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本文介绍了一种传统的用全波声波资料(FWS)现场计算视纵波衰减因子的修正方法。衰减因子(Q_p~(-1))可以在两个频率点处用远近两个接收器组的傅里叶频谱比来求取。这种方法的优点是我们不必知道如何校正频谱的几何扩散损失。 修正后的方法已经成功地应用于FWS资料。此FWS资料是在Oberpfalz地区KTB井(德国大陆超深钻井计划)随钻测量时记录的。此法产生了比频谱法更为稳定的结果,使我们可以获得连续的等间隔的衰减因素Q_p的测井曲线Q_p—log。Q_p—log可以提供地震波沿井壁传播衰减的详细信息。它可以和其它声测井(τ_p—log)及用VSP资料估算的衰减等对比,以取得更佳的地震波衰减的岩性解释结果。
In this paper, a traditional method of correcting the P-wave attenuation factor in the field with full-wave acoustic wave data (FWS) is introduced. The attenuation factor (Q_p ~ (-1)) can be found at two frequency points using the Fourier spectral ratio of the two receiver groups. The advantage of this approach is that we do not have to know how to correct the geometric spread loss of the spectrum. The revised method has been successfully applied to FWS data. This FWS data was recorded while drilling at the KTB well in the Oberpfalz region (German ultra-deep well drilling program). This method produces a more stable result than the spectral method, allowing us to obtain the log Q_p-log of continuous, equally spaced attenuation factors, Q_p. Q_p-log provides detailed information on the attenuation of seismic waves propagating along the borehole wall. It can be compared with other acoustic logging (τ_p-log) and attenuation estimated with VSP data to obtain better interpretation of seismic interpretation of seismic attenuation.