Generating pseudo pressure wavefields utilizing a warping attribute
AssigneePGS Geophysical AS
InventorsJulien Oukili, Bagher Farmani
Life of this patent
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Abstract
Techniques are disclosed relating to the determination of a warping attribute related to a difference between an up-going pressure wavefield and a down-going pressure wavefield received from a seismic data acquisition system. The warping attribute is used to determine a pseudo up-going or down-going pressure wavefield. The pseudo pressure wavefield is used to generate a modified record of geophysical data, which is stored in a non-transitory memory medium as a geophysical data product.
Claims21
A method of manufacturing a geophysical data product, the method comprising:
- accessing a representation of an up-going pressure wavefield and a down-going pressure wavefield;
- determining a warping attribute based at least in part on a difference between the up-going pressure wavefield and the down-going pressure wavefield;
- determining a pseudo down-going pressure wavefield based on the up-going pressure wavefield and the warping attribute;
- and
- using the pseudo down-going pressure wavefield to generate a modified record of geophysical data, wherein the warping attribute enables the pseudo down-going pressure wavefield to be generated from the up-going pressure wavefield without persistently storing a record of the down-going pressure wavefield, thereby reducing computational resources required to generate the modified record of geophysical data;
- and
- storing the modified record of geophysical data on a non-transitory computer readable memory medium, thereby completing the manufacture of the geophysical data product.
A computer system configured to generate a noise-reduced image of subsurface geology from seismic data, the computer system comprising:
- one or more processors;
- a non-transitory computer readable memory medium;
- wherein the one or more processors are configured to execute instructions stored on the non-transitory computer readable memory medium to implement:
- means for receiving an up-going pressure wavefield and a down-going pressure wavefield, wherein the pressure wavefields comprise seismic data received from a seismic data acquisition system located beneath a free-surface of a body of water;
- means for determining a warping attribute based at least in part on a difference between the up-going pressure wavefield and the down-going pressure wavefield;
- means for determining a pseudo down-going pressure wavefield based on the up-going pressure wavefield and the warping attribute;
- generation of a modified record of geophysical data using the pseudo down-going pressure wavefield;
- and
- storage of a modified record of geophysical data on a non-transitory computer readable memory medium, thereby generating the noise-reduced image of subsurface geology.
A non-transitory computer-readable memory medium storing program instructions which, when executed by a processor of a computer system, cause the computer system to at least:
- access a representation of a down-going pressure wavefield and an up-going pressure wavefield;
- determine a warping attribute based at least in part on a difference between the down-going pressure wavefield and the up-going pressure wavefield;
- determine a pseudo up-going pressure wavefield based on the down-going pressure wavefield and the warping attribute;
- use the pseudo up-going pressure wavefield to generate a modified record of geophysical data;
- and
- store the modified record of geophysical data on the non-transitory computer-readable memory medium.
Dependencies are inferred from the claim text.