P-P、P-SV波叠前联合反演在致密气储层预测中的应用  

Application of P-P and P-SV wave pre-stack joint inversion in tight sandstone gas reservoirs

作　　者：强敏 段志强 张吉[2,3] 张林科 陈大宏[1] 李旭 QIANG Min;DUAN Zhi-qiang;ZHANG Ji;ZHANG Lin-ke;CHEN Da-hong;LI Xu(Changqing Branch of Geophysical Research Institute,BGP Inc.,CNPC,Xi＇an 710021,China;Sulige Research Center,PetroChina Changqing Oilfield Company,Xi＇an 710018,China;Nationl Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Field,Xi＇an 710018,China)

机构地区：[1]中国石油东方地球物理公司研究院长庆分院,西安710021 [2]长庆油田苏里格气田研究中心,西安710018 [3]低渗透油气田勘探开发国家工程实验室,西安710018

出　　处：《地球物理学进展》2018年第4期1540-1544,共5页Progress in Geophysics

基　　金：国家重大科技专项"鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程(2016ZX05050)"和"长庆气田稳产及提高采收率技术研究(2016E-0509)"联合资助

摘　　要：常规叠前反演大都是利用P-P纵波单分量资料基于各向同性理论的近似公式来反演,仅利用P-P纵波资料反演地层岩性等弹性参数,无论在理论基础还是反演精度上都存在不足,且反演结果具有多解性.而同时用P-P纵波和P-SV转换波资料联合反演,可以增加约束条件,提高反演结果的稳定性、可靠性.本文以各向异性理论为基础,利用实际3D3C资料,进行了P-P纵波、P-SV转换波联合叠前反演计算,P-P纵波、P-SV转换波叠前联合反演利用了纵波和转换波的叠前资料,尽可能保留了地层的AVO信息,输入数据增加了转换横波数据,同时利用了纵波和转换波两个独立变量信息,采用完全Knott-Zoeppritz方程求解,反演结果比P-P纵波单分量资料叠前反演更稳定、可靠、反演精度明显提高.研究区实际资料计算结果表明,反演结果可以更真实的反映储层段的物性和含气性,P-P纵波、P-SV转换波联合叠前反演比P-P纵波单分量资料叠前反演预测储层符合率提高了十个百分点,该反演方法是一种有效的反演方法.Conventional pre-stack inversion for lithologic parameters are mostly based on the approximation formula of the isotropic theory,and it only uses P-P wave data. This method has some shortcomings both in theories and accuracy of invsion,and multisolution of the inversion is its fatal problem. P-P and P-SV wave joint inversion enhances the stability and reliability,which adds several constraint conditions. In this paper,based on the anisotropy theory,the joint inversion is calculated by using the actual data of3 D3 C seismic. Compared with the pre-stack inversion of P-P wave data,the joint inversion is more stable and reliable, and it obviously improves the accuracy of inversion by using the partial stack data of P-P and P-SV waves. It makes best use of AVO information of seismic data as far as possible,su P-Plements P-SV wave data as input,and uses the two independent variables of P-P and P-SV waves,solving Knott-Zoeppritz equations.The drilling successful ratio has been increased by more than10% by the joint inversion using the P-P and P-SV waves compared with using the P-P wave data alone in our study area. The joint inversion is proved to be effective.

关 键 词：P-SV转换波 叠前联合反演 3D3C(三维三分量) 致密气 

分 类 号：P631[天文地球—地质矿产勘探]