天然气地质学

四川盆地及其周缘典型地区龙潭组页岩岩相划分对比及特征

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  • 1.中国地质大学(北京)能源学院/自然资源部页岩气资源战略评价重点实验室,北京 100083
    2.中国地质调查局油气资源调查中心,北京 100083
    3.中国石化石油勘探开发研究院,北京 100083
何燚(1992-),男,湖北十堰人,硕士研究生,主要从事非常规油气地质评价研究.E-mail:2316595340@qq.com.

收稿日期: 2020-07-19

  修回日期: 2020-09-15

  网络出版日期: 2021-03-10

基金资助

国家自然科学基金项目(41972132);国家科技重大专项“大型油气田及煤层气开发复杂油气田地质与高效钻采新技术”项目“陆相深水储集体成因机制与储层地质评价”课题(2017ZX05009-002);中央高校基本科研业务费专项资金联合资助

Lithofacies division and comparison and characteristics of Longtan Formation shale in typical areas of Sichuan Basin and its surrounding

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  • 1.China University of Geosciences (School of Energy)/Key Laboratory of Strategic Evaluation of Shale Gas Resources,Ministry of Natural Resources,Beijing 100083,China
    2.Petroleum Resources Survey Center,China Geological Survey,Beijing 100083,China
    3.Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China

Received date: 2020-07-19

  Revised date: 2020-09-15

  Online published: 2021-03-10

Supported by

The National Natural Science Foundation of China(41972132);The China National Science and Technology Major Project(2017ZX05009-002);The Fundamental Research Funds for the Central Universities

摘要

海陆过渡相页岩类型多、有机质类型复杂,既不完全同于陆相也不完全同于海相页岩特征,探讨海陆过渡相页岩岩相及其特征是进一步认识页岩气储集空间、赋存机理和富集规律的基础和前提。以四川盆地及其周缘典型地区二叠系龙潭组海相M1井和陆相DC1井页岩为研究对象,结合岩心观察、普通光学薄片观察、氩离子抛光扫描电镜观察等实验手段,对页岩岩相进行划分对比并描述其特征。结果表明:四川盆地及其周缘典型地区龙潭组页岩岩相按照矿物含量可划分为5个大类,分别为黏土质页岩相、钙质页岩相、硅质页岩相、钙质混合页岩相和硅质混合页岩相。根据有机质丰度进一步划分出8个小类,分别为特高有机质硅质页岩相、特高有机质硅质混合页岩相、特高有机质黏土质页岩相、高有机质硅质页岩相、高有机质黏土质页岩相、中有机质钙质混合页岩相、中有机质黏土质页岩相和低有机质钙质页岩相。其中黏土质页岩相、硅质页岩相和硅质混合页岩相有机质丰度高为有利产层;钙质和钙质混合页岩相有机质丰度低为不利产层;黏土质页岩相是页岩岩相中最为普遍发育的岩相;海陆过渡相的黏土质页岩相页岩有机质丰度高于海相的黏土质页岩相页岩。

本文引用格式

何燚, 唐玄, 单衍胜, 刘光祥, 谢皇长, 马子杰 . 四川盆地及其周缘典型地区龙潭组页岩岩相划分对比及特征[J]. 天然气地球科学, 2021 , 32(2) : 174 -190 . DOI: 10.11764/j.issn.1672-1926.2020.09.009

Abstract

There are many types of transitional facies shale, and the types of organic matter are complex. They are neither completely the same as continental nor completely the same as the characteristics of marine shale. Discussing transitional shale facies and their characteristics is a further understanding of shale gas storage space. This paper takes the Well M1 and Well DC1 shale of Permian Longtan Formation in the Sichuan Basin and its surrounding areas as the research objects , combined with core observation, ordinary optical thin section observation, and argon ion polishing scanning electron microscope observation. The lithofacies are divided and compared and their characteristics are described. The results indicate that the shale lithofacies of the Longtan Formation in the typical areas of the Sichuan Basin and its periphery can be divided into five major categories according to the mineral content, which are clay shale facies, calcareous shale facies, siliceous shale facies, calcareous mixed shale facies, siliceous mixed shale facies. According to the abundance of organic matter, eight sub-categories are further divided into ultra-high organic matter siliceous shale facies, ultra-high organic matter siliceous mixed shale facies, ultra-high organic matter clay shale facies, high organic matter siliceous shale facies, high-organic clay shale facies, medium-organic calcareous shale facies, medium-organic clay shale facies and low-organic calcareous shale facies. Clay shale facies, siliceous shale facies and siliceous mixed shale lithofacies with high abundance of organic matter is favorable production zone, while calcareous and calcareous mixed shale facies with low abundance of organic matter is an unfavorable production zone. Clay shale facies is the most commonly developed lithofacies in shale facies. The abundance of organic matter in clay facies shale facies is higher than that of marine clay shale facies shale.

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