叠前同步反演在涠西南凹陷储层预测中的应用  

Application of Prestack Simultaneous Inversion of Reservoir Prediction in Weixinan Depression

作　　者：刘涛[1] 方中于[1] 但志伟[1] 逄建东[1] 吴其林[1] 刘明全 

机构地区：[1]中海油能源发展股份有限公司地球物理研究所,广东湛江524000 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《石油天然气学报》2011年第9期77-81,167,共5页Journal of Oil and Gas Technology

基　　金：国家科技重大专项(2008ZX05023)

摘　　要：涠西南凹陷流沙港组一段为多期多物源的(扇)三角洲沉积,岩性为砂泥岩互层,砂层薄且横向变化大、波阻抗差异小,叠后波阻抗反演、拟声波阻抗反演等方法进行储层预测效果不甚理想。基于改进后的Fatti近似弹性波阻抗方法,建立了基于真实岩石物理参数的变量关系,提高了反演精度。应用从弹性反演数据体中获得的密度、纵波阻抗、拉梅常数、剪切模量参数进行交汇,在涠西南凹陷流沙港组一段储层预测中取得了良好的应用效果。The first stratum of Liushagang Formation in Weixinan Depression was a fan delta with the property of multiple stages and multiple provenances.The characters of sand-mudstone Inter-beds,thin and horizontally variable thickness of sandstone formation,and small value of elastic impedance contrast made it unsatisfied in reservoir prediction using poststack inversion methods.Based on the improved Fatti elastic impedance theory,variable relations among the petro-physical parameters were established and the inversion precision was improved.With the method of plot-crossing the parameters including density,P-impedance,Lame's constant,shear modulus from the dataset of the prestack elastic impedance,better effect is obtained for the reservoir prediction in Liushagang Formation of Weixinan Depression.

关 键 词：叠前同步反演 密度 拉梅常数 储层预测 

分 类 号：P631.44[天文地球—地质矿产勘探]