中国石油大学学报（自然科学版）2025，Vol.49Issue(6)：55-64,10.DOI:10.3969/j.issn.1673-5005.2025.06.005
东海盆地平湖组煤系泥岩生排烃特征
Characteristics of hydrocarbon generation and expulsion in coal measure mudstone of Pinghu Formation in Donghai Basin
摘要
Abstract
Comparative studies on the hydrocarbon generation and expulsion characteristics of different lithologies within coal-bearing source rocks remain limited.In this study,a series of gold-tube simulations under controlled temperature and pres-sure conditions were conducted on dark mudstone and carbonaceous mudstone samples from the Pinghu Formation in the East China Sea Basin.The evolution of hydrocarbon products and expulsion efficiencies across various maturity stages for these two lithologies was systematically analyzed.The results indicate that both dark mudstone and carbonaceous mudstone exhibit characteristics of oil-gas co-generation,with oil generation occurring at early stages and continued gas generation at later sta-ges.Dark mudstone displays lower maximum oil generation,oil expulsion,and expulsion efficiency than carbonaceous mud-stone.As thermal maturity increases,liquid hydrocarbon production declines while gaseous hydrocarbon production increases when easy Ro>1.07%.The total hydrocarbon yield of dark mudstone continues to rise,whereas that of carbonaceous mud-stone tends to stabilize.Notably,dark mudstone reaches its peak oil expulsion efficiency at easy Ro=0.69%,while that of carbonaceous mudstone begins to decline at easy Ro=1.07%.Pressure exerts minimal influence on hydrocarbon generation when easy Ro ranges from 0.51%to 1.33%.However,when easy Ro>2.06%,pressure inhibits both liquid and gaseous hy-drocarbon generation,with the inhibitory effect becoming more pronounced as pressure increases.Pressure also affects oil ex-pulsion efficiency:moderate pressures(around 60 MPa)mainly suppress oil expulsion during the overmature stage,whereas higher pressures(>120 MPa)significantly reduce oil expulsion even during the main oil-generation stage.关键词
煤系烃源岩/生烃模式/排烃效率/东海盆地/模拟试验Key words
coal-measure source rock/hydrocarbon generation model/expulsion efficiency/Donghai Basin/simulation ex-periment分类
能源科技引用本文复制引用
何大祥,吴珈仪,段野,潘志强,李博偲,颜凯,唐友军..东海盆地平湖组煤系泥岩生排烃特征[J].中国石油大学学报（自然科学版）,2025,49(6):55-64,10.基金项目
国家自然科学基金项目(41972148) （41972148）
中国海洋石油集团公司科研条件平台建设项目(CNOOC-KJPTGCJS2020-01) （CNOOC-KJPTGCJS2020-01）
