盖层有效封盖厚度定量分析

为了定量分析盖层的封盖能力,从盖层厚度中引伸出了盖层有效封盖厚度(He)的概念.它是盖层层面倾角的函数,同时受裂缝切割深度、断层落差大小及断层纵、侧向封启性等因素的影响.文中从几何学角度,在分析盖层有效封盖厚度与盖层倾角之间定量关系的基础上,分别讨论了盖层被裂缝和断层破坏或改造的条件下,有效厚度的求算方法.结果表明,对确定的盖层,其有效封盖厚度值不是常数.而是随时空变化的动态几何参数.有效封盖厚度对油气藏形成与破坏的定量研究很有意义.

QUANTITATIVE ANALYSIS OF EFFECTIVE SEAL ROCK THICKNESS

In order to analyze quantitatively seal ability of seal rocks,the concept of effective seal rock thickness (He)is drawn on the basis of seal rocks thickness. Studies indicate that the effective seal rock thickness is a function of seal rock dip.besides,it is impacted by cracking depth and fault throw. On the basis of geometry,authors analyze quantitatively the relationship between effective seal rock thickness and seal rock dip, and respectively discuss the calculation method of it on faulted or cracked seal rock. The results indicate that the effective seal rock thickness ,for a certain seal rock, is not a constant, but a dynamic geometry parameter ,study of which appears very important to the quantitative study of formation or destruction of oil and gas pools.