Seismic static corrections in irregular or steeply dipping water-bottom environments

Abstract

Fictitious time shifts with consequent time and velocity errors are introduced when conventional replacement static corrections are used on marine seismic data, recorded over irregular or steeply dipping water-bottom environments. Correct common depth point (CDP) stacking of seismic reflection signals involves the determination of appropriate time-variant static corrections for different receiver geophone positions. Static corrections are shown to depart from surface consistency over irregular water-bottom environments. To study these problems, raypath modelling has been carried out for two irregular water-bottom situations which are typically complex. A technique is illustrated for determining static corrections in such areas.