Clustering method for identification of oil(gas)-bearing formation and water-bearing formation based on information entropy
Heping Pan · 2004
The basic concepts of uncertainty, information entropy, united entropy, term entropy and mutual information were introduced briefly. The probability distribution of the fluid attribution in the oil (gas)-bearing formation or water-bearing formation where characteristic parameters occurred, was applied to united entropy. The probability distribution is the distance function between characteristic parameter X and the characteristic parameter Y of fluid. A method for identification of the fluid type by using the mutual information of the difference between entropy and term entropy was proposed, namely the clustering method for identification of the oil (gas)-bearing formation and water-bearing formation on the basis of information entropy. The characteristic parameters of the oil (gas), water-bearing formation were withdrawn by using well logging data. The oil (gas)-bearing formation and water-bearing formation were identified by the clustering method. The identifying results agree with the test oil conclusion. The clustering method can be used not only in the identification of the oil (gas)-bearing formation and water-bearing formation, but also in the demarcation of rock.