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Characteristics,Types,and Prospects of Geological Sweet Sections in Giant Continental shale oil Provinces in China

Journal of Earth Science 2022年第5期33卷 1260-1277页

作者： Zhi Yang Caineng Zou Songtao Wu Songqi Pan Xiaoni Wang Haitao Liu Wenqi Jiang Jiarui Li Qiyan Li Xiaobing Niu Guohui Li Zhenxing Tang Xuguang Guo Dong Huang Qizhao Wei Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China School of Earth and Space Sciences Peking UniversityBeijing100871 School of Energy China University of GeosciencesBeijing 100083China Research Institute of Exploration and Development PetroChina Changqing Oilfield CompanyXi'an 710021China Research Institute of Exploration and Development PetroChina Daqing Oilfield CompanyDaqing 163712China Research Institute of Exploration and Development PetroChina Jilin Oilfield CompanySongyuan 138000China Research Institute of Exploration and Development PetroChina Xinjiang Oilfield CompanyKelamay 834000China Research Institute of Exploration and Development PetroChina Southwest Oil&Gasfield CompanyChengdu 610051China

“Sweet sections”in giant shale oil provinces are preferential fields that primarily support China to increase the reserves and production of continental shale oil.Based on the study of the geological conditions of shale oil in the continental basins in China,it was found that the shale stratum in major oil generation windows generally has higher degrees of oil and gas accumulation,and mostly contains oil.Hydrocarbon generation and reservoir capacities are the two key parameters for evaluating and optimizing favorable shale oil provinces.The evaluation index(volume of shale stratum multiplied by total organic carbon(TOC)multiplied by total porosity)for the giant continental shale oil provinces is also proposed.It is optimized that the Upper Triassic Chang 7 Member in the southcentral Ordos Basin,Lower Cretaceous Qing 1 Member in the Gulong-Changling Sag in the Songliao Basin,Middle-Lower Permian in the Junggar Basin,Da’anzhai Member of the Ziliujing Formation of Lower Jurassic in the central and northern Sichuan Basin,and Paleogene oil-rich sag in the Bohai Bay Basin are the five giant continental shale oil provinces.The word“geological sweet sections”in continental shale oil provinces of China refers to favorable shale intervals which are relatively rich in oil,with superior physical properties,and more easily modified and developed commercially under applicable economic and technological conditions.After evaluation,there are mainly two types of“geological sweet sections”of giant continental shale oil developed onshore in China.One type of“geological sweet sections”is generally mudstone with optimal physical properties or a thin tight reservoir,to which the shale oil migrates a short distance.They are medium-to-high-mature zones with a thin sandy shale stratum in the Chang 7 Member in the Ordos Basin,mixed shale stratum in the mediummature Lucaogou Formation in the Jimsar Sag,and multi-layered mixed Paleogene shale stratum in the Bohai Bay Basin.The other type of“geological sweet sections”is generally shale oil r

关键词： continental shale oil shale stratum geological sweet section source rock oil micro-nano pore throats laminae lamination free hydrocarbons shale oil revolution petroleum geology

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