Abstract

The present work deals with the study of the effect of sea level changes due to tides on the processing of 3D offshore seismic data acquired over south Heera field. The water column variations due to high/low tides result in raising/lowering the source and receiver positions from the reference datum (MSL).The variations in the water column are of the order of 0-5 m. This introduces time shifts in the travel path in the data recorded during high and low tides with respect to reference datum. To account for these time shifts, tidal corrections were derived with the help of tidal chart and water column velocity and were applied to the data .The correction, though small in magnitude (approx. 7ms), has considerably improved the resolution, standout and continuity of events.