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Ahead of Print Abstract
DOI:10.1306/03212423016
Petroleum migration and accumulation in shale oil system of the Upper Cretaceous Qingshankou Formation in the Songliao Basin, northeastern China
Wenming Ji12 , Fang Hao12 , Fanhao Gong3 , Jian Zhang3 , Yunfeng Bai4 , Chao Liang12 , and Jinqiang Tian12
1 National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
2 School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
3 Shenyang Center of China Geological Survey, Shenyang 110034, China
4 Exploration and Development Research Institute of Daqing Oilfield Co Ltd, Daqing 163712, China
Ahead of Print Abstract
Petroleum migration and accumulation associated with ostracod-bearing layers in shale oil system were investigated using a large suite of high-resolution geochemical and mineralogical data combined with petrology description and pore characterization of shale core samples from the first member of the Upper Cretaceous Qingshankou Formation (K2qn1) in Qijia-Gulong sag of the Songliao Basin, northeastern China. The first member of the Qingshankou shale, deposited in a moderately deep lake setting, is mainly dominated by massive mudrock and laminated shale with numerous ostracod-enriched interbedded layers. The thin carbonate-rich ostracod-bearing layers dominate the total organic carbon (TOC) -lean facies having TOC values less than 2 wt.%. Petroleum yields (S1) and solvent extract yields share similar vertical variation trends with TOC content, indicating TOC content exert an important control on retained hydrocarbon. However, there exist some upward increasing trends of TOC normalized petroleum yields (S1) and solvent extract yields around the organic-lean interbedded carbonate-rich layers dominated by ostracod. This phenomenon combined with bitumen and fluorescing oil within fractures and ostracod associated pores, abnormal Rock-Eval pyrolysis parameters, compositional differences and molecular size differences indicate the presence of migrated hydrocarbon in organic-lean interbedded ostracod-bearing layers. The oil production of ostracod related organic-lean shale reservoir is much more effective due to high brittleness of organic-lean lithofacies, improved oil quality and low content of adsorbed oil. Three stages were proposed in a conceptual model for petroleum migration and accumulation associated with ostracod-bearing layers in the Qingshankou shale-oil system.
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