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张中庆等；特征化与双感应测井反演技术，测井技术，１９９６（４）２０，２６１～２６７。本文提出特征化的概念，即测井曲线的有效信息包含在曲线的极值点和拐点上，这些点被称之为测井曲线的特征点。特征点包含了测井曲线的所有信息，反演过程采用最小二乘法，使得推测模型的合成测井曲线与实际测井曲线的差的平方和达到最小。反演建立在正演算法基础上，用混合法做模型的合成测井曲线，并且只对特征点深度进行合成，反复修改模型，当达到一定收敛准则时，停止选代。
Zhang Zhongqing et al; Characterization and double-sensing logging inversion technique, logging technology, 1996 (4) 20, 261 ~ 267. In this paper, the concept of characterization is proposed. That is, effective information of well logs is included in the extreme points and inflexions of the curves. These points are called as feature points of the well logs. The feature points contain all the information of the well logs. The least squares method is used in the inversion process to minimize the sum of the squares of the differences between the synthetic well logs and the actual well logs. Based on the forward algorithm, synthetic logging curves are modeled by the hybrid method. Only the depth of the feature points is synthesized and the model is repeatedly modified. When a certain convergence criterion is reached, the selection is stopped.