Patent ID: 8964505
Filing Date: 2015-02-24
Classification: G01V

Abstract:
1. A method for calculating an offset shift of measured offsets between a seismic source and plural receivers of a streamer, the method comprising: towing with a vessel at least the streamer and the seismic source in water, wherein the plural receivers include a first receiver and a second receiver; actuating the seismic source to generate energy; recording plural traces with the receivers, wherein the traces represent energy reflected from a subsurface under the water; 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 wherein quantity X has units of seconds squared per meter, 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; and estimating the offset shift from b to correct the measured offsets.