Abstract: Polarity of seismic wave is well concerned by geophysicists for its effect on accuracy of geologic calibration of horizons on a seismic profile. When composite traces or YSP information is inconsistent with events of some seismic data, this is not something the matter for the seismic data but the polarity. With correct estimation of the polarity, the reliability of seismic interpretation results can be improved. For the static correction of low-velocity layer, and with complicated topography and fairly big thickness of low-velocity layer, using vertical depth to estimate the amount of static correction will appear a certain of errors that are not allowed, and the normal depth of dip plane should be considered for it. In low signal-to-noise ratio and low dip angle (or complex folded zone), velocity information like retrograde phenomenon should be paid more attention to. For retrograde point of seismic velocity tends to be breaking point of fault in velocity spectrum of corresponding seismic profile, hence, systematic processing of these breaking points could obtain real fault localization.

Key words: seismic profile, polarity, static correction, seismic velocity, fault