Geological Features Of Coalbed Methane Enrichment Of Kele Syncline And Favorable Areas Prediction In Guizhou Province

The Kele syncline is the main coal-bearing syncline in Guizhou Province,which is characterized by a large number of coal seams,high metamorphic degree of coal and rock,high CBM content and so on.This paper takes Jiegou,Caishen and Qingchang blocks of the Kele syncline as the research objects,summarizesvarious factors affecting CBM enrichment from the geological characteristics and coal reservoir physical characteristics by the research of the basic geological survey of Kele syncline.Based on the previous research results and coal mine exploration data,this paper analyzes the coal reservoir thickness,coal and rock characteristics,gas-bearing characteristics,coal seam roof and floor characteristics in detail.On this basis,the characteristics of the high-yield favorable area of coalbed methane in Kelesyncline are summarized,and the optimal evaluation system of favorable area which is suitable for the actual situation of Kelesyncline is established.The coal-bearing strata of Kelesyncline mainly occur in the Permian Changxing formation?P₃c?andLongtan formation?P₃l?in the Caishen block andQingchangblock.Jiegou block mainly contains M16,M18,M23 three mineable coal seams,Caishen block mainly contains M3,M6,M13,M18,M23 five mineable coal seams,Qingchang block mainly contains M16,M18,M23three mineable coal seams.Lump coal is the main coal body in each coal seam,and fragmented coal is present in some areas due to structural influences.The gas content of each coal seam increases gradually from west to east and from shallow to deep.This work divides Class?favorable areas and Class?favorable areas from three blocks respectively.InJiegoublocks,the Class?favorable areas is 18.62 km² and Class?favorable areas is 19.45 km².In Caishenblocks,the Class?favorable areas is 3.49 km² and Class?favorable areas is 37.63 km².In Qingchangblocks,the Class?favorable areas is 4.26 km² and Class?favorable areas is 6.88 km².