MP算法在地震波阻抗反演中的应用  

Application of matching pursuits to seismic inversion

作　　者：周东勇[1] 文晓涛[1] 贺振华[1] 蒲勇[2] 黄德济[1] 胡军辉[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中国石化股份有限公司勘探南方分公司,成都610041

出　　处：《成都理工大学学报（自然科学版）》2014年第1期87-93,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金资助项目(41174115);国家自然科学基金青年基金资助项目(40904034);国家重大专项(2011ZX05005-003)

摘　　要：当孔隙中充填油气后,波阻抗相对较低,准确反演地下地质体波阻抗信息可在一定程度上为油气检测提供依据。利用基于雷克子波原子库的匹配追踪(MP)算法对地震信号进行稀疏分解,进而可实现对地下地质体的高精度波阻抗反演。模型试算表明,MP算法可以用于地震信号的稀疏分解,且两层间厚度λ/4调谐时,仍可大体反映层位及系数的相对大小关系。通过对实际地震资料的计算表明,该算法也适用于实际资料,且与实钻情况吻合。Hydrocarbon-bearing zone with pore configuration development and lower wave impedance,is able to inverse accurately the impedance information of a geological body wave and to some degree,provide the basis for the hydrocarbon detection of underground rocks.Matching pursuit,which is based on the Ricker wave atoms library,can sparsely decompose the seismic signal.In this way,it will achieve impedance inversion of high-precision wave in the subsurface geological body.This process has been proved to be true through model trial.Besides,MP,in general,can still reflect the relative size of horizon and coefficient when λ/4 tunes between two layers.By calculating the actual seismic data,the authors think that MP algorithm is also applicable to the actual data and the result is consistent with the actual drilling.

关 键 词：匹配追踪算法 波阻抗反演 稀疏分解 雷克子波 

分 类 号：P631.443[天文地球—地质矿产勘探]