基于各向异性的薄煤层AVO正演方法  

AVO forward method of anisotropic thin coal bed

作　　者：邓小娟[1] 彭苏萍[1] 林庆西[1] 勾精为[1] 杜文凤[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》2010年第12期2053-2058,共6页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)项目(2009CB219603;2009CB724601;2010CB226800);国家自然基金面上项目(40874071)

摘　　要：针对煤层厚度薄、煤层顶底界面波阻抗差较强的特点,从一般各向异性介质的弹性动力学方程出发,推导出了两层EDA介质水平界面情况下平面波的反射和透射系数公式,并进一步推导了3层介质(即EDA介质薄层位于两个各向同性介质之间)的平面波反射和透射系数。利用所推导的AVO公式,对煤系地层进行了纵波AVO正演模拟,对模拟结果进行分析发现:薄层的厚度、EDA介质的各向同性背景参数对薄层纵波反射系数有较大影响,裂隙开度对薄层反射系数几乎没有影响。In order to adopt the coal bed whose layer is thin and the differences of elastic impedance is big,based on the anisotropic elastodynamic equations,the reflection and transmission coefficients of the EDA medium with horizontal interface were derived.And then the reflection and transmission equation for horizontal thin bed medium were deduced.The thin coal bed models used for AVO forward modeling were designed,and the reflection coefficients were figured out.Based on the graph of reflection,it can be easily found that the coefficients are greatly influenced by the thick of the coal bed and the background parameters,the fracture aspect radio has little effect on the coefficients.

关 键 词：薄煤层 各向异性 AVO正演方法 EDA介质 

分 类 号：P631.4[天文地球—地质矿产勘探]