岩性油气藏 ›› 2022, Vol. 34 ›› Issue (4): 53–65.doi: 10.12108/yxyqc.20220406

• 地质勘探 • 上一篇    下一篇

川中地区侏罗系大安寨段页岩岩相类型及储层特征

康家豪1,2, 王兴志1,2, 谢圣阳1,2, 曾德铭1,2, 杜垚3, 张芮4, 张少敏4, 李阳4   

  1. 1. 油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500;
    2. 西南石油大学 地球科学与技术学院, 成都 610500;
    3. 中国石油西南油气田公司 勘探事业部, 成都 610041;
    4. 中国石油西南油气田公司 勘探开发研究院, 成都 610041
  • 收稿日期:2021-11-03 修回日期:2021-12-29 出版日期:2022-07-01 发布日期:2022-07-07
  • 通讯作者: 王兴志(1964-),男,博士,教授,主要从事储层沉积学等方面的教学与研究工作。Email:wxzswpi@163.com。 E-mail:wxzswpi@163.com
  • 作者简介:康家豪(1997-),男,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。地址:(610500)四川省成都市新都区新都大道8号。Email:kjh1371846074@163.com。
  • 基金资助:
    中国石油-西南石油大学创新联合体项目“四川盆地侏罗系湖相页岩油地质理论技术研究与有利区评价”（编号：2020CX050000）资助

Lithofacies types and reservoir characteristics of shales of Jurassic Da'anzhai member in central Sichuan Basin

KANG Jiahao1,2, WANG Xingzhi1,2, XIE Shengyang1,2, ZENG Deming1,2, DU Yao3, ZHANG Rui4, ZHANG Shaomin4, LI Yang4   

  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. Exploration Division, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    4. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China
  • Received:2021-11-03 Revised:2021-12-29 Online:2022-07-01 Published:2022-07-07

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摘要： 通过岩心薄片鉴定、扫描电镜观察、X射线衍射分析与TOC含量检测等技术，精细划分了川中地区侏罗系大安寨段页岩岩相类型，并对各岩相的储集空间类型、物性和含气性等特征进行了分析，确认了优势岩相，并结合岩相与沉积相的纵向发育特征，指出了优势开发层段。研究结果表明：①川中地区大安寨段页岩储集空间以与黏土矿物相关孔隙和颗粒边缘孔为主，孔隙度为0.31%~8.55%，平均为3.97%；渗透率为0.001~12.185 mD，平均为0.659 mD；气的质量体积一般高于1.0 m3/t，其分布特征与孔隙度具有高度一致性。②研究区大安寨段页岩岩相可划分为6个大类13个小类，其中中高有机碳含量的介壳灰质黏土质页岩岩相有机质丰度、脆性矿物含量、孔隙度和含气量均最高，为最具优势的岩相，中高有机碳含量的粉砂质黏土质页岩岩相其次，中高有机碳含量的黏土质页岩岩相虽然其有机质丰度较高，但裂缝欠发育，具有一定的地质勘探潜力。③研究区大安寨段优势岩相主要分布在大二亚段的半深湖亚相，这也是有利的勘探方向。

关键词: 介壳灰质黏土质页岩, 颗粒边缘孔, 陆相页岩, 储集空间, 半深湖亚相, 大安寨段, 侏罗系, 川中地区

Abstract: Based on the observation of cores,thin sections,scanning electron microscope and the results of X-ray diffraction analysis and TOC content detection,the shale lithofacies of Jurassic Da'anzhai member in central Sichuan Basin was divided,and reservoir space types,physical properties and gas-bearing properties of each lithofacies were analyzed to confirm the dominant lithofacies. Combined with the vertical development characteristics of shale lithofacies and sedimentary facies,the dominant development zones were defined. The results show that:(1)The shale reservoir space of Da' anzhai member is mainly composed of clay mineral related pores and particle edge pores. The porosity ranges from 0.31% to 8.55%,with an average of 3.97%,and the permeability is 0.001-12.185 mD,with an average of 0.659 mD. The total gas content of shale is generally greater than 1.0 m3/t, and its distribution is highly consistent with porosity.(2)The shale lithofacies of Da'anzhai member in the study area can be divided into 6 categories and 13 sub-categories. Among them,shell limy clay shale lithofacies with medium-high organic carbon content has the highest organic matter abundance,brittle mineral content,porosity and gas content,which is the most dominant lithofacies,followed by silty clay shale lithofacies,clay shale lithofacies has high organic matter abundance but underdeveloped fractures,which has geological exploration potential.(3)The dominant lithofacies of Da'anzhai member in the study area is mainly distributed in the semi-deep lacustrine subfacies of Da 2 sub-member which is a favorable exploration zone.

Key words: shell limy clay shale, particle edge pores, continental shale, reservoir space, semi-deep lacustrine subfacies, Da'anzhai member, Jurassic, central Sichuan Basin

中图分类号: 

  • TE132
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