地震波阻抗反演预测采区孔隙度方法  

Predicting aquifer porosity of coal mine by impedance inversion

作　　者：邹冠贵[1] 彭苏萍[1] 张辉[1] 张凯[1] 师素珍[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》2009年第11期1507-1511,共5页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)基金资助项目(2009CB219603;2006CB202209);国家自然基金资助项目(40874071;50490271;40672104);中国博士后科学基金资助项目(20080440442)

摘　　要：分析了基于W yllie时间平均方程的孔隙度求取方法,通过分析反演原理对比不同波阻抗反演的适用条件,并给出应用实例.结果表明:对于缺乏测井资料的采区,含水层厚度较大时,采用相对保幅,正确偏移成像的地震数据进行递推反演,能反映出目的层孔隙度的变化规律;对于有测井资料的采区,测井约束反演综合利用纵向上高分辨率的测井资料和横向上高密度的地震资料,能获得薄层的孔隙度分布规律;波阻抗值增大时,孔隙度值单调递减.The relation between porosity and impedance was derived from Wyllie time-average equation, the applicable conditions of impedance inversion was compared via analyzing impedance inversion principles, then the application example was given. The results show that reeursive inversion is used to obtain impedance in mining area for logging data shortage and the aquifer thickness above a quarter seismic wavelengths, the impedance bases on seismic data with relative amplitude and correctly migration imaging correctly reflects the layer＇ s relative porosity changes. The logging constrained inversion is used to obtain impedance in mining area for logging data rich; the imped- ance comprehensive utilizing high-resolution vertical log data and high-density horizontal seismic data correctly reflects the porosity distribution of the thin layer. The porosity is monotone decreasing when impedance increasing.

关 键 词：递推反演 测井约束反演 孔隙度 富水性 

分 类 号：P631.4[天文地球—地质矿产勘探]