天然气地球科学

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渝东南地区页岩有机孔隙类型及特征

蔡潇,王亮,靳雅夕,高玉巧,曹海虹,丁安徐   

  1. (中国石化华东分公司石油勘探开发研究院,江苏 扬州 225007)
  • 收稿日期:2015-08-13 修回日期:2016-01-26 出版日期:2016-03-10 发布日期:2016-03-10
  • 作者简介:蔡潇(1988-),男,湖北汉川人,助理工程师,主要从事页岩气实验研究. E-mail:caixiao2370@sina.com.
  • 基金资助:

    中国石化科技项目“川东南地区页岩气高产富集条件与有利区预测”(编号:P14075)资助.

Types and characteristics of organic pore in shalegas reservoir of southeastern Chongqing area

Cai Xiao,Wang Liang,Jin Ya-xi,Gao Yu-qiao,Cao Hai-hong,Ding An-xu   

  1. (Research Institute of Petroleum Exploration and Development,East China Company,SINOPEC,Yangzhou 225007,China)
  • Received:2015-08-13 Revised:2016-01-26 Online:2016-03-10 Published:2016-03-10

摘要:

运用氩离子抛光、场发射扫描电镜和原子力显微镜,对渝东南地区五峰组—龙马溪组页岩有机孔隙结构特征进行研究,在页岩有机质原子力显微成像中发现了特殊的纤网状骨架结构。在此基础上,以页岩有机孔隙母质类型、大小及连通性3个方面为主要依据,将页岩有机孔隙分为沥青单孔、无定形干酪根单孔、结构型干酪根连孔和有机/矿物复合孔4个亚类。其中,沥青单孔是页岩中发育程度最低的孔隙,主要发育为独立的单孔,多为宏孔;无定形干酪根单孔则成片出现,但多为孔径较小的微孔或中孔,且连通性一般;结构型干酪根连孔主要为中孔、宏孔,连通性较好,且有机质内部发育纤网状骨架结构,孔隙在骨架之间的空隙中发育;有机/矿物复合孔主要以有机/黏土复合孔或有机/黄铁矿复合孔的形式存在,主要发育连通性好的中孔、宏孔。结果表明,页岩有机质生烃潜能的差异是决定其孔隙发育程度不同的主要原因,黏土矿物、黄铁矿等无机矿物在有机质生烃过程中扮演着重要角色,对孔隙发育有着积极的影响。

关键词: 渝东南地区, 页岩, 有机孔隙, 五峰组, 龙马溪组

Abstract:

The organic pore’s structure characteristics of Wufeng-Longmaxi Formations shale in the southern Chongqing area were investigated by using argon ion polishing,field emission scanning electron microscopy and atomic force microscopy.A special skeleton structure of fiber network was firstly found in atomic force microscopy imaging of shale organic matter.According to parent material type,size and connectivity,shale organic pores are divided into four sub-categories,including asphaltine pore,amorphous kerogen pore,structured kerogen pore and organic matter/mineral composite pore.Asphaltine pore has the lowest degree of development in shale organic pores,mainly developed as a separate macropore.Amorphous kerogen pores are developed as micropores or mesopores,which are numerous and have poor connectivity.Structured kerogen pore developed a special skeleton structure of fiber network.Many mesopores and macropores with good connectivity are developed in the interspace of skeleton.The main pore types in organic matter/mineral complex are organic matter/clay composite pores and organic matter/pyrite composite pores,which are mainly developed as mesopores and macropores with good connectivity.The differences of hydrocarbon potential in shale organic matter are main reason for pores’ degree of development.The minerals,such as clay or pyrite,played an important role in organic matter’s hydrocarbon generation process and had a positive impact on the pore development.

Key words: Southeastern Chongqing area, Shale;Organic pore, Wufeng Formation, Longmaxi Formation

中图分类号: 

  • TE122.2+3

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