Method and system for surface-consistent phase and time lag correction of seismic data
US5764516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1995 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Dec 29, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/53
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A computer system and method for correcting seismic data for phase distortion due to the effects of the near-surface layer are disclosed. Phase error corrections are performed on multiple frequency bands, beginning with a primary band and then proceeding with adjacent frequency bands. The primary band phase constant and time lag corrections are derived in a manner in which the phase correction is applied to the correlation function prior to selection of the peak time lag value, improving the accuracy of the time lag decomposition. Corrections for the secondary bands are made in such a way that the phase corrections at a tie frequency within the overlap frequencies between each secondary band and its adjacent bands are forced to be equal. At each step, surface-consistent decomposition of the phase static components and the time lag static components is performed using a weighted least-squares approach. An alternative embodiment performs the method by determining total corrections in each band to minimize the data storage requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.