Abstract：The buried-hill reservoir is an important type of reservoir in Shengli Oilfield,which has characters of abundant reservoir,many strata and high production capacity.Because the buried-hill strata have experienced structural movement in different geologic period.the faults cut and intersected together which resulted in very complicated internal structure;meanwhile,the structures bury deeply,all these make ordinary seismic section can't correctly image the buried-hill strata.The difficulty of farmer buried－hill reservoir prospecting is determination of structore.The prestack depth migration by Kirchboff integration is an imaging technique just develaped far this situation.Following Snell rule of wave propagation and by the aid of the technique salving directly eikonal equation for calculating 3-D travel－time by up-wind finite-difference method,the method can solve the imaging problem in complicated buried－hill strata.Application the method in Cudau area shows a good result.
