This invention provides a method for calculating the minimum
delay time between two seismic traces: Calculating a first error value between the two seismic traces under at least three first
delay times (either preset or obtained after the last iteration update); fitting an
error function between the
delay time and the error value; calculating a second
delay time and a second error value at the extreme point of the
error function; if the first difference between the second
delay time and a threshold
delay time of any of the first delay times is greater than or equal to a first threshold, or the second difference between the second error value and the first error value is greater than or equal to a second threshold, then the second delay time is used to replace one of the edge delay times in the current first delay time. All the above steps are repeated until the first difference is less than the first threshold and the second difference is less than the second threshold, and this second delay time is determined as the minimum delay time between the two seismic traces. This invention improves the calculation speed for calculating the minimum delay time between two seismic traces.