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东濮凹陷文留地区的地层普遍发育超压甚至强超压系统。超压与地层有机质热演化反应过程存在复杂的相关性。深层盐下、盐间地层有机质的热演化受强超压的影响,不同热演化反应过程不同程度地受到抑制作用:镜质体反射率演化正常;烃类裂解以及烃类结构演化在深层强超压作用下受到抑制作用。有机质热演化过程中的超压抑制为深层源岩成烃提供了更为有利的条件,是文留地区深层天然气成藏的主要因素。
The strata in Wenliu area of Dongpu Depression generally develop overpressure and even strong overpressure systems. There is a complex correlation between overpressure and thermal evolution of organic matter in the stratum. Under deep salt, the thermal evolution of organic matter in inter-salt strata is affected by strong overpressure, and the different thermal evolution reaction processes are inhibited to varying degrees: the vitrinite reflectance evolution is normal; the hydrocarbon cracking and the evolution of hydrocarbon structure in deep super strong Under pressure is inhibited. The overpressure suppression during the thermal evolution of organic matter provides more favorable conditions for the hydrocarbon generation of deep source rocks and is the major factor for the formation of deep natural gas in Wenliu area.