The Robust Frequency-depended Attenuation Extraction from Multichannel Sonic

Despite obvious benefit of using the attenuation as additional petrophysical parameter it still not widely used. The problem is the difficulty of measurement from fullwave sonic. We propose a modification of the spectral relations method basing on reciprocity principle. Synthetic tests demonstrate a significant improvement of accuracy and reliability of estimates. Real data processing showed that P-wave attenuation is very small in acoustic frequency range and is not a diagnostic parameter. S-wave attenuation waves increases sharply in interval of gas- and oil-saturated reservoir and can be used for joint logs interpretation.