用函数积分法确定各种孔隙结构的实用参数

由毛管压力资料所求得的各种孔隙结构的实用参数,由于测量技术的限制,因毛管压力曲线的极值部分不可靠性和计算时选样点密度的不确定性,使计算结果因人而异,是多变的.毛管半径的函数表达式可使各种实用参数的计算由积分法进行,免去了原离散级数法的缺陷.毛管半径与含水饱和度的关系为幂函数,其系数和指数可在双对数纸座标上以图解法或用计算机以回归法,用可靠的测量结果予以确定;用函数法和积分法求出的各种实用参数不仅可变性小,且方法简单,所用参数也少,一般微机即可完成各种计算.

Determination of Practical Parameters of Various Pore Structures by Functional Integral Method

: Because of the .limitation of the survey techniques, the unreliability of the extreme value of capillary pressure curve and the uncertainty of sampling spot density,the practical parameters of various pore structures obtained from capillary pressure data are changeful. The calculated results differ with different persons. The functional expression of capillary radius makes it possible to calculate various practical parameters by integral method,which avoids the defects of original series of dispersion. The relation between the capillary radius and water saturation is power function. Its coefficient and index can be determined by reliable surveyed results by using the diagram on double logarithmic paper or by regression with a computer. Various practicable parameters calculated by functional integral method are less changeable. The method is simple and the parameters used for calculation are fewer. All kinds of calculation can be done with oridinary computers.