Method for sharpening prestack depth migration images by removing residual moveout from common image point gathers before stacking
US5128899A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1991 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Jul 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/52
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for removing residual moveout includes sorting the results of common offset depth migration into common image point gathers. A subset of image point gathers are selected for analysis. Each common image point gather is separated vertically into windows, each of which centers on a strong event. For each window, all the offset traces are summed to produce a brute stack trace to be used as an anchor. All offsets are cross-correlated to the anchor to determine how much each trace window should be shifted to sum most constructively with the anchor. A set of dynamic shifts is produced, which when applied, will remove the residual moveouts and produce a truly flat image for stacking. These shifts vary with depth and offset and can be interpolated between the selected image point gathers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.