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US 11,977,198 B2Granted
Isofrequency volumes ratio workflow to detect gas reservoirs in 3D domain
AssigneeSaudi Arabian Oil Company
InventorsHassan A. AlDubaisi, Taher M. Sodagar
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Abstract
A method that includes transforming a relative amplitude preserved 3D seismic volume acquired in the time-domain into a plurality of isofrequency volumes, extracting from the plurality of isofrequency volumes a first isofrequency spectral amplitude volume and a second isofrequency spectral amplitude volume. The method further includes determining an attribute volume from the two isofrequency spectral amplitude volumes, and determining a presence of gas in a subterranean region of interest based on the attribute volume.
Claims14
A method, comprising:
- transforming, by a seismic processor, a relative amplitude preserved 3D seismic volume acquired in a time-domain into a plurality of isofrequency volumes;
- extracting, by the seismic processor, from the plurality of isofrequency volumes, a first isofrequency spectral amplitude volume and a second isofrequency spectral amplitude volume;
- determining, by the seismic processor, an attribute volume from the first isofrequency spectral amplitude volume and the second isofrequency spectral amplitude volume by determining a product of a value of at least one voxel in the first isofrequency spectral amplitude volume and a value of at least one voxel in the second isofrequency spectral amplitude volume;
- determining, by the seismic processor, a location of gas in a subterranean region of interest based on the attribute volume;
- and
- drilling a wellbore to the location of gas using a drilling system.
3 more elements
A system, comprising:
- a seismic processor capable of executing instructions stored in a computer-readable medium that cause the seismic processor to perform functions comprising:
- transforming a relative amplitude preserved 3D seismic volume acquired in a time-domain into a plurality of isofrequency volumes,
- extracting, from the plurality of isofrequency volumes, a first isofrequency spectral amplitude volume and a second isofrequency spectral amplitude volume,
- determining an attribute volume from the first isofrequency spectral amplitude volume and the second isofrequency spectral amplitude volume by determining a product of a value of at least one voxel in the first isofrequency spectral amplitude volume and a value of at least one voxel in the second isofrequency spectral amplitude volume, and
- determining a location of gas in a subterranean region of interest based on the attribute volume;
- and
- a drilling system for drilling a wellbore to the location of gas.
4 more elements
Dependencies are inferred from the claim text.