the incidence angle is 0,the thin layers＇ converted wave reflection coefficient is 0.As the incidence angle grows,it increases to a maximum value at first and then begins to decrease.The thickness of the thin layers has a great effect on it in the thin coal beds,and so are the fracture density and the filler of fracture when it is the large angle incidence.This influence has much to do with the background parameter of the isotropic of the EAD medium.The fracture＇s opening hardly affects the converted wave reflection coefficient of the thin beds.

关 键 词：薄煤层 AVO 转换波 EDA介质 

分 类 号：P631.4[天文地球—地质矿产勘探]