鄂尔多斯盆地东部二叠系山西组2_3段石英砂岩砂体结构类型及成岩作用差异
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  • 英文篇名:Sandbody architecture types and diagenesis differences of quartz sandstone of the Member 2_3 of Permian Shanxi Formation,eastern Ordos Basin
  • 作者:李咪 ; 姚泾利 ; 郭英海 ; 李壮福 ; 王怀厂 ; 宋雪娟
  • 英文作者:Li Mi;Yao Jing-Li;Guo Ying-Hai;Li Zhuang-Fu;Wang Huai-Chang;Song Xue-Juan;Key Laboratory of CBM Resource and Reservoir-Generating Process;School of Resources and Earth Science,China University of Mining & Technology;Research Institute of Petroleum Exploration and Development,Changqing Oilfield Company,PetroChina;
  • 关键词:砂体结构 ; 成岩作用 ; 石英砂岩 ; 致密储集层 ; 山西组 ; 鄂尔多斯盆地
  • 英文关键词:sandbody architectures;;diagenesis;;quartz sandstone;;tight sandstone reservoir;;Shanxi Formation;;Ordos Basin
  • 中文刊名:GDLX
  • 英文刊名:Journal of Palaeogeography(Chinese Edition)
  • 机构:煤层气资源与成藏过程教育部重点实验室;中国矿业大学资源与地球科学学院;中国石油长庆油田分公司勘探开发研究院;
  • 出版日期:2018-06-01
  • 出版单位:古地理学报
  • 年:2018
  • 期:v.20
  • 基金:国家自然科学基金项目(编号:41772130)资助~~
  • 语种:中文;
  • 页:GDLX201803010
  • 页数:12
  • CN:03
  • ISSN:11-4678/P
  • 分类号:121-132
摘要
鄂尔多斯盆地东部子洲—清涧地区二叠系山西组23段石英砂岩区块单井产能与砂体结构类型具有一定相关性。基于单砂体垂向粒度韵律和自然伽马测井资料,将砂体结构划分出块状型砂体、正粒序型砂体和叠加型砂体3种类型。通过铸体薄片鉴定和粒度分析实验,对3种类型砂体储集层在成岩作用类型、特征、发育程度、产物、垂向变化及成岩孔隙演化的差异性进行表征。研究表明,3类砂体的溶蚀作用、压实作用强度及分布特征存在较大差异,粒度及其垂向分布是制约不同结构类型砂体成岩演化的直接因素,进而影响储集层物性,决定了含气层与致密层的垂向分布规律。块状型砂体储集层原生孔隙、次生溶孔共同发育,含气层厚度较大,局部致密。正粒序型砂体垂向物性差异较大,中—下部储集层溶蚀程度较弱,以原生孔隙为主,次生孔隙少量发育,为含气层;上部储集层压实、胶结作用强烈,相对致密。叠加型砂体储集层形成于河流控制作用逐渐增强的过渡环境,兼有正粒序型、块状型砂体的特征,多层含气且厚度大。
        There exists a certain correlation between sandbody architectures and single well production of quartz sandstone of the Member 2_3 of Permian Shanxi Formation in the Zizhou-Qingjian area in theOrdos Basin. Based on the vertical grain-size cycles of the individual sandbody and natural gamma logging data,the sandbody architectures of the study area has been divided into block,normal grading and superimposed types. The paper shows the differences of diagenesis in types,characteristics,intensity,products,vertical variation and pore evolution of the three type sandbodies by casting thin sections observation and particle size analysis. The study shows the intensity and distribution characteristics of the dissolution and compaction of the three type sandbodies are quite different. The vertical distribution of particle size is the direct factor that restricts the diagenetic evolution of the different types of sandbodies,which in turn affect physical property of sandstone reservoirs and finally determine the vertical distribution of gas-bearing layer and tight layer. The reservoir of the block type sandbodies has both primary pores and induced pores of which the gas-bearing layer is thick and tight layer is locally developed. The middle and lower part of reservoirs of normal grading type sandbodies are characterized by poor dissolution degree,which have more primary and less induced pores and are gas-bearing layer. The upper part of reservoir is tight due to strong compaction and cementation. The superimposed type sandbodies formed in the sedimentary environment of gradually strengthened fluvial influence have characteristcs of the both two former types,with the gas-bearing layers are thick and multizone.
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