Gas content evaluation in deep coal seam with an improved method and its geological controls  

作　　者：Haiqi LI Shida CHEN Dazhen TANG Shuling TANG Jiaosheng YANG 

机构地区：[1]School of Energy Resource,China University of Geosciences(Beijing),Beijing 100083,China [2]Coal Reservoir Laboratory of National Engineering Research Center of Coalbed Methane Development and Utilization,Beijing 100083,China [3]Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering,Beijing 100083,China [4]China Petroleum Exploration and Development Research Institute,Langfang 065000,China

出　　处：《Frontiers of Earth Science》2024年第3期623-636,共14页地球科学前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.42130802);PetroChina Company Limited“14th Five Year Plan”Science and Technology Major Project(No.2021DJ2301).

摘　　要：An improved evaluation method for estimating gas content during the inversion process of deep-burial coal was established based on the on-site natural desorption curves.The accuracy of the US Bureau of Mines(USBM),Polynomial fitting,Amoco,and the improved evaluation methods in the predicting of lost gas volume in deep seams in the Mabidong Block of the Qinshui Basin were then compared.Furthermore,the calculation errors of these different methods in simulating lost gas content based on coring time were compared.A newly established nonlinear equation was developed to estimate the minimum error value,by controlling the lost time within 16 min,the related errors can be reduced.The improved evaluation was shown to accurately and rapidly predict the gas content in deep seams.The results show that the deep coal bed methane accumulation is influenced by various factors,including geological structure,hydrodynamic conditions,roof lithology,and coalification.Reverse faults and weak groundwater runoff can hinder the escape of methane,and these factors should be considered in the future exploration and development of coalbed methane.

关 键 词：deep coalbed methane Mabidong Block lost gas geological controls 

分 类 号：TD82[矿业工程—煤矿开采]