Translations:Phase rotation/22/en

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In matching two surveys, one might tend to think that the first survey is either in phase or out of phase with the second survey. In other words, one tends to think in terms of either positive polarity (corresponding to a phase rotation of ) or negative polarity (corresponding to a phase rotation of ). However, the dichotomy of either normal polarity or reverse polarity is not adequate for matching the wide variation of phase shifts that occurs in recording and processing. Accurate phase corrections are vital when one is dealing with synthetic logs. Seismic records show phase shifts other than for different configurations of recording instruments. As a result, seismic sections from different surveys usually do not tie adequately. A simple reversal of polarity on one section can improve the tie at some levels, but it usually makes other ties worse. Proper phase matching is vital.