Microfacies and diagenetic alteration in a semi-deep to deep lacustrine shale:The Yanchang Formation in the Ordos Basin,China

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外文摘要：The mineralogical development and diagenetic sequence of lacustrine shales in the Chang 7 Member of the Yanchang Formation in the Ordos Basin are detailed studied.A model of their depositional system and a diagenetic diagram are proposed in this study.Through detailed petrographic,mineralogical,and elemental analyses,four distinct shale types are identified:argillaceous shale,siliceous shale,calcareous shale,and carbonate,clay,and silt-bearing shale.The main diagenetic process in argillaceous shale is the transformation of illite to smectite,negatively impacting shale porosity.Siliceous shale undergoes car-bonate cementation and quartz dissolution,contributing to increased porosity,particularly in mesopores.Calcareous shale experiences diagenesis characterised by carbonate formation and dissolution,with a prevalence of siderite.In carbonate,clay,and silt-bearing shale,the dissolution of K-feldspar contributes to illitization of kaolinite.Argillaceous shale,characterised by more clay minerals and lower mesopore volume,is identified as a potential hydrocarbon seal.Siliceous shale,with the highest pore volume and abundant inter-mineral pores,emerges as a promising shale oil reservoir.These findings contribute to a comprehensive understanding of shale properties,aiding in the prediction of shale oil exploration po-tential in the studied area.

外文关键词：

Ordos BasinYanchang FormationChang 7 MemberDiagenesisMicrofacies

作者：

Bin Bai、Jing-Yue Hao、Ling Fu、Yu-Xi Liu、Jian-Peng Wang、Lan Wang、Kevin G.Taylor、Lin Ma

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作者单位：

PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China

Department of Earth and Environmental Sciences,University of Manchester,Manchester,M13 9PL,UK

College of Earth Sciences,Jilin University,Changchun,130061,Jilin,China

Department of Chemical Engineering,University of Manchester,Manchester,M13 9PL,UK

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Science and Technology Major Project,ChinaScience and Technology Research Project of PetroChina Company Limited,ChinaChina Scholarship CouncilInternational Postdoctoral Exchange Fellowship Program,China Talent-Introduction ProgramNatural Environment Research Council,United Kingdom

项目编号：

42072186420900252016ZX05046-0012021DJ1806201806440002270152NE/R013527/1

出版年：

2024

DOI：

10.1016/j.petsci.2023.12.024

石油科学(英文版)

中国石油大学（北京）

石油科学(英文版)

影响因子：0.88

ISSN：1672-5107

年,卷(期)：2024.21(3)