Geology and potential of coalbed methane resources from Guizhou, China

摘要

Based on the analysis, it was shown that there are remarkable characteristics of the "one poor, two more, three higher and four bigger" in coalbed methane (CBM) conditions of Guizhou, China, that is to say, poor water yield property of the Later Permian coal-bearing formation, and more CBMcontrolling structure types and coal seams, and higher CBM content, abundance, reservoir pressure and geo-stress, and bigger CBM resources, coal-rank and reservoir permeability variation and vertical variation of geological conditions. These show in one aspect the predominance with higher CBM resource accumulation, coal reservoir energy and developing potential in Guizhou, and in another aspect come into being disadvantageous of coal reservoir permeability and recasting. So, new thought and technologies must be sought ask for CBM development in Guizhou. The authors in the paper considered that it is essential to survey clearly CBM resources in whole province, to analyze the adaptability of varous CBM-mining technologies to CBM geological conditions in Guizhou, and, then, to frame rationally the stratagem and layout of CBM exploration and development aiming at the particularity of CBM geology in the province. In was suggested that near CBM exploration and surface development should be focalized to Zhijin-Nayong coal field and a CBM pilot test with vertical or cluster wells may be carried into execution using for reference the Jincheng's pattern. As for the Liupanshui and other coal fields, the Huainan's pattern can be used for reference. That is to say, CBM is mined form the coal-mining-disturbed areas with a large scale of crustal stress unloading comprehensively using coal-mining-before,-on line and-after draining technologies and, at one time, distributed and pint-sized CBM utilizing, storing and carrying equipments are matched.