Abstract:

Several usual distribution types of capillary pressure curves have been strictly established in the same coordinate system Thereby, different distributions of usual types of capillary pressure curves can be distinguished in the same coordinate system. The key point in determining the distribution of capillary pressure curves is to test the results, in this way, the results cannot be influenced by the personal factor, and multiple answers can be avoided The calculation formulae from normal distribution have been described mathematically.The calculation results have been obtained by using (chi)distribution data.The influence of the difference between typical curves and actual curves upon the results obtained by the normal distribution method is expounded in this paper.The results must be tested by statistical parameters besides hypothesis testing by probability.The bistribution of the curve can be determined correctly not simply by using statistical character parametrs，but by using typical curves fitting actual curves (or data points). The usual difference between the results of the statistical method (momentmethod) and those of normal distribution is also explained here.

Key words: Capillary pressure, Curve, Distribution characteristics, Normal distribution, X~2 distribution