适用于煤田的变速DMO方法

Variable velocity DMO for coal exploration

In coal cxploration seismic velocities are often found to be vertically and laterally varied in so much that a processing called variabIe velocity DMO is in demand. In this paper Gardner's DMo is introduced which is supposed to be the best option to deal with the problem of ve locity variation due to its straightfoward properties and thc applicability to structurally-complexed areas with strata in steep dips. T his partial prestack migration technique is implemented in two steps:they are the DMO processing itself and a standard NMO processing which are independent of velocity and dip,respectively.