浅谈最优化算法在测井解释中的应用

The Brief Analysis of the Optimization Algorithm in the Well Logging Interpretation

常规的测井解释方法采用固定的解释模型,运用有限的几条测井曲线进行储层解释,适用于地形条件好、构造模式简单的地层结构。但是对于构造复杂的储层进行解释时,解释精度不能得到保证,缺乏说服力。因此笔者结合前人的经验,对于复杂的地质构造采用最优化算法进行解释。它根据广义的地球物理反演原理,充分运用地质资料和测井资料,根据非线性加权最小二乘法原理和误差理论建立多模型响应方程组,求解模型拟合的测井曲线与实际曲线之间的残差。当残差达到所设定的极小值范围时,则所求得的最优解最能反映地下的地质情况。

The conventional well logging interpretation adopts the settled interpretation model, and applies a limited number of logging curves for reservoir interpretation. It is ap- plicable for the stratigraphic texture where the terrain condition is good and the structure pattern is simple. However, when the conventional well logging interpretation is applied to the reservoir whose structure is complex, its interpretation accuracy can＇t be convinced, and it is short of persuasiveness. Therefore, the complex geological structure with the opti- mization algorithm is interpreted, combining with the experience o{ predecessors. It is based on the generalized principle of geophysical inversion. And geological data and logging data are made full use and multi-model response equations with the non--linear weighted least square method and the error theory, and the residual error between the modeling log- ging curves and actual logging curves is solved. When the residual error is in the minimum range, the optimal solution can reflect the geological conditions best.