Gas potential distribution and controlling factor of coal reservoir in Taiyuan Xishan Coalfield

Zhou Rui; Yao Yanbin; Liu Dameng; Cai Yidong; Wang Yingjin

doi:10.13199/j.cnki.cst.2017.02.020

Abstract：In order to seek the favorable zone target of the coalbed methane development in Xishan Coalfield,taking Malan Mine,Tunlan Mine and Dongqu Mine as the study area,which are siting in the northwest of Xishan Coalfield.Grey Correlation Analysis and other mathematical statistics method were applied to study gas content distribution law and other geological main controlling factors of coal reservoir in Taiyuan Xishan Coalfield.The results showed that on the plane,the study area could be divided to two different local structure subareas,including a syncline control subarea and a fault control subarea.The seams in the middle of the study area had high gas content.Longitudinally,No.8 seam in the study area would have the highest gas content,then No.9 seam and No.2 seam would have high gas contents.In the study area,except to gas content in south-west part controlled by air oxidation role and gas content controlled factors in other areas would be in an important arrangement in order,such as local structure,seam depth,roof thickness and coal petrologic features.In the middle of the study area,there was a strata gentle subarea and local faults were developed as jammed faults and seams depth was deep.Thus the study area could have excellent coalbed methane preservation conditions and the coalbed methane content was high and would be favorable to coalbed methane development.