Method for sub-salt migration velocity analysis
AssigneePGS Geophysical AS
InventorsJunru Jiao, David Richard Lowrey, John Frier Willis, Daniel Solano
Life of this patent
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Abstract
A method for interpreting seismic data below a salt layer includes depth migrating the seismic data to a bottom of the salt layer. The migrating including generating an initial model of velocities below the salt layer. The initial model is scaled by a plurality of scale factors at at least one image position. At least one of the plurality of scale factors for which a depth migrated image below the salt layer is optimum is selected as the scale factor.
Claims15
A method for generating an image of subsurface formations below a salt layer from seismic data acquired therefrom, the seismic data representing signals acquired by deploying a seismic energy source and seismic sensors, actuating the source and detecting seismic energy resulting therefrom at the sensors, comprising:
- depth migrating the seismic data to a bottom of the salt layer, the migrating including generating an initial model of velocities below the salt layer;
- scaling the initial model by a plurality of scale factors at at least one image position;
- and
- selecting at least one of the plurality of scale factors for which a depth migrated image below the salt layer is optimum to generate an optimized image at the at least one image position.
A method for generating an image of subsurface formations below a salt layer from seismic data acquired therefrom, comprising:
- depth migrating the seismic data to a bottom of the salt layer, the migrating including generating an initial model of velocities below the salt layer, the seismic data representing signals acquired by deploying a seismic energy source and seismic sensors, actuating the source and detecting seismic energy resulting therefrom at the sensors;
- scaling the initial model by a plurality of scale factors at at least one image position;
- selecting at least one of the plurality of scale factors for which a depth migrated image below the salt layer is optimum;
- selecting a plurality of image positions proximate to the at least one image position;
- generating a visual display of images for the plurality of image position and the at least one image position;
- and
- determining the optimum image wherein a visual appearance of the images is sharpest.
Dependencies are inferred from the claim text.