Summary

A new method for 3-D refracted arrivals statics is developed, the main idea of which is to carry out a common midpoint sorting of picked first arrival times. The observation surface is divided into CMP bins. After CMP sorting, the delay time in low frequency and refractor velocity at each CMP position are estimated by least mean-squares fitting of a straight line equation for the corresponding CMP traveltime curve. The delay time at each source or receiver position is determined by bilinear interpolation using the time at the adjacent CMP positions, which is equivalent to long wavelength statics. These times at source and receiver positions and the traveltime along the corresponding refractor between them are removed from original first arrival times, and the residual times with high frequency disturbance are obtained.

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