Search

Western Guizhou has the most abundant coalbed methane resources in South China. In order to efficiently exploit the coalbed methane in this area, it is important to understand the drainage decompression and orderly development methods of coal seam groups under the control of Unattached multiple superposed CBM-bearing system. This paper took Feitian Block of Zhina coal field in Western Guizhou as the researching area, analyzing the meticulous hydrogeological condition of coal-bearing strata and the difference of development condition of different coal seam groups in vertical. Based on pumping test data from previous coal exploration, useful information was generated, including the apparent reservoir pressure, pressure gradient, unit water inflow, permeability coefficient and radius of influence. The difference of hydrogeological condition in different parts of coal-bearing strata in three-dimensional space was compared. Eventually, the factor of evaluating CBM development priority was established through fuzzy mathematics synthetical judgement. Accordingly, the developing potential and development order of different coal seam groups in vertical of the three coal mine areas was discussed. It is concluded that the Feitian 2 and Feitian 3 mine areas have a better CBM development condition than Feitian 1,among which Feitian 2 medium part, Feitian 3 upper part and medium part are prior for CBM development. Generally, The development order of each part of coal-bearing strata of each coal mine area is : Feitian 3 upper part → Feitian 2 medium part →Feitian 3 medium part →Feitian 3 lower part →Feitian 2 lower part →Feitian 2 upper part →Feitian 1 upper part /Feitian 1 medium part →Feitian 1 lower part. [ABSTRACT FROM AUTHOR]