Abstract：The paper presented a new method for 3-D refracted first-break static correction,which indudes following steps:①the surveying plane is divided into many CMP bins and delay-time in low frequency and velocity of refractor at CMP point are calculated according to refraction travel-time equations within each bin;②double linear interpolation for delay-times in low frequency and velocities of refractor at adjacent CMP points is carried out,resulted in delay-times in low frequency are converted to long-wavelength statics;③the corresponding delay-times in low frequency and refracted times subtracted from first-break travel-times leave residual refraction travel-times in high frequency,and similarly,these residual travel-times are decomposed to short wavelength statics at shot points and receiver points;④the resulted long wavelength statics are added to resulted short wavelength statics at each shot point and receiver point resulted in total statics at each shot point and receiver point.The method resulted in good applied effects in 3-D static corrections in desert area.
