Abstract

Seismic data imaging quality mainly depends on the Seismic signal energy that reaches the exploration target layer after penetrating overlying formations and returning to the surface. The strong impedance interface of the overlying formations has a screening effect on the transmission of the wave field, thus weakening the reflection signal energy from the target reservoir. As a result, in such areas it becomes very difficult with very poor seismic imaging quality. To solve such problems, preservation of low-frequency signals in the acquisition as well as in the processing of seismic data is important as the low-frequency signal has a stronger capability against absorption and scattering. In normal processing sequence we use all frequencies during migration but if we restrict our frequencies during migration itself, the results are different.