中国石油大学学报（自然科学版）2025，Vol.49Issue(4)：38-49,12.DOI:10.3969/j.issn.1673-5005.2025.04.004
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
Oil source and accumulation process of Guantao Formation heavy oil in Linfanjia area,Jiyang Depression,Bohai Bay Basin
摘要
Abstract
The oil source and accumulation process of Guantao Formation heavy oil in the Linfanjia area of the Jiyang Depres-sion,Bohai Bay Basin,remain unclear.In this study,the source,genesis,and accumulation history of the heavy oil were investigated using biomarker and carbon isotope characteristics of crude oil,combined with fluid inclusion analysis,through reservoir and molecular geochemistry methods.The results indicate that the heavy oil in the Guantao Formation originated from mature source rocks of the upper sub-member of the fourth member of the Shahejie Formation in the Lijin sag.Biodegra-dation is identified as the primary mechanism responsible for oil thickening,with the estimated time required to reach the current level of degradation ranging from 4.4 to 13.0 Ma.The formation of the heavy oil involved two charging events and one biodegradation phase.The first was a small-scale oil charge during the deposition of the Paleogene Dongying Formation(31.2-24.6 Ma),followed by a large-scale oil charge during the Neogene Guantao to Minghuazhen Formation(15.0-7.0 Ma).Oil migrated to the Guantao Formation reservoirs in the Linfanjia area mainly via the Shangxi fault and associated sand bodies.Approximately 2 million years after accumulation(around 13.0 Ma),biodegradation began and continued,gradually increasing the oil̍s viscosity and forming heavy oil.The accumulation process can be summarized as:initial charging,thick-ening during continued charging,and then sustained biodegradation-driven thickening.These findings provide theoretical in-sights into the genetic mechanisms,thickening processes,and associated shallow gas occurrences of heavy oil in the Jiyang Depression and other similar settings.关键词
稠油/油源对比/成藏期次/降解时间/成藏过程/林樊家地区Key words
heavy oil/oil source correlation/accumulation period/degradation time/accumulation process/Linfanjia area分类
能源科技引用本文复制引用
高长海,覃善卿,张云银,查明,王兴谋,曲江秀,李豫源,张伟忠..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[J].中国石油大学学报（自然科学版）,2025,49(4):38-49,12.基金项目
山东省自然科学基金项目(ZR2021MD077) （ZR2021MD077）
国家自然科学基金项目(42272153) （42272153）
