摘要
本文针对现有的全波列中有用信息的方法——相关对比法和互功率谱相位法的缺点,提出了精确提取纵波和横渡时差的现代谱分析法——最大熵法,并编出了该方法的数据处理软件,对某井段的声波测井数据试算的结果证明,该方法优于常规方法。本方法在提取纵波、横波信息时,不仅消除了相关对比法中由于采样间隔所引起的误差,同时也克服了经典谱分析中的旁瓣效应及频移现象。它还具有在采样长度很短的情况下,分辨率仍然很高的优点。
Aiming against the shortcomings of present correlation method and mutual power spec-tral phase method, a modern spectral method extracting accurate compressional and shearwave travel time difference is proposed, which is maximum entrapy method. The softwareaccording to this method has been developed and used for data processing of acoustic log in ainterval of oil well. The results show that this method is better than conventionalmethods. This extraction method not only eliminates the error in correlation method causedby sampling intervals, but also overcomes thc side lobe effect and frequency shift phenome-non. It has another stong point as well that resolution for short sampling interval is stillhigh.
