Characteristics of CBM Reservoirs and Their Resource Potential in the Southern Sichuan Basin

doi:10.11885/j.issn.1674-5086.2015.10.06.15

Abstract

Abstract: According to the results of several coalbed methane(CBM) resource evaluations, the coal in the southern Sichuan Basin is mainly anthracite, similar to that of the Qinshui Basin. The coal bed in the southern Sichuan Basin contains a large amount of CBM resources due to the high degree of coal metamorphism, strong adsorption capacity, and large gas content. The CBM reservoir characteristics in the southern Sichuan Basin, such as the coal layer distribution, coal rock quality, pore-fracture features, gas content, and isothermal adsorption features of the coal beds, were analyzed and the coal reservoir quality and CBM resource potential were evaluated in this study using logging and CBM parameter well data. The results show that the regional coal development is unstable because of an overall great burial depth and high degree of coal metamorphism. The coal reservoirs have a large Langmuir volume, high gas content, good gas quality, high gas saturation, small Langmuir pressure, and small critical desorption pressure. The comprehensive evaluation shows that the CBM reservoir has a good quality and great potential; however, its development is relatively difficult. Therefore, suitable mining technology is needed. We selected the Changning-Xuyong block as the experiment area for CBM exploration and development to determine CBM evaluation methods and effective mining technologies.

Key words: reservoir characteristics, exploration potential, Longtan Formation, coalbed methane gas, Southern Sichuan Basin

CLC Number:

TE122

JIANG Yuqiang, LUO Mingsheng, ZHANG Hu, WANG Yong, GAN Hui. Characteristics of CBM Reservoirs and Their Resource Potential in the Southern Sichuan Basin[J]. 西南石油大学学报(自然科学版), 2017, 39(1): 43-52.

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