渤海湾盆地济阳坳陷林樊家地区馆陶组稠油油源及成藏过程

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中图分类号：TE122.1 文献标志码：A

Abstract：Theoil sourceandaccumulation processofGuantaoFormation heavyoilintheLinfanjiaareaof the Jiyang Depression，Bohai Bay Basin，remain unclear.Inthis study，thesource，genesis，andaccumulationhistoryoftheheavyoil were investigated using biomarkerandcarbon isotopecharacteristicsofcrudeoil，combinedwithfluid inclusionanalysis，through reservoirand molecular geochemistrymethods.Theresults indicate thatthe heavyoil inthe GuantaoFormationoriginated frommature sourcerocksoftheuppersub-memberof thefourth memberof theShahejieFormationintheLijinsag.Biodegradationis identifiedastheprimarymechanismresponsibleforoilthickening，withtheestimated timerequiredtoreach the current level of degradation ranging from 4.4 to 13.0Ma . The formation of the heavy oil involved two charging events and one biodegradationphase.The first wasasmal-scaleoil charge during thedepositionofthePaleogeneDongying Formation （31.2-24.6Ma），folowed byalarge-scaleoil charge during the Neogene Guantao to Minghuazhen Formation（15.0-7.0

Ma）．Oil migrated totheGuantaoFormationreservoirs intheLinfanjiaarea mainlyviathe Shangxifaultandasociatedsand bodies. Approximately2 million yearsafter accumulation（around 13.0Ma ），biodegradationbeganandcontinued，gradually increasingtheoil'sviscosityandformingheavyoil.Theaccumulationprocesscanbesummarizedas：initialcharging，thickening during continued charging，and thensustained biodegradation-driven thickening.These findings providetheoretical insights into the genetic mechanisms，thickening processes，and associated shallowgas occurences of heavyoil inthe Jiyang Depression and other similar settings.

Keywords：heavyoil；oil sourcecorrelation;accumulationperiod；degradationtime;；accumulationprocess；Linfanjiaarea

稠油在渤海湾盆地济阳坳陷占有重要地位，截至2016年底，济阳坳陷探明稠油储量占其总探明石油储量的 56.3%[1] ，尤其是近年来又在三合村、高青等地区取得勘探突破[2]，展现稠油油藏良好的勘探开发前景。（剩余17319字）