Spectral shaping inversion and migration of seismic data
First Claim
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1. A method for generating a geophysical model of a subsurface region based on seismic data, the method comprising:
- receiving seismic data corresponding to a plurality of image points;
applying inversion simultaneously to all data in the seismic data; and
migrating the inverted seismic data;
wherein the inversion and migrating are performed using a computer.
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Abstract
A geophysical model of a subsurface region is generated based on seismic data, e.g., seismic reflection data. Migration and seismic inversion are applied to the seismic data to generate estimates of one or more physical or seismic properties of the subsurface region. Seismic inversion, such as spectral shaping inversion, is applied before or after migrating the seismic data through a variety of techniques that each avoid the amplification of dipping energy while optimizing computational efficiency and/or accuracy.
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Citations
18 Claims
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1. A method for generating a geophysical model of a subsurface region based on seismic data, the method comprising:
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receiving seismic data corresponding to a plurality of image points; applying inversion simultaneously to all data in the seismic data; and migrating the inverted seismic data; wherein the inversion and migrating are performed using a computer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for generating a geophysical model of a subsurface region based on seismic data, the method comprising:
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receiving migrated seismic data corresponding to a plurality of image points; demigrating the seismic data with a migration algorithm and a simple velocity model for the subsurface region; applying spectral shaping inversion simultaneously to all data in the demigrated seismic data; and remigrating the shaped seismic data with the migration algorithm and the simple velocity model for the subsurface region; wherein the demigrating, remigrating, and inversion are performed using a computer. - View Dependent Claims (15)
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16. A method for generating a geophysical model of a subsurface region based on seismic data, the method comprising:
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receiving seismic reflection data; migrating the seismic data; applying a spectral shaping inversion filter to the migrated seismic reflection data; stacking the seismic data; and applying a phase rotation to the stacked seismic data spectrum to generate an estimate of impedance of the subsurface region; wherein at least the migrating, applying a spectral shaping inversion filter, stacking, and applying a phase rotation are performed using a computer. - View Dependent Claims (17)
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18. A method for producing hydrocarbons from a subsurface region, comprising:
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generating a geophysical model of a subsurface region based on seismic data, wherein generating the geophysical model comprises; receiving seismic reflection data; migrating the seismic data; applying a spectral shaping inversion filter to the seismic reflection data; stacking the seismic data; and applying a phase rotation to the stacked seismic data spectrum to generate an estimate of a geophysical property of the subsurface region, wherein the spectral shaping inversion is applied to reduce amplification of dipping energy by at least one of (i) applying the spectral shaping inversion filter prior to migrating the data;
(ii) demigrating migrated data prior to applying the spectral shaping inversion filter and remigrating the inverted data; and
(iii) calculating a multi-dimensional spectral shaping operator and multiplying the multi-dimensional spectral shaping operator with a Fourier transform of the migrated data;drilling a well to a formation interpreted in the generated geophysical model as potentially hydrocarbon bearing; and producing hydrocarbons from the well.
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Specification