Abstract:

In order to comprehensively evaluate the Chang-6₁ formation in Jiyuan area, we combined the cluster analysis with the gray correlative analytical method, selected the relative independent evaluation parameters from a number of parameters by hierarchic cluster analysis, and get the weight coefficient of every evaluation parameter by the gray correlative analytical method, and then obtained the comprehensive evaluation index REI. According to the value of REI, the reservoir is divided into four categories. And combined with the sedimentary facies, it is found that the high quality reservoir is in the central part of the main channel, indicating that the reservoir characteristics are closely related to the sedimentary environment. It is also shown that the combination of the cluster analysis and the gray correlative analytical method provides a new way for the reservoir evaluation, and the result has higher credibility.

Key words: cluster analysis, gray correlation, reservoir evaluation, Jiyuan area