鄂尔多斯盆地延安气田子长北部山2~3气藏气水分布及其影响因素分析  

Gas and Water Distribution and Influencing Factors of Shan23 Gas Reservoir in North Part of Yanan Gas Field of Ordos Basin

作　　者：高小平 黄国丽[2] 雷燕云 强腾 吴小斌[2] GAO Xiaoping;HUANG Guoi;LEI Yanyun;QIANG Teng;WU Xiaobin(The Research Center of the Gas Field Company of Yanchang Petroleum(Group)Company,Yanan Shaanxi 716000,China;College of Energy&Environment Engineering,Yan'an University,Yanan Shaanxi 7160o0,China)

机构地区：[1]延长石油(集团)气田公司研究中心,陕西延安716000 [2]延安大学石油工程与环境工程学院,陕西延安716000

出　　处：《佳木斯大学学报（自然科学版）》2024年第9期137-140,共4页Journal of Jiamusi University：Natural Science Edition

基　　金：陕西省自然科学基础研究计划项目(2021JQ-627);陕西省教育厅科研计划项目(22JK0615)。

摘　　要：上古生界是鄂尔多斯盆地重要的天然气产层,开发中的产水问题也逐渐引起关注。为弄清气水分布问题,本文在山2~3砂体精细刻画的基础上,分析气藏流体及气水平面分布特征,探究气藏单元、储层微观孔喉结构、封闭系统、构造对气水分布的影响,进而指导勘探。鄂尔多斯盆地东部山2~3气水分布主要受砂体单元控制,横向气藏分布不均,纯气层连续性差;碎屑颗粒间缝合线接触,大量硅质胶结使孔喉连通性差,引起储层束缚水饱和度高达60%,由此形成的封闭体系,进一步加剧成藏中可动水残留;山2~3气藏气水界面分布在-1500m~-1590m之间,构造起伏超过40m的区域形成局部水层富集。勘探开发中寻找连通的优质砂体单元成为关键,同时要特别注意构造落差大的低部位水层。The Upper Paleozoic is important natural gas productivity in Ordos Basin,and the water production in development has gradually attracted attention.-To clarify the distribution of gas and wa-ter,based on the fine description of Shan23 sand body,this paper analyzes the characteristics of gas res-ervoir fluid and horizontal distribution characteristics of gas and water,explores the influence of gas res-ervoir unit,reservoir micro pore-throat structure,sealing system and structure on gas and water dis-tribution,to guides exploration.The'gas and water distribution of Shan23 in the east area of Ordos basin is mainly controlled by'theiconnected sand units,with uneven distribution of horizontal gas reservoirs ahd'poor continuity of pure gas layers.The suture line contact between debris particles and the large a-mount of siliceous cementation result in poor pore throat connectivity,leading to a reservoir bound wa-ter saturation of up to 60%.The resulting closed system further exacerbates the residual mobile water in the reservoir.The gas water interface of the Shan2’gas reservoir is distributed between-1500 m and-1590 m,and local water layer enrichment is formed in areas with structural undulations exceeding 40 m.Accordingly,in exploration and development,finding high-quality connected sand units becomes crucial,while paying special attention to the formation of low water layers in the structure.

关 键 词：山23气藏 气水分布 气藏单元 影响因素 

分 类 号：TE122[石油与天然气工程—油气勘探]