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白云凹陷东部A井区油气输导体系及其控藏作用
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  • 英文篇名:Hydrocarbon pathway systems and their control on hydrocarbon migration and accumulation in A area, eastern Baiyun Sag
  • 作者:刘晓凤 ; 曾溅辉 ; 张忠涛 ; 石宁 ; 张功成 ; 余一欣 ; 杨海长 ; 张博 ; 王晨 ; 张靖 ; 王芳芳
  • 英文作者:LIU Xiao-feng;ZENG Jian-hui;ZHANG Zhong-tao;SHI Ning;ZHANG Gong-cheng;YU Yi-xin;YANG Hai-zhang;ZHANG Bo;WANG Chen;ZHANG Jing;WANG Fang-fang;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing;College of Geosciences,China University of Petroleum,Beijing;Shenzhen Branch,CNOOC Limited;CNOOC Research Institute;
  • 关键词:油气输导体系 ; 断层封闭性 ; 构造脊 ; 复合输导体系 ; 油气运移和聚集 ; 白云凹陷东部
  • 英文关键词:Hydrocarbon pathway systems;;Fault sealing ability;;Structure ridge;;Complex pathway system;;Hydrocarbon migration and accumulation;;Eastern Baiyun Sag
  • 中文刊名:DQWJ
  • 英文刊名:Progress in Geophysics
  • 机构:中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;中海石油(中国)有限公司深圳分公司;中海油研究总院;
  • 出版日期:2018-07-26 19:17
  • 出版单位:地球物理学进展
  • 年:2019
  • 期:v.34;No.155
  • 基金:国家油气重大专项“海洋深水区油气勘探关键技术”(2016ZX05026-007)资助
  • 语种:中文;
  • 页:DQWJ201903025
  • 页数:13
  • CN:03
  • ISSN:11-2982/P
  • 分类号:215-227
摘要
南海北部深水区白云凹陷油气资源丰富,勘探潜力巨大,白云凹陷东部目前已获得多个商业性油气发现,但是该地区油气分布较复杂,油气聚集规律仍有待深入分析.本文基于三维地震、钻井、测井和岩心分析资料,对白云凹陷东部A井区油气输导体系及其控藏作用进行了综合研究.研究表明:研究区发育断裂、不整合面和砂岩输导层三类输导体.断开层位多,长期活动的Ⅰ类断裂为油源断裂,垂向上深部主要起输导油气作用,而浅部垂向和侧向封闭性较好,主要起封堵油气的作用;断开层位少,活动时期短的Ⅱ类断裂主要起封堵油气的作用.砂岩输导层主要为ZJ2段和ZJ3段砂体,输导能力强;而珠海组砂体的区域输导能力较差.T70不整合面主要为削超不整合和平行不整合.靠近洼陷的平行不整合面上、下分别为渗透性的砂岩和灰岩岩层,为油气输导层,东部隆起区的削超不整合则有利于油气聚集.分析得出:沟通白云主洼烃源岩的3号断层系发育的断面脊、ZJ2段和ZJ3段砂岩构造脊以及自西向东发育的不整合构造脊控制了油气优势运移方向,为区域油气运移的优势通道.三种输导体组合形成的复合输导体系类型决定了研究区的油气运移聚集规律:断裂与砂体组成的断-砂复合输导体系表现为断-砂耦合输导、油气近源成藏模式,油气成藏的主要层位为ZJ2段;而断裂与砂体和不整合面复合-网状输导体系则表现为断-砂-不整合-构造脊复合输导、油气远源多层系成藏模式,油气纵向上具有多层系成藏的特征.
        Baiyun Sag in deep-water area of Northern South China Sea is rich in petroleum resources and has a significant petroleum potential. At present, a number of commercial hydrocarbon discoveries have been made in the eastern Baiyun Sag. However,the distribution of oil and gas in this area is quite complicated,further investigations are required on the regularity of hydrocarbon accumulation. Based on 3D seismic,drilling,logging and core analysis data,this passage comprehensively evaluated hydrocarbon pathway systems and their controlling function on hydrocarbon migration and accumulation in A area,eastern Baiyun Sag. We find out three kinds of dominated hydrocarbon migration pathways. Type I faults which cut off many horizons are connected-source rock faults,and deep parts of faults act as the predominant pathway for vertical hydrocarbon migration,while shallow parts of faults are well sealed laterally and vertically for oil and gas; Type II faults which cut off few horizons have strong lateral and vertical oil-gas sealing ability. The sand body of ZJ2 and ZJ3 are dominant sandstone transporting layers,which have strong oil-gas transporting ability;while the sand body of Zhuhai Formation is pretty poor. T70 unconformity can be divided into two types: denudation-onlap unconformity present in the eastern uplift area and parallel unconformity present in the sagging area. The permeable beds consist of sandstone and limestone above and below the parallel unconformity interface are the pathways for hydrocarbon migration,and the denudation-onlap unconformity is the favorable place for petroleum accumulation. The bridge of fault system 3 connecting source rock of main subsag,the structure ridge of sandstone of ZJ2 and ZJ3 member,and the ridge of T70 unconformity control the dominant pathway for hydrocarbon migration. The pathway systems,which are constituted of fault, unconformity and sandstone transporting layer,determine the law of hydrocarbon accumulation:the model of source-proximal hydrocarbon accumulation is in the control of complex pathway system coupling of fault and sandstone, and hydrocarbon mostly accumulate in ZJ2 member; while the model of multi-layer hydrocarbon accumulation is controlled by complex-meshwork pathway system which consists of fault,sandstone,unconformity and their structure ridge,and hydrocarbon accumulation characteristics of multi-layer reservoirs are vertically presented.
引文
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