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| Characteristics and origin analysis of viscous oil and reservoir bitumen in Santai Beisantai area |
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LU Jun gang1,2, CHEN Shi jia1,2, WANG Xu long3, WANG Yi1, ZHANG Ji zhi1, SHI Zheng hao1
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(1.College of Resource and Environment, Southwest Petroleum University, Chengdu 610500, China;2.Reservoir Geology and Development Project National Key Laboratory, Southwest Petroleum University, Chengdu 610500, China;3.Xinjiang Oilfield Company, Karamay 834000, China)
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| Abstract: |
| According to the geochemical characteristics of crude oil, reservoir bitumen and source rocks, the origin of viscous oil and reservoir bitumen was analyzed. The effects of bitumen and viscous oil on the exploration were researched. The results show that the viscous oil distributes widely in Jurassic and Triassic formation, and the reservoir bitumen distributes mainly in the Toutunhe formation and above the formation. Both viscous oil and reservoir bitumen are suffered from strong biodegradation, and most hydrocarbon components and n alkanes in oil are loss. The oil and bitumen in the region come mainly from Pingdiquan group source rocks of Permian. The heavy viscous oil and reservior bitumen all derived from the result that the low maturity crude oil suffered from loss and strong biodegradation. The medium density oil comes from the result that the mature oil suffered from loss and moderate biodegradation. The oil and gas at peak stage is not destroyed seriously, and the later target of exploration should be middle fine sandstone belt and the downdip part of the Santai Beisantai uplift. |
| Key words: biodegradation reservoir bitumen origin of viscous oil Santai Beisantai Junggar Basin |
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