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压力封闭是与毛细管封闭明显不同的盖层封油气机理，主要是靠盖层与储集层之间孔隙流体压力差来封闭油气的，它既可封闭游离相的油气，又可封闭水溶相的油气。压力封闭的形成仅存在于具有欠压实的泥岩盖层中，其封闭能力的大小可根据等效深度法和利用声波时差值计算得到。松辽盆地三肇凹陷下白垩统青山口组和嫩江组一、二段泥岩盖层普遍欠压实，孔隙流体具异常高压，最大可分别达到１５ＭＰａ和１０ＭＰａ，具有与毛细管封闭能力基本相当的压力封闭能力，对该区油气的聚集与保存起到了十分重要的控制作用。
Pressure sealing is obviously different from the caprock sealing caprock mechanism, mainly by the cap layer and the reservoir pore fluid pressure difference between the closed oil and gas, it can shut down the free phase of the oil and gas, but also close the water phase Oil and gas. The formation of pressure seal exists only in under-compacted mudstone caprock, and its sealing capacity can be calculated based on the equivalent depth method and using acoustic time difference. The Lower Cretaceous Qingshankou Formation and the Nenjiang Formation mudstone caprock in the Songzao Basin are generally undercompacted, and the pore fluids have abnormally high pressures up to 15 MPa and 10 MPa, respectively, with pressures comparable with those of the capillary closure Closure capabilities, the accumulation and preservation of oil and gas in the area played a very important role in the control.