川南地区龙马溪组页岩气储层微孔隙结构特征

赵佩,李贤庆，田兴旺，苏桂萍，张明扬，郭曼，董泽亮，孙萌萌，王飞宇

doi:10.11764/j.issn.1672-1926.2014.06.947

天然气地球科学 >

2014 , Vol. 25 >Issue 6: 947 - 956

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.06.947

非常规天然气

川南地区龙马溪组页岩气储层微孔隙结构特征

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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

赵佩(1989-)，女，湖北仙桃人，硕士研究生，主要从事页岩气地质、地球化学研究. E-mail:zp2682@qq.com.

收稿日期: 2013-11-06

修回日期: 2014-03-22

网络出版日期: 2014-06-10

基金资助

国家重点基础研究计划(“973”)课题(编号:2012CB214702)；教育部高等学校博士学科点基金项目(编号:20110023110017)；国家科技重大专项(编号:2011ZX05007-002)联合资助.
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Study on Micropore Structure Characteristics of Longmaxi FormationShale Gas Reservoirs in the Southern Sichuan Basin

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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 date: 2013-11-06

Revised date: 2014-03-22

Online published: 2014-06-10

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摘要

应用扫描电子显微镜、高压压汞法、N₂和CO₂气体吸附法，对川南地区下志留统龙马溪组海相页岩气储层孔隙微观特征和孔隙结构进行了研究，探讨了页岩孔隙发育的主要影响因素。结果表明，川南地区龙马溪组海相页岩样品中发育多种类型微观孔隙，常见有黏土矿物粒间孔、黄铁矿晶间孔、碳酸盐颗粒溶蚀孔、生物碎屑粒内孔、颗粒边缘溶蚀孔和有机质孔；龙马溪组富有机质页岩发育大量的微米—纳米级孔隙，为页岩气赋存提供了储集空间。龙马溪组页岩样品中孔隙以微孔和介孔为主，宏孔较少；孔隙结构形态主要为平板狭缝型孔、圆柱孔和混合型孔，孔径为0.4～1nm、3～20nm；微孔和介孔占孔隙总体积的78.17%，占比表面积的83.92%，是龙马溪组页岩储气空间的主要贡献者。页岩有机碳含量、成熟度和矿物成分含量均会影响川南地区龙马溪组海相页岩孔隙的发育，总体上页岩孔隙体积随有机碳含量增加而增大；页岩孔隙度随成熟度增加而降低；黏土矿物和脆性矿物含量对页岩孔隙发育也有一定的影响。
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关键词： 页岩气储层; 孔隙特征; 海相页岩; 气体吸附; 龙马溪组; 川南地区

本文引用格式

赵佩,李贤庆，田兴旺，苏桂萍，张明扬，郭曼，董泽亮，孙萌萌，王飞宇 . 川南地区龙马溪组页岩气储层微孔隙结构特征[J]. 天然气地球科学, 2014 , 25(6) : 947 -956 . DOI: 10.11764/j.issn.1672-1926.2014.06.947

Abstract

Based on the scanning electron microscopy,high pressure mercury-injection,N2 and CO2 gas adsorption methods,the micropore characteristics and structures of shale samples from the Lower Silurian Longmaxi Formation marine shale gas reservoirs in the southern Sichuan Basin were studied,and their influencing factors of pores development were also discussed.The results showed that there are various types of micropores in the Longmaxi Formation marine shale samples in the southern Sichuan Basin,mainly including clay inter-granular pore,pyrite crystal particle pore,bioclast inter-granular pore,carbonate grain dissolved pore,particle edge pore and organic pore.The main pore types in these shale samples are micropores and mesopores.A large amount of micro-nano scale pores are developed in the organic-rich shales,which provided storage space for shale gas.The structure of shale pores is dominated by the parallel-plate pores,cylinder pores and mixed pores.The sizes of these pores mainly occur in a range of 0.4-1nm and 3-20nm.In the Longmaxi Formation marine shale,the micropore and mesopore account for 78.17% of the total volume of pores and 83.92% of the total specific surface area.Both micropore and mesopore are the main contribution of storage space for shale gas.The organic carbon content,maturity (R_O) of organic matter and mineral component content all influence pore development of the marine shale gas reservoirs.In general,the pore volume of shale increases with the increase of organic carbon content.The porosity of shale reduces as the vitrinite reflectance (R_O) increases.The content of clays and brittle minerals in the organic-rich shale also has a certain influence on the development of shale pores.

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Key words： Shale gas reservoirs; Pore characteristics; Marine shale; Gas adsorption; Longmaxi Formation; The southern Sichuan Basin.

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