Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (4): 11-16.doi: 10.3969/j.issn.1673-8926.2015.04.002

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Influencing factors of shale gas-bearing property of Lower Cambrian Niutitang Formation in northwestern Hunan

Huang Yanran， Yang Rongfen， Xiao Zhenghui， Yu Ye， Yang Xian   

  1. Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology ， Xiangtan 411201 ， Hunan ， China
  • Online:2015-07-20 Published:2015-07-20

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Abstract:

The Lower Cambrian Niutitang Formation in northwestern Hunan developed a set of organic-rich shale which is characterized by stable distribution and large size, with great burial depth and relatively complete conservation in synclinorium of Sangzhi-Shimen area. The gas content of the enriched shale gas area of Niutitang Formation is between 1.48 m3/t and 8.75 m3/t, so these areas have a good potential of industrial development. Organic carbon content determines the resources potential of shale gas, and meanwhile affects the adsorption and storing capacity. There are five genetic types reservoir space, including primary intercrystalline or intergranular micropores, organic material micropores, dissolved micropores of unstable mineral, structural fractures and cleavage fissures. The adsorption and resolution of shale gas is easy to happen. The storage state of shale gas is under the combined influence of organic material content and the type of reservoir space. The natural gas generated by high and over-matured organic-rich shale can accumulate and form reservoir under good preservation conditions. Temperature, pressure, burial depth and mineral composition have little effects on the gas-bearing property of Niutitang Formation.

Key words: microseismic monitoring, research advances, hydraulic fracturing, comprehensive interpretation

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