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油田水中存在“沉积承压水”和“地表渗入水”两个相对独立而又相互作用的水动力系统，前者由上覆地层重量所引起的地静压力以及地静压力等引起的异常孔隙流体压力所形成，具有内循环承压式水交替特征，后者为大气降水和地表水向储集层的渗入而形成，以外循环渗入或水交替为特征。这两大系统（尤其是前者）的作用在很大程度上控制了含油气盆地中油气的运移、聚集和保存，油气聚集区主要位于水文地质带中的交管阻滞一停滞带内，沉积交替强度的低值区是油气富集区，沉积水的离心流使凹陷中的油气围绕凹陷中心呈带状分布。
There are two relatively independent and interact hydrodynamic systems in the water of the reservoir, such as “sedimentary confined water” and “infiltration of surface water”. The former is caused by the overpressure of the overburden, the hydrostatic pressure and the hydrostatic pressure. Pressure formed by the inner circulation of pressure-bearing water alternating features, the latter for the formation of atmospheric precipitation and surface water into the reservoir infiltration, the outer cycle of infiltration or water alternate features. The role of these two systems (especially the former) largely controls the migration, accumulation and preservation of oil and gas in the petroliferous basins. The hydrocarbon accumulation areas are mainly located in a stagnant zone of the tube block in the hydrogeological belt. Sediments The low intensity area of alternating intensity is an oil and gas rich area. The centrifugal flow of sedimentary water distributes the oil and gas in the depression around the center of the depression.