河流相砂体精细描述在西湖凹陷某气田的应用  

Application of sandbody description of fluvial facies in one gas field of Xihu Sag

作　　者：张锡楠 程超 鞠颢 黄启彰 ZHANG Xinan;CHENG Chao;JU Hao;HUANG Qizhang(CNOOC (China)Co., Ltd. Shanghai Branch, Shanghai 200335, China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《中国地质调查》2020年第5期25-32,共8页Geological Survey of China

基　　金：国家科技重大专项“东海厚层非均质性大型气田有效开发关键技术(编号:2016ZX05027-004)”项目资助。

摘　　要：西湖凹陷某气田钻井资料少,传统陆上利用多井点资料描述河流相储层展布的方法不适用该气田。前人关于该区为浅水三角洲平原分流河道沉积、储层横向上连片分布的认识过于宏观,不能指导气田的开发生产。研究从已钻井资料出发,充分利用海上高分辨率三维地震资料对河流相储层横向识别精度高、单一河道边界刻画清晰的特点,开展地震沉积学研究和单河道精细解释,识别出4期目的层单河道砂体,形成横向上逐渐向东迁移摆动、纵向上相互叠置的沉积演化模式。这一认识指导了地质模型优化,解决了生产井动静储量差异矛盾,能够有效指导气田开发生产。在海上少井条件下,利用地震沉积学方法进行河流相砂体精细描述的方法有较强的适用性。Due to the few drilling data of one gas field in Xihu Sag,the traditional methods of fluvial reservoir description by multi well data in onshore oil field are not suitable for the offshore oil and gas field.The previais cognition is too macroscopic about the distributary channel deposit of the shallow delta and the horizontally continuous distribution of reservoirs it could not guide the development and production of gas field.Based on the well data,the authors made full use of the offshore high-resolution 3D seismic data with characters of high-precision identification of fluvial reservoir and clear delineation of single channel boundary to carry out seismic sedimentology research and fine interpretation of the single channel.Four stages of single channel sandbody were identified in the target layer,and the sedimentary evolution pattern of a gradual migration to the east on the transverse and overlapping on the longitudinal was shown.The geological models have been improved and the contradiction between dynamic geological reserves and geological reserves of production wells has been solved by this research,which can be used to effectively direct the field development and production.The seismic sedimentology method is an effective method to describe fluvial sandstones in the offshore oil and gas field with less well data.

关 键 词：等时地层格架 地震沉积学 地层切片 沉积相 

分 类 号：P618.130.2[天文地球—矿床学]