叠前反演在苏里格气田盒8储层预测中的研究和应用  

Research and Application of Pre-stack Inversion in He8 Reservoir Prediction of Sulige Gasfield

作　　者：张盟勃[1] 史松群[1] 潘玉[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院

出　　处：《低渗透油气田》2007年第3期63-66,共4页

摘　　要：常规叠后波阻抗反演技术是建立在假设地震波垂直入射的基础上的，而实际的地震资料并非自激自收的地震记录，反射振幅是其中心点道集叠加平均的结果，它不能反映地震反射振幅随偏移距不同或入射角不同而变化的特点因此．利用常规叠后波阻抗反演不能得到可靠的波阻抗和其他岩性信息地震角道集资料能够保留和突出识别地层流体和岩性方面的AVO（或AVA）特征，由叠前数据进行弹性反演可获得弹性波阻抗，纵、横波阻抗，密度，泊松比等多种与岩性有关的参数体综合分析能够预测储层的岩性和物性，降低波阻抗反演的多解性主要结合实际对此方法和应用效果做简单的分析.The conventional post-stack wave impedance inversion technique is based on the assumption of the vertical seismic waves entering. And the actual seismic data is not self-excited and reception seismic records. Reflection amplitude is the results of superposition and average of the trace gathering. It does not reflect the characteristics of seismic reflection amplitude varying with different offset and angle of difference. Therefore, using conventional post-stack impedance inversion can not get reliable wave impedance and other lithologic information. Seismic angle trace gathering data can hold and give prominence to AVO （or AVA） features of formation fluid and lithologic identification. By elastic inversion of pre-stack data, we can obtain multiple lithology-related parameters of elastic wave impedance, longitudinal and transverse wave impedance, density, and the Poisson＇s ratio. Comprehensive analysis can predict reservoir lithology and physical properties, and reduce the multiple solutions to impedance inversion. This method and application effect are simplely analyzed in the paper mainly with the actual situation.

关 键 词：AVO 弹性反演 偏移距 入射角 

分 类 号：P618.13[天文地球—矿床学] P631.443[天文地球—地质学]