石油勘探与开发 >

2021 , Vol. 48 >Issue 6: 1137 - 1149

DOI: https://doi.org/10.11698/PED.2021.06.06

油气勘探

海陆过渡相黑色页岩优势岩相类型及成因机制——以鄂尔多斯盆地东缘二叠系山西组为例

  • 武瑾 ,
  • 王红岩 ,
  • 施振生 ,
  • 王琦 ,
  • 赵群 ,
  • 董大忠 ,
  • 李树新 ,
  • 刘德勋 ,
  • 孙莎莎 ,
  • 邱振
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  • 1.中国石油勘探开发研究院,北京 100083;
    2.国家能源页岩气研发（实验）中心,北京 100083;
    3.中国石油天然气股份有限公司对外合作经理部,北京 100007;
    4.中国石油煤层气有限责任公司,北京 100028
武瑾（1988-）,女,内蒙古呼伦贝尔人,博士,中国石油勘探开发研究院高级工程师,主要从事页岩气开发地质研究。地址：北京市海淀区学院路20号,中国石油勘探开发研究院非常规研究所,邮政编码：100083。E-mail：wujinouc@petrochina.com.cn

收稿日期: 2021-01-29

  修回日期: 2021-06-25

  网络出版日期: 2021-11-25

基金资助

国家科技重大专项“四川盆地及周缘页岩气形成富集条件、选区评价技术与应用”（2017ZX05035）

收起

Favorable lithofacies types and genesis of marine-continental transitional black shale: A case study of Permian Shanxi Formation in the eastern margin of Ordos Basin, NW China

  • WU Jin ,
  • WANG Hongyan ,
  • SHI Zhensheng ,
  • WANG Qi ,
  • ZHAO Qun ,
  • DONG Dazhong ,
  • LI Shuxin ,
  • LIU Dexun ,
  • SUN Shasha ,
  • QIU Zhen
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  • 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. National Energy Shale Gas R & D Experimental Center, Beijing 100083, China;
    3. PetroChina Foreign Cooperation Administration Department, Beijing 100007, China;
    4. PetroChina Coalbed Methane Company Limited, Beijing 100028, China

Received date: 2021-01-29

  Revised date: 2021-06-25

  Online published: 2021-11-25

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摘要

基于岩心观察结果,综合利用薄片鉴定、X-衍射矿物分析、场发射扫描电镜、低温气体吸附及高压压汞等技术手段,对鄂尔多斯盆地东缘二叠系山西组山23亚段页岩岩相进行系统分析。研究表明,山西组山23亚段发育低TOC黏土质页岩相（C-L）、低TOC硅质页岩相（S-L）、中TOC硅质页岩相（S-M）、中TOC混合质页岩相（M-M）、高TOC硅质页岩相（S-H）、高TOC黏土质页岩相（C-H）6种岩相。其中,S-H岩相为储集条件最优的岩相,S-M、M-M岩相次之。C-L、C-H岩相位于山23亚段中上部,普遍发育于潮控三角洲相;S-L、S-M、S-H和M-M 4类岩相位于山23亚段下部,发育于潮控河口海湾相。S-H、S-M和M-M岩相以有机质孔缝和矿物粒间孔为主,发育黏土矿物层间孔、黄铁矿晶间孔、矿物溶蚀孔,孔隙结构整体优;C-L、S-L岩相发育矿物粒间孔、黏土矿物层间孔缝及少量有机质微孔,孔隙结构较差;C-H岩相发育有机质微孔及少量黏土矿物层间孔缝,微孔孔隙结构优,中孔、宏孔孔隙结构差。优势岩相的形成受沉积环境和成岩作用共同控制,浅海海湾—潟湖沉积环境有利于Ⅱ2型干酪根形成,易于产生大量蜂窝状有机质气泡孔,富生物成因硅有利于各类孔隙的保存,并增强了储集层的可压裂性。图11表1参23

关键词： 海陆过渡相; 页岩气; 优势岩相; 储集层特征; 二叠系山西组; 鄂尔多斯盆地

本文引用格式

武瑾 , 王红岩 , 施振生 , 王琦 , 赵群 , 董大忠 , 李树新 , 刘德勋 , 孙莎莎 , 邱振 . 海陆过渡相黑色页岩优势岩相类型及成因机制——以鄂尔多斯盆地东缘二叠系山西组为例[J]. 石油勘探与开发, 2021 , 48(6) : 1137 -1149 . DOI: 10.11698/PED.2021.06.06

Abstract

Based on core description, thin section identification, X-ray diffraction analysis, scanning electron microscopy, low-temperature gas adsorption and high-pressure mercury intrusion porosimetry, the shale lithofacies of Shan23 sub-member of Permian Shanxi Formation in the east margin of Ordos Basin was systematically analyzed in this study. The Shan23 sub-member has six lithofacies, namely, low TOC clay shale (C-L), low TOC siliceous shale (S-L), medium TOC siliceous shale (S-M), medium TOC hybrid shale (M-M), high TOC siliceous shale (S-H), and high TOC clay shale (C-H). Among them, S-H is the best lithofacies, S-M and M-M are the second best. The C-L and C-H lithofacies, mainly found in the upper part of Shan23 sub-member, generally developed in tide-dominated delta facies; the S-L, S-M, S-H and M-M shales occurring in the lower part of Shan23 sub-member developed in tide-dominated estuarine bay facies. The S-H, S-M and M-M shales have good pore structure and largely organic matter pores and mineral interparticle pores, including interlayer pore in clay minerals, pyrite intercrystalline pore, and mineral dissolution pore. C-L and S-L shales have mainly mineral interparticle pores and clay mineral interlayer pores, and a small amount of organic matter pores, showing poorer pore structure. The C-H shale has organic micro-pores and a small number of interlayer fissures of clay minerals, showing good micro-pore structure, and poor meso-pore and macro-pore structure. The formation of favorable lithofacies is jointly controlled by depositional environment and diagenesis. Shallow bay-lagoon depositional environment is conducive to the formation of type II2 kerogen which can produce a large number of organic cellular pores. Besides, the rich biogenic silica is conducive to the preservation of primary pores and enhances the fracability of the shale reservoir.

Key words： marine-continental transitional facies; shale gas; favorable lithofacies; reservoir characteristics; Permian Shanxi Formation; Ordos Basin

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