最优化方法在复杂岩性储层测井解释中的应用

在综合分析多种测井解释方法的基础上,通过将测井响应方程线性化,建立多矿物地层组份测井解释模型,用Householder变换求解超定线性方程组的最小二乘解,将每一个最小二乘解作为共轭梯度优化迭代的初始值进行运算,求取复杂岩性地层组份.根据此原理用Visual C++ 6.0编程,并处理某地区复杂岩性的碎屑岩地层和碳酸盐岩地层的测井资料,结果表明,处理100 m的井段所用时间不足1 s,处理1 000 m的井段所用时间不足10 s,计算的孔隙度与岩心分析孔隙度有很好的一致性,效果良好.

Application of the Optimization Method to Complex Lithology Reservoir Log Interpretation

On the basis of analyzing many log interpretation methods,a new log interpretation model for multiple formation mineral compositions is established,and the linear constrained least square method is introduced to set up optimized log interpretation math model.By linearizing the log response equations,the Householder Transformation is used to gain least square solutions of the over-determined linear equation group,and with each least square solution as initial value of the conjugate optimization algorithm,we ...