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鄂尔多斯盆地姬塬地区长9油层组展示了较好的勘探前景,但对其成藏机制方面的研究却相对薄弱,成为制约勘探的难题。该文应用油藏地球化学、成藏地质学和沉积学等研究手段和方法,探讨了油气来源、运移、运移动力、运聚方式等问题。结果表明:姬塬地区长9油层组原油来源于上部长7油层组的优质烃源岩;长7烃源岩生烃增压产生的异常高压、长7与长9油层组过剩压力差是长7烃类向长9储层运移的主要动力;纵向叠置、横向上连片的砂体和区域性构造活动形成的裂缝为沟通长7优质烃源岩和长9油层组储层的优势运移通道。
The Chang 9 oil layer in the Jiyuan area of the Ordos Basin shows a good exploration prospect, but the research on its mechanism of formation is relatively weak, which has become a problem that restricts exploration. In this paper, the research methods and methods of reservoir geochemistry, reservoir forming geology and sedimentology are applied to discuss the source of hydrocarbon, migration, motive force of migration and the mode of transportation and accumulation. The results show that the crude oil from Chang 9 oil layer in Jiyuan area originated from high-quality source rock of Upper Chang 7 oil layer. The abnormal high pressure from Chang 7 oil source rock produced by hydrocarbon generation and pressurization, and the excess pressure difference between Chang 7 and Chang 9 oil reservoirs was 7 The main motive force for the migration of hydrocarbons to Chang 9 reservoir; the longitudinally superimposed and laterally contiguous sand bodies and the fractures formed by regional tectonic activities are the dominant transport modes for the communication between the reservoirs of Chang 7 high-quality source rock and Chang 9 reservoir Move channel.