天然气地球科学

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川南地区下古生界页岩气储层孔隙特征研究

李贤庆,王元,郭曼,张吉振,赵佩,徐红卫,杨杰,王飞宇   

  1. 1.中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京 100083;
    2.中国矿业大学(北京)地球科学与测绘工程学院,北京100083;
    3.中国石油大学(北京)油气资源与探测国家重点实验室,北京102249;
    4.中国石油大学(北京)地球科学学院,北京102249
  • 收稿日期:2015-03-28 修回日期:2015-05-22 出版日期:2015-08-10 发布日期:2015-08-10
  • 作者简介:李贤庆(1967-),男,浙江富阳人,教授,博士生导师,主要从事煤油气地质、有机地球化学、有机岩石学研究及教学工作. E-mail:Lixq@cumtb.edu.cn.
  • 基金资助:

    国家重点基础研究计划(“973”)课题(编号:2012CB214702);国土资源部公益性行业科研专项基金项目(编号:201311022);教育部高等学校博士学科点基金项目(编号:20110023110017)联合资助.

Pore Characteristics of Shale Gas Reservoirs from the Lower Paleozoic in the South of Sichuan Basin

LI Xian-qing,WANG Yuan,GUO Man,ZHANG Ji-zhen,ZHAO Pei,XU Hong-wei,YANG Jie,WANG Fei-yu   

  1. 1.State Key Laboratory of Coal Resources and Safe Mining,China University of Miningand Technology(Beijing),Beijing 100083,China;
    2.College of Geoscience and Surveying Engineering,China University of Miningand Technology(Beijing),Beijing 100083,China;
    3.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;
    4.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China
  • Received:2015-03-28 Revised:2015-05-22 Online:2015-08-10 Published:2015-08-10

摘要:

基于钻井资料、岩心样品实验数据,运用有机地球化学、有机岩石学和储层孔隙分析的多种实验方法,对川南地区下古生界筇竹寺组和龙马溪组2套页岩有机质特征、孔隙度、页岩气储层微观孔隙特征与孔隙结构进行了研究。结果表明,川南地区下古生界页岩有机碳含量较高(多数TOC>2.0%)、热成熟度高(ROm=2.3%~3.8%)、孔隙度低(1.16%~6.87%);筇竹寺组页岩有机碳含量和热成熟度高于龙马溪组页岩,而其孔隙度低于龙马溪组页岩;下古生界龙马溪组和筇竹寺组页岩存在粒间孔、溶蚀孔、晶间孔、粒内孔和有机质孔等多种孔隙类型;龙马溪组页岩中微米—纳米级孔隙较筇竹寺组页岩发育,常见有机质孔、粒间孔和粒内孔,是页岩气赋存的主要储集空间;下古生界页岩微观孔隙以微孔和介孔为主,宏孔较少,筇竹寺组页岩微孔+介孔孔容比例占总孔容的83.92%,龙马溪组页岩微孔+介孔孔容比例占总孔容的78.17 %,表明微孔和介孔是川南地区下古生界页岩气储层纳米级孔隙的主要贡献者。

关键词: 川南地区, 孔隙特征, 页岩气储层, 下古生界, 海相页岩

Abstract:

Based on the data from drilling and core samples,the characteristics of organic matter,porosity,microscopic pore and pore structure from the Lower Paleozoic Qiongzhusi and Longmaxi formations marine shale gas reservoirs in the south of Sichuan basin were studied,by using a lot of experimental methods such as organic geochemistry,organic petrology,reservoir pore analysis.The results show that the Lower Paleozoic marine shale in the south of Sichuan basin is characterized by high organic carbon content(most TOC>2.0%),high thermal maturity(ROm=2.3%-3.8%),and low porosity(1.16%-6.87%).The organic carbon content and thermal maturity of the Qiongzhusi Formation shale is higher than those of the Longmaxi Formation shale,while the porosity of the Qiongzhusi Formation shale is lower than that of the Longmaxi Formation shale.There are inter-granular pore,dissolved pore,crystal particle pore,particle edge pore and organic pore in the Lower Paleozoic Qiongzhusi Formation and Longmaxi Formation shale samples.More micro-nano scale pores are developed in the Longmaxi Formation shales than those in the Qiongzhusi Formation shales.The inter-granular pore,dissolved pore and organic pore are most common,which are main storage space for shale gas.The microscopic pores in the Lower Paleozoic shale are mainly composed of micropore and mesopore,and a little micropore.The micropore and mesopore in the Qiongzhusi Formation shale account for 83.92% of the total pore volume.The micropore and mesopore in the Longmaxi Formation shale account for 78.17% of the total pore volume.Thus,micropore and mesopore are the main contribution of microscopic pores in the Lower Paleozoic shale gas reservoir in the south of Sichuan Basin.

Key words: The south of Sichuan Basin, Pore characteristics, Shale gas reservoir, The Lower Paleozoic, Marine shale

中图分类号: 

  • TE122.2

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