Milankovitch cycles could be identified through spectral technique of well logs; accommodation curve reflecting base level cycles could be established by means of corrected Fischer plot.

• （2）在对测井曲线进行谱分析识别出米兰柯维奇旋回的基础上，采用校正的费希尔图解方法可编制出反映基准面变化的可容纳空间变化曲线。