中国非常规天然气主体开发技术新进展与发展方向OA

The annual production of unconventional natural gas in China now accounts for over 40%of the country's total natural gas production,demonstrating remarkable development achievements.This paper systematically reviews recent advances in tight sandstone gas,shale gas,coalbed methane,and deep coalbed methane/coal rock gas,focusing on theoretical and mechanistic understanding,key technological breakthroughs,field pilot demonstrations,and industrial-scale applications.It further analyzes the major problems and challenges currently facing the industry and proposes future development directions for key production technologies.The results indicate that:(1)China's unconventional natural gas industry has gradually established a distinctive essential technology system,which has strongly supported the large-scale and economically efficient development of unconventional gas and is continuously advancing toward more refined and cost-effective developments;(2)the overall development of unconventional natural gas in China has entered a critical stage of transformation from"rapid expansion"to"quality and efficiency improvement",while still facing challenges such as rapid production decline,relatively low recovery factors in matured producing areas,scattered distribution of remaining reserves,and immature essential development technologies for new layers and emerging exploration domains;and(3)future efforts should focus on overcoming technical difficulties in multiple aspects,including intelligent and precise characterization of fracture networks,accurate identification of remaining gas,optimized deployment of three-dimensional well patterns,upgraded reservoir stimulation technologies,and formation energy supplementation.This study suggests that maximizing the recovery factor under the primary well pattern,continuously iterating core development processes,tackling technologies for mobilizing difficult-to-produce reserves,and innovating technologies for substantially enhancing gas recovery can effectively support stable and increased unconventional natural gas production,thereby making greater contributions to national energy security.