Abstract：3D refraction static corrections technique is a complete set of techniques,which is concerned with such steps as pickup of first breaks of refractions on seismic records,strata partitioning of refrac-tors,analyzing refraction velocity,computation of time delay,building up near-surface model and computing datum statics.In order to improving the final effects of static corrections,strict QC for above-mentioned links is needed.It should ensure that the times of first breaks of most traces are correct while picking up times of refracted first breaks,that can ensure the subsequent processing to meet the demand.Because the times of refracted first breaks on the seismic records are characteris-tics of continuity and high folds,increasing statisti-cal effects,the near-surface models building up therefor are more practical and computed statics are more correct.3D refraction static corrections are suitable for such complex surface conditions as mountains,transient zones,loess plateaus,hills,which have more severe static corrections problem.
