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为研究断陷盆地中烃类流体的运动特征,对断陷盆地中烃源岩的分布、排烃过程及油气二次运移通道及过程进行了分析。结果表明,断陷盆地中烃源岩的分布存在强烈的非均一性,宏观上烃源岩的分布呈现旋回式,微观上烃源岩分布具有一定的波动性。非均一性是烃类运移的本质特征,烃类运移存在优先的运移方向、通道及目标。流体压裂是驱动超压封存箱幕式演化的重要方式,随着超压封存箱的幕式演化,烃类进行幕式排放、幕式运移及幕式成藏。在烃源岩体系中讨论不同规模盆地内油气的运移规律时,应该充分考虑到油气运移通道的不连通性,重视突变性的油气运移规律。
In order to study the movement characteristics of hydrocarbon fluids in faulted basins, the distribution of hydrocarbon source rocks, hydrocarbon expulsion processes and secondary migration channels and processes in fault basins are analyzed. The results show that there is a strong heterogeneity in the distribution of source rocks in the fault-depression basin, and the distribution of source rocks is swirling in the macroscopic view. The micro-source rock distribution has some fluctuations. Inhomogeneity is the essential feature of hydrocarbon migration. There are preferential transport directions, channels and targets for hydrocarbon migration. Fluid fracturing is an important way to drive the curtain evolution of overpressure enclosure. With the curtain evolution of overpressure enclosure, the hydrocarbons are discharged in the form of curtain, the migration of the curtain and the curtain accumulation. When discussing hydrocarbon migration rules in different size basins in source rocks, we should fully take into account the discontinuity of hydrocarbon migration path and pay attention to the law of catastrophic hydrocarbon migration.