Method for enhancing the resolution of a seismic image
AssigneeTotal SA
InventorPierre Hardy
Life of this patent
Estimating the term…
Abstract
A method for enhancing a physical parameter map in a zone of a seismic image. The dip of points of the image is obtained. For one of these points, called second point, a correction factor of a physical parameter is obtained with a residual move-out algorithm from a common image gather. A first point is selected on a line substantially perpendicular to the dip at the second point. The selection involves at least one parameter among whether the difference between the dip at the second point and the dip at the first point is below a first preset value; and the spacing between the first and the second point is below a second preset value. An inversion algorithm gives a corrected interval value of the physical parameter to update the physical parameter map.
Claims14
A method for creating an enhanced physical parameter map of a zone of a seismic image, the seismic image formed using a plurality of seismic waves and the application of seismic tomography, said method comprising:
- /a/ obtaining the zone of the seismic image, said zone comprising a set of points;
- /b/ obtaining a dip at each point in the set of points;
- /c/ selecting at least a first point in the set of points, and a second point in the set of points, said selection being based on at least one parameter among:
- a difference between a dip at said second point and a dip at the first point is below a first preset value;
- and
- a spacing between the first point and the second point is below a second preset value;
- /d/ obtaining a common image gather associated with the second point in said set of points;
- /e/ applying a residual move-out analysis algorithm to the common image gather to obtain a correction factor of a physical parameter at said second point;
- /f/ applying an inversion algorithm to points between the first point and the second point in the set of points and along a line joining said first point and second point, to obtain an interval value of said physical parameter to update the physical parameter map,
- /g/ outputting the interval value of said physical parameter and updating the physical parameter map;
- and
- /h/ displaying a seismic image containing the enhanced physical parameter map.
A non-transitory computer readable storage medium, having stored thereon a computer program comprising program instructions, the computer program being loadable into a data-processing unit and adapted to cause the data-processing unit to carry out a method for enhancing a physical parameter map in a zone of a seismic image, the seismic image formed using a plurality of seismic waves and the application of seismic tomography said method comprising:
- /a/ obtaining the zone of the seismic image, said zone comprising a set of points;
- /b/ obtaining a dip at each point in the set of points;
- /c/ selecting at least a first point in the set of points, and a second point in the set of points, said selection being based on at least one parameter among:
- a difference between a dip at said second point and a dip at the first point is below a first preset value;
- and
- a spacing between the first point and the second point is below a second preset value;
- /d/ obtaining a common image gather associated with the second point in said set of points;
- /e/ applying a residual move-out analysis algorithm to the common image gather to obtain a correction factor of a physical parameter at said second point;
- /f/ applying an inversion algorithm to points between the first point and the second point in the set of points and along a line joining said first point and second point, to obtain an interval value of said physical parameter to update the physical parameter map, and
- /g/ displaying a seismic image containing the enhanced physical parameter map
- when the computer program is run by the data-processing unit.
Dependencies are inferred from the claim text.