自定义响应方程的测井最优化处理方法

Logging Optimization Processing Method with User-defined Response Equation

目前在用的测井最优化处理方法中涉及的响应方程均为预先定义的固定形式,由于其类型有限,因而针对复杂储层处理的适应性和计算精度都受到影响。针对这一问题,提出了一种基于表达式解析的体外自定义响应方程测井最优化处理方法。通过解析用户输入方程的组成元素,建立与之对应的计算机自动求导、求值算法;针对非线性目标函数求解,提出惩罚函数结合Levenberg-Marquardt的改进算法。现场应用表明,新方法有助于提升测井数据处理的适用性和解释结果的精度。

At present, response equations involved in the logging optimization processing method are predefined fixed forms. Because of its limited types, the adaptability and calculation precision to the complex reservoir processing are affected. To solve this problem, this paper presents a logging optimization processing method with external user-defined response equation based on the expression analysis technology. Through element analysis of user-input equation, the corresponding automatic computer calculation algorithm of expression derivation and evaluation is established. To solve the nonlinear objective function, the improved algorithm of the penalty function combined with Levenberg-Marquardt is proposed. Application results show that the new method can help to improve the applicability of logging data processing and the accuracy of interpretation results.