西湖凹陷C油田花港组浅水三角洲储集层构型  

Architecture of Shallow⁃Water Delta Reservoir of Huagang Formation in C Oilfield,Xihu Sag

作　　者：何贤科 娄敏 蔡华 李炳颖 刘英辉 黄鑫 HE Xianke;LOU Min;CAI Hua;LI Bingying;LIU Yinghui;HUANG Xin(Shanghai Branch,CNOOC(China)Co.,Ltd.,Shanghai 200335,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335 [2]中海石油(中国)研究总院有限责任公司,北京100028

出　　处：《新疆石油地质》2023年第5期517-527,共11页Xinjiang Petroleum Geology

基　　金：中海石油(中国)有限公司综合科研项目(YXKY-2019-SH-01);中海石油(中国)有限公司综合科研重大项目(CNOOC-KJ 135 ZDXM 39 SH03)。

摘　　要：为了提高油藏描述精度,指导油气田中—后期剩余油调整挖潜,以西湖凹陷C油田花港组三段浅水三角洲储集层为例,利用岩心、粒度、测井和地震资料,开展储集层构型研究,建立浅水三角洲复合河道砂体的构型样式,并明确其空间演化规律。研究表明:H3c层为浅水三角洲上平原河道沉积,以垂向叠置厚层砂体为主;H3b层为浅水三角洲下平原河道沉积,发育侧向迁移型中—厚层砂体;H3a层为浅水三角洲前缘沉积,发育孤立型薄层砂体。中期基准面升降旋回控制垂向砂体的发育,随着湖平面的上升,研究区浅水三角洲呈退积序列,砂体由片状向孤立带状演变,储集层连通性逐渐变差。In order to improve the accuracy of reservoir characterization for purpose of tapping the potential of remaining oil in the middle to late oil and gas field development stage,taking the shallow⁃water delta reservoir of the Huagang formation in C oilfield,Xihu sag,as an example,the reservoir architecture was investigated by using core,grain size,logging,and seismic data.The architecture patterns of com⁃posite channel sandbodies of shallow⁃water delta facies were established,and their spatial evolution was clarified.The results show that the H3c layer represents the upper plain⁃channel deposit of shallow⁃water⁃delta facies,which is dominated by vertically stacked thick sandbod⁃ies;the H3b layer represents the lower plain⁃channel deposit of shallow⁃water delta facies,in which laterally⁃migrated medium⁃thick sand⁃bodies are developed;and the H3a layer represents the shallow⁃water delta⁃front deposit,which is featured with isolated thin sandbody.The development of vertical sandbodies was controlled by middle⁃term base⁃level cycle.As the lake level rose,the shallow⁃water delta in the study area formed a retrogradational sequence,and sandbodies evolved from sheet⁃like to isolated belt⁃like,resulting in deteriorating reser⁃voir connectivity.

关 键 词：西湖凹陷 花港组 浅水三角洲 分流河道 储集层构型 砂体 地震沉积学 

分 类 号：TE122[石油与天然气工程—油气勘探]