Forming Mechanism And Enrichment Rules Of Reservoirs In Taizhou And Funing Formations, Subei Basin

Based on the data of geology, geochemistry and geophysics, adopting the comprehensive research method, this paper gives a comprehensive research on the Forming Mechanism and Enrichment Rules of Reservoirs in Taizhou and Funing formations, Subei Basin. Through the research on the hydrocarbon generation and expulsion history, oil-source correlation, fault sealing and hydrocarbon conduits system, has obtained the following results and recognitions:Based on detailed oil-source correlation, the relationship between mature source rock and oil accumulation has been illustrated, and proposed the distributed characteristic, oil accumulation conditions, forming pattern of mixed oils. Indicated through the hydrocarbon generation and expulsion history, the western source rock is earlier than the eastern part entered the mature stage. Union homogenization temperature analysis, has been clear about the time of oil migration and accumulation. Combined with the application of sand body distribution, faults development and sealing, the conduit system can be divided into three types: fault conduction, sand body conduction and fault-sand body conduction. Clarified the way and dynamic of hydrocarbon expulsion: the hydrocarbon from E₁f₄ source rock mainly migrates upward, which from E₁f₂ and K₂t₂ ource rock mainly migrates downward. The characteristics of interval transit time in mudstone and paleopressure from inclusion indicate: the main oil-bearing series in reservoir forming time generally present overpressure, but the current series mainly are normal pressure because of the late denudation and undercompensation. Consummated the region of interest forming patterns, which was divided 3 styles and 6 sub-styles. Summarized the petroleum enrichment rules and controlling factors of fault-block oil reservoirs.