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天然气地球科学

• 非常规天然气 • 上一篇    

淮南煤田下二叠统山西组煤系页岩气储层特征及物性成因

徐宏杰，胡宝林，刘会虎，郑建斌，张文永，郑凯歌   

  1. 1.安徽理工大学地球与环境学院，安徽 淮南 232001；
    2.安徽省煤田地质局，安徽 合肥 230088；
    3.中煤科工集团西安研究院有限公司，陕西 西安 710054
  • 收稿日期:2014-09-17 修回日期:2014-11-02 出版日期:2015-06-10 发布日期:2015-06-10
  • 作者简介:徐宏杰（1981-），男，河南潢川人，讲师，博士，主要从事瓦斯地质与煤层气勘探开发研究. E-mail：xiaonzm@163.com.
  • 基金资助:

    国家自然科学基金项目（编号：41402140；41302129）；安徽省页岩气资源调查评价项目(编号：2012-g-17)；安徽省自然科学基金项目（编号：1408085QE88）联合资助.

Reservoir Characteristics and Its Physical Origin of Shale Gas in Coal Measure in the Lower Permian Shanxi Formation in Huainan Coal Field

XU Hong-jie，HU Bao-lin，LIU Hui-hu，ZHENG Jian-bin，ZHANG Wen-yong，ZHENG Kai-ge   

  1. 1.School of Earth Science and Environmental Engineering,Anhui University of Science and Technology,Huainan 232002,China;
    2.Anhui Bureau of Coal Geological Exploration,Hefei 230088,China;
    3.China Coal Technology and Engineering Group Xi′an Research,Xi′an 710054,China
  • Received:2014-09-17 Revised:2014-11-02 Online:2015-06-10 Published:2015-06-10

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摘要：

煤系页岩气是煤系非常规气的一种，煤系泥页岩具备较好的聚集和成藏潜力，研究煤系泥页岩储层特征对于进一步确认煤系非常规气共生成藏与共采具有重要意义。以淮南煤田下二叠统山西组为例开展研究，结果表明：山西组厚约72m，泥岩约占25%，泥岩中石英矿物含量在29.2%～36.7%之间，主要为陆源碎屑外源成因。山西组有机碳含量高，TOC含量为0.37%～8.87%，有机质以Ⅱ2型干酪根为主；RO值变化范围为0.83%～1.32%，整体为中成熟阶段。泥岩压汞孔隙度为0.87%～4.29%，脉冲渗透率区间为(3.16~8.88)×10-7μm2，平均为4.82×10-7μm2，二者线性关系较好。扫描电镜下山西组泥岩微裂缝较为发育，包括石英颗粒边缘延伸微裂缝、颗粒内部平行线形裂缝和黏土矿物内部发育的弯曲状不规则裂缝，微孔隙主要包括粒间孔和粒内孔，孔隙直径为2μm～50nm。有机碳含量、热演化程度对微孔隙发育的促进作用不明显，伊/蒙混层在黏土矿物组成中占有较大比例，可能是微孔隙发育的主要贡献者。不同的沉积微相类型发育了不同的岩相类型，是研究区山西组煤系页岩气储层物性形成的沉积基础。

关键词: 煤系页岩气, 储层特征, 物性成因, 下二叠统山西组, 淮南煤田

Abstract:

Shale gas in coal measures is one of the important types,and the shale in coal measures holds favorable ability of gas accumulation and enrichment potential.It has important significance of research for shale reservoir characteristics in coal measure strata to confirm the coexistence and co-exploration of unconventional gas.As a case of the Lower Permian Shanxi Formation in Huainan Coal Field,the results show that the thickness of the Shanxi Formation shale is about 72m,and the thickness of mudstone accounts for about 25%.The quartz mineral content varies from 29.2% to 36.7% in the mudstone with terrigenous origin.Shanxi Formation contains 0.37% to 8.87% of TOC.The organic matter is moderate mature with RO of 0.83%-1.32% and dominated by type Ⅱ2-kerogen.Porosity of the mudstone measured by Hg intrusion ranges from 0.87% to 4.29%,and pulse permeability ranges from 0.31×10-3μm2  to 0.91×10-3μm2   with an average of 0.54×10-3μm2 .The linear relationship of porosity and pulse permeability is generally better.The development of micro-fracture observed in the mudstone includes micro-fracture extended at the edge of quartz grain,particle internal parallel linear fracture and bent irregular fracture of the internal clay minerals.The micro-porosity dominated by inter-granular and intra-granular pores,with pore size ranging from 2μm to 50nm.The promoting effect of TOC and thermal evolution to micro pore is not obvious,but the mixed-layer minerals of illite and smectite is the main contributor to pores with a large proportion in the composition of clay mineral content.Different types of sedimentary micro-facies could develop different lithic facies,and it is the sedimentary basis of the physical properties of shale gas reservoir  from Shanxi Formation in the study area.

Key words: Shale gas in coal measure, Reservoir characteristics, Physical origin, Lower Permian Shanxi Formation, Huainan Coal Field

中图分类号: 

  • TE122.2

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