古地理学报 ›› 2025, Vol. 27 ›› Issue (3): 696-713. doi: 10.7605/gdlxb.2025.028

• 古地理学及矿产资源 • 上一篇    下一篇

川东地区侏罗系自流井组东岳庙段陆相页岩岩相类型及储集层特征*

陈旺1,2(), 王兴志1,2(), 韦明洋1,2, 曾德铭1,2, 康家豪1,2, 李阳1,2, 刘凯铭1,2, 李钥3, 洪海涛3, 周红飞3   

  1. 1 油气藏地质及开发工程全国重点实验室, 西南石油大学,四川成都 610500
    2 西南石油大学地球科学与技术学院,四川成都 610500
    3 中国石油西南油气田公司勘探开发研究院,四川成都 610051
  • 收稿日期:2024-02-25 修回日期:2024-05-31 出版日期:2025-06-01 发布日期:2025-05-29
  • 通讯作者: 王兴志,男,1964年生,博士,教授,主要从事储层沉积学等方面的教学与研究工作。E-mail: wxzswpu@163.com。
  • 作者简介:

    陈旺,男,1999年生,西南石油大学在读硕士研究生,研究方向为沉积学与储层地质学。E-mail:

  • 基金资助:
    *中国石油—西南石油大学创新联合体项目(2020CX050000); 四川省自然科学基金重点项目(24NSFSC0093)

Lithofacies types and reservoir characteristics of continental shale in the Dongyuemiao Member of Jurassic Ziliujing Formation, eastern Sichuan Basin

CHEN Wang1,2(), WANG Xingzhi1,2(), WEI Mingyang1,2, ZENG Deming1,2, KANG Jiahao1,2, LI Yang1,2, LIU Kaiming1,2, LI Yue3, HONG Haitao3, ZHOU Hongfei3   

  1. 1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China
    2 School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China
    3 Research Institute of Exploration and Development,PetroChina Southwest Oil & Gasfield Company,Chengdu 610051,China
  • Received:2024-02-25 Revised:2024-05-31 Online:2025-06-01 Published:2025-05-29
  • Contact: WANG Xingzhi,born in 1964,is a Ph.D. and professor. He is mainly engaged in teaching and research in reservoir sedimentology. E-mail: wxzswpu@163.com.
  • About author:

    CHEN Wang,born in 1999,is a master's student at Southwest Petroleum University. His research direction is sedimentology and reservoir geology. E-mail: .

  • Supported by:
    Innovation Consortium Project between China National Petroleum Corporation and Southwest Petroleum University(2020CX050000); Natural Science Foundation of Sichuan Province(24NSFSC0093)

摘要:

页岩储集层物性是页岩油气富集机理的关键,为确定陆相页岩不同岩相类型的储集层物性及其主控因素,以川东地区侏罗系东岳庙段页岩为研究对象,在岩相划分的基础上,利用扫描电镜、低温氮气吸附等手段,研究其储集空间类型、储集层物性及主控因素。研究结果表明: (1)川东地区东岳庙段陆相页岩矿物成分以黏土矿物和石英为主,方解石次之,并含少量长石、白云石、黄铁矿和菱铁矿。研究区页岩主要为高—中碳黏土质页岩(Ⅰ2)、含—中碳混合质页岩(Ⅱ1)、中—低碳粉砂(黏土)质混合质页岩(Ⅱ2)和含—低碳泥质粉砂岩(Ⅲ2)4类岩相。(2)页岩的储集空间主要为微孔隙和微裂缝。前者主要为黏土矿物晶间孔,次为有机质孔以及局部岩相中发育的介壳溶蚀孔; 后者主要为页理缝和介壳边缘缝。(3)川东地区页岩中高有机质丰度(>1%)、高黏土矿物含量(>40%)和适量的碳酸盐矿物含量(8%~12%)有利于页岩孔隙的发育,而高石英+长石矿物含量(>50%)和过高或过低的碳酸盐矿物含量(>12%或<8%)不利于页岩孔隙的发育。(4)含—中碳粉砂(黏土)质混合质页岩(Ⅱ2)是最有利的储集层发育岩相,高—中碳黏土质页岩(Ⅰ2)次之,中—低碳混合质页岩(Ⅱ1)较差,含—低碳泥质粉砂岩(Ⅲ2)最差。结合东岳庙段岩相纵向分布规律,认为东二亚段中上部是川东地区储集层优选层位。

关键词: 陆相页岩, 岩相类型, 储集层特征, 东岳庙段, 川东地区

Abstract:

The physical properties of shale reservoirs are crucial to the enrichment mechanism of shale oil and gas. This study focuses on investigating the reservoir's physical properties and the key factors controlling various lithofacies of continental shale in the Jurassic Dongyuemiao shale in the eastern Sichuan Basin. On the basis of lithofacies division,the research employs core observation,scanning electron microscope,low-temperature nitrogen adsorption,and other methods to analyze the reservoir space type,physical properties,and the primary controlling factors. The study findings reveal that: (1)The Dongyuemiao Member shale in the eastern Sichuan Basin are primarily composed of clay minerals and quartz,followed by calcite,and minor amounts of feldspar,dolomite,pyrite,and rhodochrosite. Four main lithofacies are identified in the study area: high-medium total organic carbon(TOC)argillaceous shale(Ⅰ2),medium TOC and TOC bearing mixed shale(Ⅱ1),medium-low TOC silt(argillaceous)mixed shale(Ⅱ2),and low TOC and TOC bearing argillaceous siltstone(Ⅲ2). (2)The shale reservoir space is mainly composed of micropores and microfractures. The micropores are dominated by intergranular pores between clay minerals,followed by pores within organic matter and,locally,shell dissolution pores. Microfractures mainly include bedding fractures and edge fractures around shell fragments. (3)High organic matter abundance(>1%),high content of clay minerals(>40%),and moderate carbonate mineral content(8%~12%)in the shale of the study area are conducive to pore development. In contrast,high quartz and feldspar mineral content(>50%)and either excessive or insufficient carbonate mineral content(>12% or <8%)hinder shale pore development. (4)Among the lithofacies types,the medium-low TOC silty(argillaceous)mixed shale(Ⅱ2) is the most favorable for reservoir development,followed by high-medium TOC argillaceous shale(Ⅰ2). The medium TOC and TOC bearing mixed shale(Ⅱ1) is less favorable,while the low TOC and TOC bearing argillaceous siltstone(Ⅲ2) is the least favorable. Based on the vertical distribution of lithofacies,the middle to upper intervals of the Dong 2 sub-member are identified as the most favorable reservoir development zones in the study area.

Key words: continental shale, lithofacies types, reservoir characteristics, Dongyuemiao Member, eastern Sichuan Basin

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