叠前同时反演在灰质发育区识别储层及流体的应用研究  

Application of pre-stack simultaneous inversion in reservoir and fluid identification of the calcareous development zone

作　　者：杨亚华[1,2] 高刚[1,2] 魏红梅[3] 张建芝[3] 桂志先[1,2] 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,武汉430100 [2]长江大学地球物理与石油资源学院,武汉430100 [3]中国石化胜利油田分公司物探研究院,东营257022

出　　处：《地球物理学进展》2017年第1期332-338,共7页Progress in Geophysics

基　　金：中国石油科技创新基金项目(2015D-5006-0301)资助

摘　　要：东营凹陷的前期研究成果表明,该区储层存在着厚度薄、变化大且灰质含量高的特点,仅从常规地震剖面上,砂体与灰质泥岩的地震反射特征难以区分,给预测有效砂体及流体造成了严重影响,且叠后波阻抗反演无法识别灰质发育区的有效储层.针对以上问题,对测井资料进行了岩石物理参数敏感性分析,明确了灰质发育区浊积岩有效储层岩石物理特征,即横波阻抗可区分高阻储层与非储层,纵波阻抗可剔除高阻储层中的灰质,在前两参数优选出的有效储层基础上,纵横波速度比可区分流体类型.实际工区叠前同时反演结果与岩石物理分析及完钻开发结果吻合较好,说明利用叠前同时反演方法能有效剔除灰质对浊积岩有效储层预测的影响,亦能识别有效储层中的流体类型.Early research in Dongying sag suggests that the reservoirs are thin,large variation and high calcareous content. The seismic reflection character of sandstone and calcareous clay is hard to be distinguished only from the seismic profile. It brings huge difficulties to identify effective reservoir and fluid. And post-stack inversion can ’t identify effective reservoir in the calcareous development zone. To solve the problem above, rock physical parameters’ sensitivity of logging data was analyzed to confirm characteristics of effective reservoir in calcareous turbidite： the high resistance reservoir and the non-reservoir can be distinguished by Swave impedance,the calcareous in high resistance reservoir can be eliminated by P-wave impedance,and fluid types can be identified by the velocity ratio of P-wave and S-wave based on the effective reservoir optimized by P-wave impedance and S-wave impedance.The inversion results of actual area are well matched with the results of rock physical analysis,well logging and drilling. It shows that not only the calcareous ’ influence on effective turbidite reservoir prediction can be eliminated effectively,but also the fluid can be identified using simultaneous inversion method of pre-stack seismic data.

关 键 词：叠前同时反演 岩石物理分析 灰质 浊积岩 流体识别 储层预测 

分 类 号：P631[天文地球—地质矿产勘探]