In physics and mathematics, the phase of a wave or other periodic function F {\displaystyle F} of some real variable t {\displaystyle t} is an angle-like quantity representing the fraction of the cycle covered up to t {\displaystyle t}.
In reflection seismology, a polarity reversal or phase change is a local amplitude seismic attribute anomaly that can indicate the presence of hydrocarbons and is therefore known as a direct hydrocarbon indicator.
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