Coal-rock gas accumulation mechanism and the whole petroleum system of coal measures  

作　　者：LI Guoxin JIA Chengzao ZHAO Qun ZHOU Tianqi GAO Jinliang 

机构地区：[1]China National Petroleum Corporation,Beijing 100007,China [2]PetroChina Company Limited,Beijing 100007,China [3]PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China [4]PetroChina Oil,Gas and New Energy Company,Beijing 100007,China [5]CNPC Key Laboratory of Coal-rock Gas,Langfang 065007,China

出　　处：《Petroleum Exploration and Development》2025年第1期33-49,共17页石油勘探与开发(英文版)

基　　金：Supported by the PetroChina Basic Project(2024DJ23);CNPC Science Research and Technology Development Project(2021DJ0101)。

摘　　要：Coal measures are significant hydrocarbon source rocks and reservoirs in petroliferous basins.Many large gas fields and coalbed methane fields globally are originated from coal-measure source rocks or accumulated in coal rocks.Inspired by the discovery of shale oil and gas,and guided by“the overall exploration concept of considering coal rock as reservoir”,breakthroughs in the exploration and development of coal-rock gas have been achieved in deep coal seams with favorable preservation conditions,thereby opening up a new development frontier for the unconventional gas in coal-rock reservoirs.Based on the data from exploration and development practices,a systematic study on the accumulation mechanism of coal-rock gas has been conducted.The mechanisms of“three fields”controlling coal-rock gas accumulation are revealed.It is confirmed that the coal-rock gas is different from CBM in accumulation process.The whole petroleum systems in the Carboniferous–Permian transitional facies coal measures of the eastern margin of the Ordos Basin and in the Jurassic continental facies coal measures of the Junggar Basin are characterized,and the key research directions for further developing the whole petroleum system theory of coal measures are proposed.Coal rocks,compared to shale,possess intense hydrocarbon generation potential,strong adsorption capacity,dual-medium reservoir properties,and partial or weak oil and gas self-sealing capacity.Additionally,unlike other unconventional gas such as shale gas and tight gas,coal-rock gas exhibits more complex accumulation characteristics,and its accumulation requires a certain coal-rock play form lithological and structural traps.Coal-rock gas also has the characteristics of conventional fractured gas reservoirs.Compared with the basic theory and model of the whole petroleum system established based on detrital rock formations,coal measures have distinct characteristics and differences in coal-rock reservoirs and source-reservoir coupling.The whole petroleum system of coal meas

关 键 词：coal measure coal-rock gas coalbed methane tight gas coal-rock play accumulation mechanism whole petroleum system whole petroleum system of coal measures 

分 类 号：TD3[矿业工程—矿井建设]