利用弹性波阻抗反演预测构造煤发育  

Prediction of tectonic coal development using elastic impedance inversion

作　　者：任川[1] 潘冬明[1] 彭刘亚[1] 赵新[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《煤田地质与勘探》2014年第3期92-95,99,共5页Coal Geology & Exploration

基　　金：国家科技重大专项(2011ZX05035)

摘　　要：弹性波阻抗反演方法摆脱了常规叠后波阻抗反演基于地震波垂直入射假设前提的局限,保留了反射波振幅随偏移距或入射角度的变化特征,考虑AVO效应,其反演结果对岩性探测更加灵敏。利用弹性波阻抗反演和常规叠后波阻抗反演的结果,构成煤体结构比例因子P。数值模拟分析和实际资料反演结果均表明:当P≥2.5时,构造煤比较发育;P值可以作为有效判别煤体结构的参考依据用以预测构造煤发育带。Elastic impedance inversion has been proved to be more sensitive in lithology detection than conventional wave impedance inversion mainly based on the hypothesis of seismic wave vertical incidence while AVO effect is considered when it comes to elastic inversion. This inversion method almost gets rid of the hypothesis of AI, and reserves the characteristics of seismic reflection amplitude versus offset or incident angle. The concept of coal body structure ratio P is brought up by the combination of both elastic inversion and conventional wave impedance. It is learned by both numerical analysis and actual inverted results that tectonic coal develops with high potential when P value is greater than or equal to 2.5. Studies indicate that it is effective and practical to predict tectonic coal zone with the ratio P.

关 键 词：弹性波阻抗 入射角度 煤体结构比例因子 反演 构造煤 

分 类 号：P631[天文地球—地质矿产勘探]