东海盆地平湖组煤系泥岩生排烃特征

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中图分类号：TE13 文献标志码：A

Abstract：Comparativestudiesonthehydrocarbongenerationand expulsioncharacteristicsofdiferentlithologies withincoalbearing sourcerocksremain limited.Inthis study，aseriesof gold-tubesimulations undercontrolld temperatureand pressureconditions wereconductedondark mudstoneandcarbonaceous mudstonesamples fromthe Pinghu Formationin the East China Sea Basin.Theevolutionof hydrocarbonproductsandexpulsion eficienciesacross various maturity stages forthese two lithologies wassystematicallyanalyzed.Theresults indicate thatbothdarkmudstoneandcarbonaceous mudstoneexhibit characteristicsofoilgasco-generation，withoil generationoccuringatarlystagesandcontinuedgasgenerationatlaterstages.Dark mudstone displays lower maximumoil generation，oil expulsion，and expulsion eficiencythancarbonaceous mudstone.Asthermal maturityincreases，liquid hydrocarbonproductiondeclines whilegaseous hydrocarbonproductionicreases when easy Ro>1.07% .The total hydrocarbon yield of dark mudstone continues to rise，whereas that of carbonaceous mudstone 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 hydrocarbongeneration，withtheinhibitory efectbecoming more pronouncedaspressure increases.Pressurealsoafectsoil expulsion efficiency ：moderate pressures （around 60 MP a ） mainly suppress oil expulsion during the overmature stage，whereas higher pressures （ > 120 MP a ） significantly reduce oil expulsion even during the main oil-generation stage.

Keywords：coal-measure source rock；hydrocarbon generation model；expulsion eficiency；Donghai Basin；simulation experiment

烃源岩的生烃能力与排烃（初次运移）效率是常规油气资源潜力评价的关键参数，也是预测含油气盆地油气资源评价工作中的重要环节，其受到烃源岩自身有机质丰度、类型、成熟度与热历史等多种因素影响[-3]。（剩余18499字）