西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

湘西北牛蹄塘组页岩气形成条件及有利区预测

姜文1,唐书恒2,龚玉红3,范二平2,张成龙2   

  1. 1. 湖南省地质调查院,湖南长沙410116
    2. 中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京海淀100083
    3. 湖南省煤田地质局,湖南长沙410114
  • 出版日期:2014-10-01 发布日期:2014-10-01
  • 通讯作者: 唐书恒,E-mail:tangsh@cugb.edu.cn
  • 基金资助:

    国家自然科学基金(41272176);教育部博士点基金(20110022110007)。

The Reservoir Characteristics and Favorable Areas of Shale Gas
in Northwestern Hunan Lower Cambrian Niutitang

Jiang Wen1, Tang Shuheng2 , Gong Yuhong3, Fan Erping2, Zhang Chenglong2   

  1. 1. Hunan Institute of Geology Survey,Changsha,Hunan 410116,China
    2. MOE Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,China University of Geosciences(Beijing),
    Haidian,Beijing 100083,China;3. Bureau of Coal Geology of Hunan Province,Changsha,Hunan 410114,China
  • Online:2014-10-01 Published:2014-10-01

摘要:

基于野外露头和剖面资料,应用薄片观察、有机岩石学分析、扫描电镜、压汞、比表面和等温吸附实验等分析
测试成果,研究了湘西北地区下寒武统牛蹄塘组形成条件及其有利区分布情况。研究表明:牛蹄塘组黑色页岩具有沉
积面积广、厚度大、有机碳含量高(平均1.87%)和成熟度较高(大于1.0% 以上)等特点。在储层物性方面,页岩孔隙度
变化差异大(0.2%~25.9%),平均孔径12.5±3.0 nm,分选性好,有利于含气页岩储层改造后的运移;孔隙结构以微小孔
为主,比表面积大,吸附甲烷能力较强,具有较好的含气潜力;对比美国五大盆地页岩气选区参数,认为永顺—桑植和
慈利—石门一带为页岩气形成有利区带。

关键词: 湘西北, 牛蹄塘组, 页岩气, 孔隙特征, 有利勘探区

Abstract:

Through outcrop observation and cross section measured,together with analytic results like microscope observation,
geochemical parameters,pore structure,surface area and methane adsorption isotherm experiments,the geological
accumulation characteristics and physical properties of the shale gas were investigated in detail in this article. Results show
that the shale is characterized with wide distribution area,a great thickness,high organic content(an average of 1.87%),and
high organic thermal evolution degree(above 1.0%). At the same time,a large variation in porosity(0.2%~25.9%),with an
average size of 12.5±3.0 nm,and good sorting is conducive to shale reservoir reconstruction after migration. Pore structure is
mainly dominated by tiny pores,but due to larger specific surface area and strong methane adsorption ability,a large amount
of methane adsorbed on the shale surface. According to contrast with the shale constituency parameters of American 5 basins,
we suggest that Yongshun–Sangzhi and Cili–Shimen Area are favorable shale gas accumulation zones.

Key words: northwestern Hunan, Niutitang Formation, shale gas, pore structure, favorable exploration area