塔里木碳酸盐岩储层最优化测井解释方法

OPTIMIZED LOG INTERPRETATION FOR CARBONATE RESERVOIRS IN TARIM BASIN

塔中和轮南地区奥陶系碳酸盐岩储集层不仅基质孔隙度低 ,而且裂缝、溶洞的产状和分布复杂多变 ,这给常规测井解释方法带来很大的困难。在综合分析多种最优化测井解释方法的基础上 ,根据测井响应方程和误差理论建立目标函数 ,采用多维搜索的变尺度法与一维搜索的抛物线插值法相结合的最优化方法 ,经过适当的算法改进 ,对该区多口井的测井资料进行了逐点处理。结果表明 ,该方法用于碳酸盐岩储层测井解释效果良好 。

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 multi-dimensional 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.