Patent ID: 8958266
Filing Date: 2015-02-17
Classification: G01V

Abstract:
1. A method of obtaining seismic signals representative of properties of the earth's interior, including the steps of obtaining near-field acoustic signals recorded in the vicinity of a seismic source, wherein the near-field acoustic signals comprise a combination of signals generated by seismic source and seismic signals generated by reflections of the signals generated by the seismic source from a sea bed and sub-surface structures; muting at least partly signals representing direct arrivals from the seismic source; identifying a zero-offset data set in the obtained near-field acoustic signals, wherein the zero offset data set comprises a remaining part of the obtained near-field acoustic signals after the direct arrivals are removed from the near-field acoustic signals; and using the zero-offset data set for at least one of extrapolating data sets from other locations and interpolating data between the zero-offset data set and non-zero-offset data sets.