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目前，盖层封闭性研究由于受并点数、取心和实验经费等因素的限制，只能用有限个实验数据来研究盖层的封闭能力，使盖层评价的准确性受到影响。本文为了获取更多的盖层封闭性信息，在分析盖层毛细管和压力封闭机理及主要影响因素的基础上，通过声波时差与泥岩排替压力、声波时差与泥岩异常孔隙流体压力之间的函数关系的确定，讨论了利用声波时差研究泥岩盖层毛细管封闭能力在剖面上和平面上的变化特征，以及压力封闭能力和其形成时期的方法，为盖层封闭性的准确评价提供了可靠依据。
At present, there are only a limited number of experimental data to study the caprock closure ability of the caprock closure study due to the limitation of the number of points, coring and experimental funding, which hinders the accuracy of caprock evaluation. In order to get more information about caprock closure, based on the analysis of capillaries and pressure-sealing mechanisms and the main influencing factors, the relationship between acoustic time-lapse and mud-rock displacement pressure, acoustic time difference and pressure of mudstone anomalous pore fluid The relationship between the caprock caprock sealing ability and the sealing ability and the formation time of the mudstone caprock is discussed. It provides a reliable basis for accurate evaluation of caprock closure.