盖层物性封闭力学机制新认识

Reevaluation of Caprock Physical Sealing Mechanic

根据渗流力学原理,建立了包含边界层阻力的盖层物性封闭能力的力学方程,边界层阻力以启动压力梯度表征,该方程表明:盖层的物性封闭烃类能力取决于毛细管力、盖层厚度和边界层阻力。并用模拟实验和文献资料验证了盖层厚度及烃类流体性质对盖层物性封闭能力的影响。认为深入理解盖层厚度和边界层阻力对盖层物性封闭的影响,将有利于发现特殊盖层,解放更多的油气资源。

Based on fluid mechanics in porous medium, a new mechanical equation of sealing ability of caprock to hydrocarbons was established in this paper, in which the resistive force of boundary layer was represented as threshold pressure gradient. This equation indicated that the sealing ability of caprock was determined by capillary force, caprock thickness and resistive force of boundary layer（threshold pressure gradient）. We used the simulating experiments and published files to test the effects of caprock thickness and hydrocarbon property on the sealing ability of caprock. To understand the effects of the threshold pressure gradient and caprock thickness on the sealing ability of caproek is be favor of discovering special caprocks and more oil and gas resource.