CRETACEOUS HYDROCARBON FORMATION AND MIGRATION DIRECTION IN WELL SHINAN 31 IN THE HINDLAND OF JUNGGAR BASIN
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摘要: 石南31井位于准噶尔盆地腹部陆西地区石西油田之北,是继石南21井侏罗系头屯河组油藏之后的又一重大发现。储层层位为白垩系清水河组,油气藏气油比高,油质轻,但与生物降解的黑油伴生。文章采用全烃地球化学方法确定油气来源,指出石南31井白垩系储层油气来自盆1井西凹陷二叠系乌尔禾组源岩。阐明了石南31井白垩系与南面石西油田石炭系和侏罗系的油气成因关系,建立了石南31井白垩系的油气运移成藏模式,指出石西与石南31井过渡区可捕获由南向北运移的油气,是近期主要的勘探目标。Abstract: Well Shinan 31 locates in the north of the Shixi Oilfield,the hindland of Junggar Basin.It's another major discovery after finding the Jurassic Toutunhe Formation reservoir in the Well Shinan 21.The reservoir is in the Cretaceous Qingshuihe Formation with high gas and oil ratio and light oil,while associating with the black biological degradation oil.The article applies entire hydrocarbon geochemical methods to confirm the origin of the oil-gas.It pointed out that the oil and gas was from the Wuerhe Formation source rock in the western Well Pen 1 Sag.It also clarified the oil and gas genetic relationship between Cretaceous oil and gas in Well Shinan 31 and Carboniferous and Jurassic oil and gas in Shixi Oilfield.It established the hydrocarbon formation mode of the Cretaceous reservoir in Well Shinan 31 and pointed out that the chief exploration target in the near future is the oil and gas captured by the transition region between the Shixi Oilfield and Well Shinan 31 during its migrating from south to north.
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Key words:
- hydrocarbon formation /
- accumulation mode /
- Cretaceous /
- Well Shinan 31 /
- Luxi area /
- Junggar Basin
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