Abstract: In this paper,frequency spectrum and cross power spectrum of full acoustic waveform from acoustic waveform logs are calculated.Investigation on the contiguous frequency band (consistant frequency band)in DPD method is carried out,which is used to determine the P-wave and S-wave slowness.It is pointed out that,if the difference of the moveout determined with the contiguous band and the moveout calculated with the shear wave arrivals is less than one cycle of shear wave,the computed slowness is resonable,otherwise it is not reliable.

摘要： 从分析长源距声波全波列测井野外带记录的全波列波形的波谱入手,对DPD法纵横波提取中由相邻一致频带求取最佳窗移值的方法进行了研究,结果认为,当由相邻一致频带确定的窗移值与横波至点确定的窗移值相差不到一个横波周期时,该法具有很强的补偿能力,能求得较精确的横波时差;反之,则会出现一个或多个横波周期的误差.

关键词: 声波全波列测井, 测井数据处理, 横波—纵波, 声波时差