Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (4): 17-24.doi: 10.3969/j.issn.1673-8926.2015.04.003

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Reservoir characteristics of shale gas of Upper Permian Dalong Formation in Lianyuan-Shaoyang depression, central Hunan

Xiao Zhenghui1，2， Niu Xianqiang1， Yang Rongfeng1， Yu Ye1， Huang Yanran1， Chen Xinyue1   

  1. 1. Hunan Provincial Key Laboratory of Shale Gas Resource Utilization ， Hunan University of Science and Technology ，Xiangtan 411201 ， Hunan ， China ； 2. Hunan Provincial Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection ， Hunan University of Science and Technology ， Xiangtan 411201 ， Hunan ， China ）
  • Online:2015-07-20 Published:2015-07-20

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Abstract:

To evaluate shale gas exploration potential in Upper Permian Dalong Formation in Lianyuan-Shaoyang depression, central Hunan, the reservoir characteristics of shale gas were investigated by the analysis of total organic carbon （TOC） content, mineral composition, microscopic characteristics of pores and fractures, porosity and permeability of shale. The results show that the TOC content has close relationship with lithology, the TOC content of siliceous mudstones were the highest, with an average value over 3%, which shows that it is obviously controlled by sedimentary environment. The brittle mineral contents in the siliceous mudstones were 67.7% on average, which is essentially the same as the brittle mineral contents in Barnett siliceous shale of America. The tectonic fractures developed well, and they are related to the brittle mineral contents and geological structure. The organic micropore is the main composition of pore-fracture system in the siliceous mudstones with higher TOC content. The porosity and permeability of siliceous mudstones were both low, being lower than 5% and 0.01 mD respectively. Fracture development degree is the dominant factor for influencing porosity and permeability of siliceous mudstones.

Key words: shale gas, petrophysical model, adsorbed gas, free gas, Shunan area, Sichuan Basin

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