Methods According to the limearized theory and the weakly nonlinear theory, the perturbation method is used. 方法根据线性化理论与弱的非线性理论，运用奇异摄动的方法进行研究。
It is suggested that nonlinear theory should be set up on the basis of formation heterogeneity to realize localizable measurements. 建议测井技术的发展要从非均质地层出发，建立非线性理论，实现局域化测量。
