Device and method for processing variable depth streamer data
AssigneeCggveritas Services SA
InventorGordon Poole
Life of this patent
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Abstract
Computing device, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method includes receiving seismic data recorded by seismic receivers that are towed by a vessel, wherein the seismic data is recorded in a time-space domain; modeling the seismic data in a shot or common midpoint domain as a function of operators to derive a model; using the derived model to remove the receiver ghost from the seismic data to obtain deghosted seismic data; and generating a final image of the subsurface based on the deghosted seismic data.
Claims29
A method for separating primaries from ghosts of seismic data related to a subsurface of a body of water, the method comprising:
- receiving seismic data recorded by seismic receivers, wherein the seismic data is recorded in a time-space domain and the seismic receivers are located in the body of water;
- deriving a model domain describing the seismic data, the model domain being determined based on a function of a first operator representative of receiver ghost energy and a second operator representative of primary energy, wherein the first operator introduces sea-surface ghost energy by multiplying the first operator with a reflection coefficient at the sea-surface, and, in addition, the first and second operators reverse transform the model domain to obtain a representation of the seismic data, and the model domain is a domain other than the time-space domain;
- using the derived model domain to separate primary from ghost energy by applying a third operator to the derived model domain;
- and
- generating a final image of the subsurface based on the separated primary or ghost energy.
A method for processing receiver seismic data related to a subsurface of a body of water, the method comprising:
- receiving seismic data recorded by seismic receivers, wherein the seismic data is recorded in a time-space domain and the seismic data has already been processed to remove a receiver ghost;
- deriving a model domain describing the processed seismic data in a shot or common midpoint domain as a function of operators that include a first operator representative of primaries;
- applying a second operator to the derived model domain to generate a ghost dataset;
- using the ghost dataset to re-ghost the processed seismic data to obtain reghosted seismic data, wherein re-ghosting introduces sea-surface ghost energy by multiplying the first operator with a reflection coefficient at the sea-surface;
- and
- generating a final image of the subsurface based on the reghosted seismic data.
Dependencies are inferred from the claim text.