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准噶尔盆地白家海凸起北临东道海子凹陷,南靠阜康凹陷,东接五彩湾凹陷,是油气聚集的有利指向区。通过对比研究区周缘生烃凹陷的烃源岩和原油地球化学特征,并结合流体包裹体分析和盆地模拟技术,对白家海凸起二叠系、三叠系油气的来源、成藏期次以及成藏模式进行了探讨。结果表明白家海凸起二叠系、三叠系油气主要来自于北部的东道海子凹陷二叠系平地泉组烃源岩。油气发生过两期充注:第一期从白垩纪早期持续到白垩纪末期,第二期从白垩纪末期持续到第四纪,为油气充注高峰期。综合研究区构造特征和油气成藏过程,建立了二叠系和三叠系近源充注、断裂高效输导、先油后气充注、晚期调整成藏的油气成藏模式。
The Baijian Sea in the Junggar Basin is bounded by Dongdao Haizi depression in the north, Fukang depression in the south and Wucaiwan depression in the east, which is a favorable point for hydrocarbon accumulation. By comparing the geochemical characteristics of source rock and crude oil in the hydrocarbon generating depression at the periphery of the study area, and combining the analysis of fluid inclusion and basin modeling techniques, the source and reservoir-forming stages of the Permian and Triassic hydrocarbon in the Baijiahai area, Accumulation patterns were discussed. The results show that the Permian and Triassic hydrocarbons in the Baijiahai are mainly derived from the Permian Pingdiquan Formation source rocks in the Dongdaohaizi Sag, northern China. There were two periods of oil and gas filling: the first period continued from the early Cretaceous to the end of Cretaceous, and the second period lasted from the end of Cretaceous to Quaternary, filling the peak period of oil and gas. Based on the tectonic characteristics of the study area and the process of oil and gas accumulation, the reservoir-forming modes of Permian and Triassic near-source charge and fracture, high-efficiency oil and gas migration, and later-stage reservoir adjustment were established.