Method and apparatus for correcting effects of ship motion in marine seismology measurements

A method for correcting marine seismic data for distortion caused by the motion of a seismic source, comprising:

• separating said seismic data into portions, each portion corresponding to a range of dip angles, wherein said step of separating said seismic data into portions includes:
• computing a transform of said seismic data to produce transformed data;
• selecting a subset of said transformed data;
• and
• computing an inverse transform of said subset;
• computing Doppler correction filters for said portions;
• and
• applying said Doppler correction filters to said portions.

A seismic system, comprising:

• a seismic measurement and processing system;
• a user input device coupled to said seismic measurement and processing system;
• a display device coupled to said seismic measurement and processing system;
• wherein said seismic measurement and processing system includes a processing unit and a storage unit, and said seismic measurement and processing system corrects seismic data for source motion by computing an F-K transform of said seismic data, computing an inverse F-K transform of a constant dip slice of said F-K transformed data, and applying appropriate correction filters to each inverse-transformed constant dip slice of F-K transformed data.

A seismic system, comprising:

• a seismic measurement and processing system;
• at least one seismic source coupled to said seismic measurement and processing system;
• at least one seismic receiver coupled to said seismic measurement and processing system;
• a user input device coupled to said seismic measurement and processing system;
• and
• a display device coupled to said seismic measurement and processing system;
• wherein said seismic measurement and processing system includes a source and receiver interface unit, a processing unit, and a storage unit, and said seismic measurement and processing system corrects for source motion by computing an F-K transform of seismic data detected by said receivers, computing an inverse F-K transform of a constant dip slice of said F-K transformed data, and applying appropriate correction filters to each inverse-transformed constant dip slice of F-K transformed data.