Gas Generation Evolution and Potential Analysis of Carboniferous-Permian Coal-Measured Source Rocks in Dongpu Depression
Hu Hongjin
Jiang Youlu
Liu Jingdong
Mu Xiaoshui
Zhao Kai
Abstract：The space-time difference of hydrocarbon generation and evolution of Carboniferous-Permian coal-measured source rocks in Dongpu depression has always been a dispute.In addition,the quantitative study of hydrocarbon generation history of source rocks remains to be further studied.In this study,the thermal evolution history of source rock was quantitatively evaluated by thermal simulation and basin simulation.It shows that similar gas generation model could be applied to coal-measured mudstone,coal and carbonaceous mudstone with Ro value of 0.5％,1.2％,2.2％,and 3.15％.Gas generation phase of source rocks could be divided into five stages.The Carboniferous-Permian source rocks in study area have experienced mature evolution periodically and the whole process of hydrocarbon generation occurring to the source rocks could be divided into three periods,which are the Hercynian-Indosinian epoch,the Early Himalayan epoch and the Late Himalaya epoch.However,the main gas generation periods are distributed from Late Paleogene Shahejie to Dongying period and Neogene Minghuazhen period to the present and thermal evolution of the source rock also entered into the mature-overmature stage meanwhile.The cumulative gas generation intensity was strongest in the Early Himalaya epoch,followed by the Late Himalayan epoch and the HercynianIndosinian epoch and the amount of gas generation during the three periods was 9.28％,62.07％,28.64％ respectively.The main hydrocarbon generation areas are concentrated in the sag zone and in the middle of the central uplift zone,and the gas generation contribution of coal is the largest,accounting for 68％ of the total.
Keywords：thermal evolution historyhydrocarbon generation historypotential analysisCarboniferous-Permiancoal-measured source rockDongpu depressionnatural gas geology
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 610-621 )