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沉积盆地流体动力学特征是盆地分析的主要内容,对烃源岩热演化及油气成藏具有重要的影响。以歧口凹陷为例,通过大量实测数据和分析化验资料综合分析,探讨了古近系中深层流体压力特征及对成烃演化的抑制作用,建立了超压背景下的烃源岩成烃演化模式,指出了超压存在的石油地质意义。研究表明,歧口凹陷中深层普遍发育异常高压,压力系数为1.2~1.6,属于“正常地温梯度、异常高压”环境,这种环境对古近系中深层烃源岩热演化具有明显的控制作用。超压的普遍发育对歧口凹陷中深层的液态烃下限、有效储层下限、油气保存及有效勘探深度都有十分重要的影响。
Hydrodynamic characteristics of sedimentary basins are the main contents of basin analysis and have an important influence on thermal evolution of hydrocarbon source rocks and hydrocarbon accumulation. Taking Qikou depression as an example, through comprehensive analysis of a large number of measured data and analytical laboratory data, the pressure characteristics of mid-deep fluid in the Paleogene and its inhibition on hydrocarbon evolution are discussed, and the hydrocarbon evolution and evolution mode of source rocks under overpressure is established , Pointed out the existence of petroleum over the pressure of geological significance. The results show that the depression in the middle and deep of Qikou depression is generally under abnormally high pressure with a pressure coefficient of 1.2-1.6, which belongs to the “normal geothermal gradient, abnormally high pressure” environment. This environment has obvious effects on the thermal evolution of middle- Control effect. The general development of overpressure has a very important influence on the lower limit of liquid hydrocarbons, the lower limit of effective reservoirs, the preservation of oil and gas and the effective exploration depth in the Qikou sag.