Petroleum -entrapped System AndAccumulation in the Wenjisang- Qiudong Area, Tuha Basin
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摘要: 本文从构造作用、热演化及流体压力孕育与油气运聚等成藏动力作用，探讨了温吉桑—丘东地区的成藏演化，并将其划分为两个油气成藏体系。第一成藏体系从早中侏罗世到老第三纪，尤以侏罗纪末至早白垩世为成藏活跃期；第二成藏体系从新第三纪到第四纪，其中上新世末至今为成藏活跃期。油气聚集以第一成藏体系为主。根据流体动力势场分析了该区油气成藏体系与聚集的关系，提出了油气成藏模式，指出温西、温吉桑油田主要形成于以油为主的第一成藏体系，米登油田为一个油、气并重的油气藏，丘东气田主要形成于第二成藏体系.Abstract: Based on such dynamic geologic functions as structure, thermal history, fluid potential developmentand the migration and accumulation of oil＆ gas, the pool-formed evolutional history was discussed andfurthermore divided into two petroleum-entrapped systems in the Wenjisang-Qiudong area.The firstpetroleum- entrapped system is from the Early and Middle Jurassic to the end of Paleogene,in which theactive period of the pool-formation is from the end of Jurassic to the Early Cretaceous, and the second isfrom Neogene to Quaternary, in which the active period is since the end of Neogene.According to thedevolopment of the fuild potential field, the relationship between the petroleum-entrapped evolution andthe hydrocarbon accumulation was analized.Furthermore, the petroleum-entrapped models were stud-ied, and it was suggested that the Wenjisang oil- pool was holded in the first petroleum-entrapped sys-tem, mainly with oil, and that the oil and gas were shared the importance in the Miden field, and thatthe Qiudong field was formed in the second petroleum-entrapped system as a gas pool.
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Key words:
- fluid potential /
- petroleum-entrapped system /
- oil ＆ gas accumulation /
- Wenjisang- Qi-udong area /
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