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中文摘要：
超压封存箱的封闭机制研究是封存箱研究中的难点之一,倍受许多专家学者关注。深入研究和揭示封隔层的封存机制和异常高压的保存时间对超压成因和油气成藏条件诸多方面的研究都非常重要。已有的关于异常高压的封闭机制研究可分为静态和动态两种观点。静态观点认为：极低渗透率（渗透率〈10-11μm2）的致密岩层可作为封闭层阻止流体流动,如蒸发岩或经历强烈碳酸盐矿化作用的碎屑岩可形成近于非渗透性岩层从而形成有效封闭;在砂泥岩频繁互层的地层中,气-水两相界面可产生足够大的毛细管压力,而且毛细管压力具有可叠加性,进而形成有效封闭。动态观点认为：在封存箱和封闭层处于连续水相的地质环境中,剩余压力将通过低速扩散方式逐步同其环境压力达到平衡,但由于异常高压通过低渗透岩层（渗透率〈10-8~10-10μm2）的扩散速度极其缓慢,从而也可使封存系统长期保持超压状态。超压封闭机制的静态和动态两种观点都各自具有事实依据,但具有普遍意义的封存机制可能是气-水两相界面毛细管压力封闭和低速扩散机制。
英文摘要：
Mechanism for pressure seal is still a baffling problem in pressure compartment research,and attracts much attention from researchers.Knowledge of the time scales over which these abnormal pressures are maintained is essential for understanding the processes of oil and gas generation,migration and conservation.Generally there are two directly different conceptions of abnormal pressure seal mechanisms ： the static and the dynamic.The static school deems that rocks,which are nearly impermeable（permeability10-11 μm2）,can prevent almost all movements of fluids,such as evaporites and intensively mineralized rocks can act as pressure seals.While the gas coming out of solution form gas-saturated water in layered sequences of fine and coarse-grained rocks can bring enormous capillary pressure to seal the abnormal pressures and the capillary pressure is additive.In contrast,the dynamic school claims that both compartment and seals in a water face continued environment the abnormal pressures will be balanced at low rate diffusion even with the existence of low permeability seals（permeability10-8—10-10 μm2）,which have excellent seal ability to prevent water movements.However,the low permeability rocks can reduce the dissipation rates of anomalous pressures to an extremely low level.In other words the pressures are maintained in a long period.The static and dynamic overpressure seal mechanisms have their own factual basis,but gas-water of two phase capillary pressure and low rate diffusion seal mechanisms may have more universal meaning.
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Formation mechanism of carbonate cemented zones adjacent to the top overpressured surface in the cen
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