临界方程法及其对地层性质的自动化判定

从分析折射波时距曲线入手，确定地层性质突变的临界点，利用通过该点时距曲线的时距方程，建立临界方程和临界方程法，以临界方程计算出的地层临界厚度值与待判层厚度无关，二者比值决定了待判地层性质。

CRITICAL EQUATION METHOD AND AUTO-DETERMINATION OF STRATA'S CHARACTERISTICS

First, the time-distance curves of refraction waves are analysed to find out the critical point where the strata's characteristics degenerated. Then based on the time-distance equations which go through the critical point, the critical equation and the critical equation method can be constructed. The critical stratum thickness calculated from the critical equation has nothing to do with the real thickness of the strata. The ratio of the critical thickness and the real thickness of a stratum determines the characteristics of the stratum. Such method, based on the above principles, is named critical equation method. It is a brandnew quantitative method for the determination of the characteristics of a stratum and can easily be applied to computer. Compared with the traditional methods, it has two main merits: firstly, it can give out a quantitative critical value which symbolizes degeneration of strata's characteristics; secondly, it can give out results of determination automatically. Results of this method on some models and actual data are given in this article.