Then the waveforms in the window are performed with FFT and the formation wave energy is calculated in frequency domain.
然后对时窗内的波形作快速傅立叶变换，在频域内求地层波能量。
The results obtained indicate that the center frequency of cased wave is obviously higher than that of formation wave in fast formation.
分析研究表明，快速地层水泥完全胶结时的地层波与套管波的主频差别较大，套管波主频明显偏高。
When using CBL-VDL logging information to carry out cement bond evaluation, formation wave energy is major sign to reflect the second interface cement degree.
在利用CB L-VDL测井资料进行水泥胶结评价时，地层波能量是反映第二界面水泥胶结好坏的主要标志。
Formation wave is weaker than the casing wave.
相对于套管波，地层波很弱。
Formation wave is weaker than the casing wave.
相对于套管波，地层波很弱。
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