DEVICE AND METHOD FOR DETERMINING SEISMIC OFFSET IN MARINE ACQUISITION

Computing device and method for generating an image of a subsurface. The method calculates an offset shift of measured offsets between a seismic source and plural receivers of a streamer. The method includes receiving seismic data recorded underwater by the plural receivers; selecting two pairs of traces from the plural traces and for each pair, calculating a quantity Y that depends on measured offsets of receivers for which the traces were selected, and a quantity X that depends on travel-times and the measured offsets of the receivers for which the traces were selected; calculating a linear relation Y=aX+b, where "a" is a constant and "b" is related to the offset shift; estimating the offset shift from "b"; correcting the measured offsets of the receivers based on the offset shift; and calculating the image of the subsurface based on the corrected offsets.