Seismic data processing systems and methods
US6778909B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2003 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Mar 31, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/57
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In one embodiment, a computer-implemented common azimuth migration seismic data processing method comprises: providing a common-azimuth input data set for a geophysical data processing volume of interest; providing a velocity model for the volume; applying an offset antialiasing operator to the input data set; and performing a recursive downward-continuation of the common-azimuth input data set to a plurality of successive common-azimuth surfaces to generate an image of the volume of interest. In one embodiment, the present invention further provides for selecting a depth dependence of an offset range employed in the downward continuation; selecting a frequency-dependence of a depth step size employed in the downward continuation; selecting a frequency dependence of a cutoff depth employed in the downward continuation; and adding reciprocal traces to the data around zero offset, for reducing imaging artifacts introduced by data edge effects. Similar methods can be applied with a narrow-azimuth downward continuation operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.