Abstract: The near-surface survey and static correction are the key tasks of seismic data processing for mountain landform, varied low-velocity zone and thickness as well as relief top interface of high-velocity layer in southern margin of Junggar basin. The basic principles, applicable conditions and merit and demerit of several conventional methods for surface structure survey are analyzed. In light of extremely varied landform and low-velocity zone thickness in the studied area, joint survey of surface geological structures is proposed and adopted. On the basis of extended generalized reciprocal method (EGR4), integrated with mini-refraction, differential log and ! values, the method for near-surface structural models is developed, and taking 3D seismic of Tugulu mountain area an example, the effectiveness of the composite modeling is indicated.

Key words: Junggar basin, seismic refraction, static correction, low-velocity zone, 3D, model