Method and system for limited frequency seismic imaging
AssigneeCore Laboratories LP
InventorJ. Bee Bednar
Life of this patent
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Abstract
The method and system of the present inventions provides a new approach for selecting frequencies comprising a minimal or limited frequency data set for imaging leading to an order of magnitude decrease in computation resources. Seismic data are acquired and transformed a frequency domain. The data may be gathered in any manner. A plurality of minimal frequency subsets are formed comprising selected frequencies. The frequencies may be selected so that more frequencies are selected for shallower image positions. The selected frequencies are imaged to form frequency images. The selected frequencies may be individually weighted to assure a full and balanced bandwidth. The frequency images are composited to form an intermediate or final composited migration image.
Claims21
A method for processing seismic data comprising:
- a) acquiring seismic data;
- b) transforming said seismic data to a frequency domain;
- c) forming a plurality of minimal frequency subsets comprising selected frequencies;
- d) imaging said selected frequencies to form frequency images;
- and
- e) compositing said frequency images to form a composited migration image.
A digital computer programmed to utilize seismic data traces obtained over a region of the earth's subsurface to perform a process comprising:
- (a) forming a gather of seismic data traces;
- (b) transforming said seismic data to a frequency domain;
- (c) forming a plurality of minimal frequency subsets comprising selected frequencies;
- (d) imaging said selected frequencies to form frequency images;
- and
- (e) compositing said frequency images to form a composited migration image.
A system for processing seismic data obtained over a region of the earth's subsurface comprising:
- a) acquiring seismic data;
- b) transforming said seismic data to a frequency domain;
- c) forming a plurality of minimal frequency subsets comprising selected frequencies;
- d) imaging said selected frequencies to form frequency images;
- and
- f) compositing said frequency images to form a composited migration image
A method for processing seismic data comprising:
- a) acquiring seismic data;
- b) transforming said seismic data to a frequency domain;
- c) forming a plurality of minimal frequency subsets comprising selected frequencies, said selected frequencies in the range (f0, f1) for the minimal frequency subsets selected according to fn=α(z)−nf0 for n=0 to n=N where
- 26 N = log f 0 - log f 1 log α ( z ) . ;
- d) imaging said selected frequencies to form frequency images;
- and
- e) compositing said frequency images to form a composited migration image.
A digital computer programmed to utilize seismic data traces obtained over a region of the earth's subsurface to perform a process comprising:
- a) forming a gather of seismic data traces;
- b) transforming said seismic data to a frequency domain;
- c) forming a plurality of minimal frequency subsets comprising selected frequencies, said selected frequencies in the range (f0, f1) for the minimal frequency subsets selected according to fn=α(z)−nf0 for n=0 to n=N where
- 28 N = log f 0 - log f 1 log α ( z ) . ;
- d) imaging said selected frequencies to form frequency images;
- and
- e) compositing said frequency images to form a composited migration image.
Dependencies are inferred from the claim text.