各向异性介质三维纵横波联合叠前反演方法及应用  

3D PP-PS joint inversion method and application in anisotropic medium

作　　者：李录明[1] 罗省贤 王明春[1] 孔选林[1] 周怀来[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,地球探测与信息技术教育部重点实验室,四川成都610059

出　　处：《石油地球物理勘探》2010年第1期60-65,164+170,共6页Oil Geophysical Prospecting

基　　金：高等学校博士学科专项科研基金(20070616004);中国石油天然气集团公司物探重点实验室开放基金(GPKLl0803);国家863项目(2007AA060505)联合资助

摘　　要：为了提高储层预测精度,本文利用三维三分量资料及前期处理结果,以各向异性(TI)介质弹性波传播理论为基础,研究了多波精确振幅特征方程,进而推出三维各向异性介质纵横波联合叠前岩性参数反演方法。该方法利用叠前NMO道集,将5个岩性参数在同一方程联合求解,可同时获得5个反演参数。为保持反演参数的独立性,可直接反演地层纵波速度、横波速度、密度及另两个各向异性系数,进而计算出地层的弹性参数、弹性阻抗(EI)及弹性阻抗梯度(EIG)等共13个岩性、弹性参数,用于对岩性及流体的识别和描述。文中采用的纵横波联合叠前反演方法可提高反演的可靠性和精度,经实际三维多波地震数据处理证明了方法的适用性。In order to raise precision in reservoir prediction,3D3C seismic data and previous processing results were used,based on elastic wave propagation theory in anisotropic medium,multi-wave accurate amplitude characteristic equation (Amplitude Versus Angle) was studied,as a result the PP-PS joint pre-stack lithology inversion method for 3D anisotropic medium was developed.The NMO gathers were used in this method,5 lithologic parameters were jointly solved in one equation so that 5 inversion parameters were obtained at the same time.In order to keep the independence of the inversion parameters,P wave velocity,Share wave velocity,density,and 2 other anisotropic parameters of the formation can be directly inverted,then 13 lithologic and elastic parameters including elastic parameter,elastic impedance,elastic impedance gradient and so on were calculated and were used to identify and describe the lithology and fluid.The PP-PS joint pre-stack inversion method can improve the reliability and accuracy of the inversion,3D multi-wave seismic data processing of the field data proved the suitability of the method.

关 键 词：各向异性介质 三维三分量 反演方法 纵横波 叠前 岩性参数 应用 各向异性系数 

分 类 号：P631.4[天文地球—地质矿产勘探]