天然气地球科学

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鄂西下志留统龙马溪组页岩储集特征

王宏坤,吕修祥,王玉满,慕瑄,张琰,钱文文,陈佩佩   

  1. 1.中国石油大学(北京)地球科学学院,北京10229;
    2.中国石油大学(北京)油气资源与探测国家重点实验室,北京10229;
    3.中国石油勘探开发研究院,北京 100083
  • 收稿日期:2017-07-16 修回日期:2018-01-19 出版日期:2018-03-10 发布日期:2018-03-10
  • 通讯作者: 吕修祥(1963-),男,湖北钟祥人,教授,博士生导师,主要从事油气藏形成机理与分布规律研究. E-mail:luxx@cup.edu.cn.
  • 作者简介:王宏坤(1992-),男,湖北荆门人,硕士研究生,主要从事油气藏形成机理与分布规律研究.E-mail:wanghk007@foxmail.com.
  • 基金资助:
    国家自然科学基金(编号:1572100);国家重点基础研究发展计划(973)项目(编号:2013CB228001);中国石油页岩气资源评价与战略选区项目(编号:kt2017-10-02)联合资助.
     

The reservoir characteristics of Lower Silurian Longmaxi Formation in western Hubei

Wang Hong-kun,Lü Xiu-xiang,Wang Yu-man,Mu Xuan,Zhang Yan,Qian Wen-wen,Chen Pei-pei
 
  

  1. 1.China University of Petroleum(Beijing),Beijing 10229,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 10229,China;
    3.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China
  • Received:2017-07-16 Revised:2018-01-19 Online:2018-03-10 Published:2018-03-10

摘要:

鄂西下志留统龙马溪组(含上奥陶统五峰组)是中国南方四川盆地页岩气勘探的重点区带。应用双孔隙介质孔隙度数学模型,以钻井资料为基础,对鄂西龙马溪组页岩基质孔隙构成和裂缝发育状况进行了定量评价,初步发现鄂西龙马溪组富有机质页岩储集条件具有3大特征:①孔隙类型总体以基质孔隙为主,仅在局部深度点/段发育微裂缝;②总孔隙度总体较小,仅为川南龙马溪组的1/2,且孔隙构成以黏土矿物晶间孔隙和有机质孔隙为主体;③基质孔隙体积大量减少和含气性变差的首要原因与川南筇竹寺组基本相似,即为黑色页岩热成熟度过高并出现有机质碳化特征,有机质碳化所控制的超低电阻富有机质页岩分布区是页岩气勘探的高风险区。由此推断,利川—恩施一带(即A井—HY1井区一带)为有机质严重碳化区,勘探风险高;石柱—万县复向斜东侧(即JS1井区周边)为有机质弱碳化区,勘探风险较高;EY1井以南和C7井以西的广大地区为有机质未碳化区,即页岩气勘探潜在有利区。

关键词: 页岩储集特征, 有机质碳化, 龙马溪组, 鄂西

Abstract:

The Lower Silurian Longmaxi Formation(containing the Upper Ordovician Wufeng Formation) in western Hubei is the key area of shale gas exploration in Sichuan Basin.Based on the drilling data,the matrix pore structure and fracture of the Longmaxi Formation shale in western Hubei have been quantitatively evaluated in the paper applied for a dual-porosity medium porosity interpretation model,which preliminarily found three reservoir characteristics in the organic-rich shale of Longmaxi Formation in western Hubei.(1)The pore type is dominated by matrix porosity with micro-fractures developed only at local depth points or segments.(2)The total porosity is small and about half of the Longmaxi Formation in southern Sichuan,whose pore types are mainly composed of the intercrystalline pores of clay minerals and organic pores.(3)The primary reason for the significant decrease of matrix pore volume and poor gas-bearing properties is basically similar to the Qiongzhusi Formation in southern Sichuan,which is that the thermal maturity of black shale is too high and carbonation characteristics of organic matter have appeared,and the distribution area of ultra-low resistivity organic-rich shale controlled by organic carbonization is a high-risk area for shale gas exploration.It is inferred that the Lichuan-Enshi area(i.e.,Wells A-HY1 area)is a serious organic matter carbonization zone with high exploration risk.The eastern Shizhu-Wanxian synclinorium(around Well JS1)is a weak organic carbonization zone and relatively higher risk for exploration.The widespread area of the southern Well EY1 and the western Well C7 is an organic non-carbonization zone,hence a potential favorable area for shale gas exploration.

Key words: Shale reservoir characteristics, Organic carbonization, Longmaxi Formation, Western Hubei

中图分类号: 

  • TE122.2

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