西南石油大学学报(自然科学版)

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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

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