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西湖凹陷平北斜坡带海陆过渡相源-汇系统差异性及其耦合模式
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  • 英文篇名:Differentiation and Coupling Model of Source-to-Sink Systems with Transitional Facies in Pingbei Slope of Xihu Sag
  • 作者:蔡华 ; 秦兰芝 ; 刘英辉
  • 英文作者:Cai Hua;Qin Lanzhi;Liu Yinghui;Shanghai Branch of CNOOC Ltd.;
  • 关键词:源-汇系统 ; 西湖凹陷 ; 平湖组 ; 海陆过渡相 ; 多属性聚类 ; 石油地质
  • 英文关键词:Source-to-Sink (S2S) system;;Xihu Sag;;Pinghu Formation;;transitional facies;;seismic multi-attribute;;petroleum geology
  • 中文刊名:DQKX
  • 英文刊名:Earth Science
  • 机构:中海石油(中国)有限公司上海分公司;
  • 出版日期:2019-02-26 09:23
  • 出版单位:地球科学
  • 年:2019
  • 期:v.44
  • 基金:国家科技重大专项(No.2016ZX05027001)
  • 语种:中文;
  • 页:DQKX201903016
  • 页数:18
  • CN:03
  • ISSN:42-1874/P
  • 分类号:202-219
摘要
为了推进西湖凹陷平北斜坡带岩性油气藏领域的勘探进程,厘清岩性体发育模式和分布规律,基于最新钻井、薄片、重矿物及覆盖全区的高精度三维地震资料,精细刻画西湖凹陷平北斜坡带源-汇系统单元,探讨构建了不同物源供给、地形格局和潮汐改造背景下源-汇系统耦合模式及其差异性.通过重矿物组分与岩屑分析,明确物源区物源组分、方向及供给强度;利用测井与岩心、地震相和多属性聚类分析明确潮汐改造作用在沉积物分布和演化上的响应.结合古地貌形态和断裂活动性,定量-半定量分析源-汇系统各单元要素间相关性,明确物源供给、地形格局和潮汐作用控制下源-汇系统耦合模式及其差异性,分别构建低物源供给-单断-潮汐改造型耦合模式、中等物源供给-古隆起与反向断阶-河控-潮控型耦合模式和高物源供给-同向断阶-河控-潮控型耦合模式.据此指出各源-汇系统内沉积体展布成因及规律,有效指导海陆过渡相背景下有利储集目标预测,为类似地质背景下油气勘探提供思路与技术方法支持.
        In order to promote the exploration process of lithologic hydrocarbon reservoir in Pingbei slope of Xihu Sag and to clarify the development mode and distribution law of lithologic sand body,a comprehensive study is presented in this paper,based on the analyses of the latest drilling,thin sections,heavy minerals and high-resolution 3D seismic data of Pingbei slope in the Xihu Sag,East China Sea.The analyses of heavy mineral composition and debris show the components,orientation,and supply strength of the provenance.In addition,the analyses of logging and cores,the seismic facies and multi-attribute reveal the tidal transformation mechanism in the distribution and evolution of sediments.On the basis of quantitative and semi-quantitative analysis of various elements of Source-to-Sink(S2S)systems correlation combined with the paleogeomorphology and faults,the coupling differences of S2S systems under the control of provenance supply and tidal action are clarified.The results show that low provenance supply-single stage fault-tidal control,intermediate provenance supply-paleo-uplift and reverse step faults-river-tidal control,and high provenance supply-consequent step faults-river-tidal control coupling models are established.On this basis,the sedimentary distribution cause and law of each S2S system are systematically discussed.The establishment of different coupling models of S2S systems can provide the key directions of petroleum exploration.In addition,this study also provides reference methods and ideas for the research of S2S systems under different geological backgrounds.
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