Challenges and development direction of deep fragmented soft coalbed methane in China  

作　　者：Yiyu Lu Guilin Zhao Zhaolong Ge Yunzhong Jia Jiren Tang Tianyi Gong Shan Huang Zhongtan Li Wenyu Fu Jianyu Mi 

机构地区：[1]State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China [2]School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China

出　　处：《Earth Energy Science》2025年第1期38-64,共27页地球能源科学(英文)

基　　金：supported by the National Natural Science Foundation of China(52074045,52274074);the Science Fund for Distinguished Young Scholars of Chongqing(CSTB2022NSCQ-JQX0028).

摘　　要：Developing deep fragmented soft coalbed methane(CBM)can significantly enhance domestic natural gas supplies,reduce reliance on imported energy,and bolster national energy security.This manuscript provides a comprehensive review of commonly employed coalbed methane extraction technologies.It then delves into several critical issues in the current stage of CBM exploration and development in China,including the compatibility of existing technologies with CBM reservoirs,the characteristics and occurrence states of CBM reservoirs,critical desorption pressure,and gas generation mechanisms.Our research indicates that current CBM exploration and development technologies in China have reached an internationally advanced level,yet the industry is facing unprecedented challenges.Despite progress in low-permeability,high-value coal seams,significant breakthroughs have not been achieved in exploring other types of coal seams.For different coal reservoirs,integrated extraction technologies have been developed,such as surface pre-depressurisation and segmented hydraulic fracturing of coal seam roof strata.Additionally,techniques like large-scale volume fracturing in horizontal wells have been established,significantly enhancing reservoir stimulation effects and coalbed methane recovery rates.However,all of these technologies are fundamentally based on permeation.These technologies lack direct methods aimed at enhancing the diffusion rate of CBM,thereby failing to fully reflect the unique characteristics of CBM.Current CBM exploration and development theories and technologies are not universally applicable to all coal seams.They do not adequately account for the predominantly adsorbed state of CBM,and the complex and variable gas generation mechanisms further constrain CBM development in China.Finally,continuous exploration of new deep CBM exploration technologies is necessary.Integrating more effective reservoir stimulation technologies is essential to enhance technical adaptability concerning CBM reservoir characteristics,gas

关 键 词：Deep coalbed methane Exploration and development technology Reservoir characteristics Critical desorption pressure Gas production mechanism Development direction 

分 类 号：P61[天文地球—矿床学]