灰质背景下浊积岩储层地震响应特征及识别方法——以东营凹陷坨71井区为例  

Seismic response characteristics and identification methods of turbidite reservoir in limestone background:A case study of Well Tuo71 Area in Dongying Sag

作　　者：张建芝[1] 李谋杰[2,3] 张云银[1] 魏红梅[1] 商伟[1] ZHANG Jianzhi;LI Moujie;ZHANG Yunyin;WEI Hongmei;SHANG Wei(Geophysics Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257022,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan City,Hubei Province,430100,China;College of Geophysics and Petroleum Resources,Yangtze University,Wuhan City,Hubei Province,430100,China)

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

出　　处：《油气地质与采收率》2019年第6期70-79,共10页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“渤海湾盆地济阳坳陷致密油开发示范工程”（2017ZX05072）

摘　　要：东营凹陷发育的灰质背景下的浊积岩储层以薄层和薄互层为主。由于灰质泥岩与浊积岩储层波阻抗差异不大,导致二者难以识别,为此提出叠后弹性波动方程数值模拟和叠前地震反演相结合的方法。为摒除灰质泥岩的干扰,充分发挥叠前地震反演的弹性信息优势,在测井约束叠前地震反演的基础上,引入敏感因子开展弹性敏感性定量评价,提出多参数岩性信息融合构建数学模型,优选对灰质泥岩和浊积岩敏感的弹性参数。同时结合叠后弹性波动方程数值模拟,开展灰质背景下厚层浊积岩和薄互层浊积岩储层识别方法研究,以达到识别储层的目的。针对东营凹陷坨71井区灰质背景下的浊积岩储层,利用多参数岩性信息融合与弹性波动方程数值模拟相结合的方法,有效解决了储层识别与优选的问题。The turbidite reservoirs in Dongying Sag in limestone background mainly exist in forms of thin beds or thin interbeds. It is difficult to identify them on seismic section because there is little difference in wave impedance between limy mudstone and turbidite reservoir. Thus a method combining numerical simulation of post-stack elastic wave equation and prestack seismic inversion is proposed. In order to eliminate the interference of limy mudstone and take full usage of elastic information of prestack seismic inversion,on the basis of logging-constrained prestack inversion,a sensitivity factor R is introduced to quantitatively evaluate the lithological sensitivity,and considering multi-elastic lithological information fusion,a mathematical model is constructed to optimize elastic parameters that sensitive to limy mudstone and turbidite. Meanwhile,combined with the numerical simulation of poststack elastic wave equation,the identification methods of thick turbidite and thin interbedded turbidite reservoirs in limestone background are studied to achieve the purpose of reservoir optimization. For turbidite reservoirs in limestone background in Well Tuo71 Area,Dongying Sag,combining multi-elastic lithological information fusion with the numerical simulation of elastic wave equation,an effective identification method of turbidite and thin interbeds of turbidite in limestone background is proposed,which is important to guide the reservoir identification and optimization.

关 键 词：灰质背景 浊积岩储层 数值模拟 波阻抗反演 岩性信息融合 

分 类 号：P631.4[天文地球—地质矿产勘探]