地震沉积学在复杂岩性地区的应用——以歧北凹陷沙二段为例  

Application of seismic sedimentology in the area with complex lithologies:A case from the second member of Shahejie Formation in Qibei Sag

作　　者：洪忠[1] 刘化清[1] 苏明军[1] 牛海青[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《岩性油气藏》2012年第4期40-44,共5页Lithologic Reservoirs

基　　金：中国石油天然气股份有限公司"歧口富油气凹陷大油气田勘探及综合配套技术研究"项目(编号:2008-030504)部分成果

摘　　要：以地震沉积学理论为指导,立足于地震岩性学和地震地貌学,在歧北凹陷沙二段滨4油组开展地震沉积学研究。针对研究区复杂岩性波阻抗值差异小以及自然伽马值差异明显的特点,开展相对波阻抗约束下的测井参数反演工作来获取岩性数据体。同时,结合测井和钻井资料,对地层切片进行地震沉积学解释。研究结果表明:测井参数反演方法可以有效区分研究区的复杂岩性,基于等时地层格架生成的一系列地层切片识别出了滨4油组三角洲—湖泊沉积体系中不同的沉积单元,准确反映了其物源方向、储层平面展布特征及空间演化史。With the guidance of seismic sedimentology theory,the seismic sedimentology study was carried out in the Bin-4 oil group of the second member of Shahejie Formation in Qibei Sag based on the research of seismic lithology and geomorphology.According to the geophysical response features of complex lithologies,the log parameter inversion constrained by relative acoustic impedance was conducted to obtain lithologic data.With the help of logging and well drilling data,the stratal slices were interpreted.The result shows that log parameter inversion can be used to distinguish the complex lithologies.The source direction,evolutional history and reservoir distribution characteristics of the sandstone of delta-lacustrine depositional system in Bin-4 oil group were clearly delineated by a series of stratal slices produced under the isochronous stratigraphic framework.

关 键 词：地震沉积学 复杂岩性 测井参数反演 歧北凹陷 

分 类 号：P539.2[天文地球—古生物学与地层学]