Abstract:

In Tarim basin, the Ordovician carbonate reservoirs are low in matrix porosity and complex and highly variable in terms of occurrence and distribution of fractures and vugs, which often renders great difficulties to routine log interpretation. In this paper, an optimization method of log interpretation is proposed to cope with such difficulties. In the method, an objective functions is built on the basis of log response equations and error theory, and multidimensional changing- scale method is combined with single - dimensional parabola - interposing method, with the algorithms properly modified. About 40 wells were processed point by point by using the method, and the results have been satisfactory, showing promising applicability of
the method in carbonate reservoir log interpretation.

Key words: carbonate reservoir, log interpretation, optimization method, Tarim basin