Studying reservoir heterogeneity by Analytic Hierarchy Process and Fuzzy Logic, case study of Es1x formation of the Wang guan tun oilfield, China

The results show that the disadvantages of a single parameter are overcome. The CI is more reasonable and comprehensive, and the predicted CI between wells is more in line with geologic law under the constraints of the LRM. Most importantly there is a good correlation between the remaining oil enrichment area and the area CI > 0.5 in the contour map of the composite index (CMCI); therefore, the CMCI can be used to predict the distribution of remaining oil and improve oil recovery.