Organic matter sources and depositional environment analysis of continental shale oil:a case study of Paleogene sec-ond member in Funing Formation in the Huazhuang Area,Gaoyou Sag,Subei Basin
Organic matter sources and depositional environment analysis of continental shale oil:a case study of Paleogene sec-ond member in Funing Formation in the Huazhuang Area,Gaoyou Sag,Subei Basin
The Gaoyou Sag in the Subei Basin is rich in oil and gas resources,with high potential for ex-ploration and development.This study focuses on typical shale samples from the second member of the Funing Formation(E1f2)in the Huazhuang Area of the Gaoyou Sag.Gas chromatography-mass spec-trometry(GC-MS)was used to analyze biomarkers,X-ray diffraction(XRD)was employed for quantita-tive analysis of clay minerals,and inductively coupled plasma mass spectrometry(ICP-MS)was applied for trace element analysis to determine the organic matter sources and depositional environment.The re-sults indicate that the organic matter in the study area primarily originated from lower aquatic organisms and was deposited in a reducing environment.During the early deposition of E1f2,the climate was pre-dominantly cold and arid with low precipitation,transitioning to a warm and humid climate with increas-ing rainfall in the later stage.The early depositional environment was characterized by saline water,while salinity gradually decreased in the later stage.The formation of lakes under humid conditions was a prerequisite for oil shale deposition,while an anoxic reducing environment and saline depositional con-ditions were critical for organic matter enrichment.These findings provide valuable guidance for shale oil exploration in the Huazhuang Area of the Gaoyou Sag in the Subei Basin.
关键词
页岩油/有机质来源/古环境/陆相/阜宁组二段/古近系/花庄地区/高邮凹陷/苏北盆地
Key words
shale oil/organic matter source/paleoenvironment/continental facies/second member of Funing Formation/Paleogene/Huazhuang Area/Gaoyou Sag/Subei Basin
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