由于准则方程的高次非线性和复杂性，文中利用复合函数求导法则，直接针对基本随机变量求解。
Because of the complexity and high order nonlinear property of the criterion, a derivative method for compound function is used to get reliability.
该方法利用最大似然准则建立目标函数，同时利用非线性共轭梯度法来优化求解目标函数。
The objective function was established based on the maximum likelihood rule, which was solved by nonlinear conjugate gradient method.
根据测井曲线，运用费歇准则导出了识别砂岩油层大孔道的判别函数，判别函数是测井曲线的线性组合。
In the paper, the discriminant function is derived from the Fisher principle to distinguish large pore paths in sandstone oil layers based on logging curves.
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