Reverse-time migration imaging conditions based on Poynting vector and directional one-way wave field separating

Pre-stack reverse-time migration shows great superiority in dealing with steep dip angle structures and complex velocity models,but the low frequency noise seriously affects the quality of imaging. The reflect angle can be calculated by the Poynting vector,the direction of which indicates that of the propagation of seismic wave, and meanwhile seismic wave field can be separated into up-going one and down-going one.This paper proposes a new imaging condition,by using which the imaging noise caused by the cross-correlation of the up-going wavefield and the down-going one in the same direction,as well as wide angle noise can be well suppressed. Compared with the conventional crosscorrelation imaging conditions,the new imaging condition is easy to realize,the extra calculation and storage are both very small.The new imaging condition is applied in Marmousi model and the migration results shows that the low frequency noise is well suppressed.