Method of attenuating noise in three dimensional seismic data using a projection filter
US6668228B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2001 |
| Grant date | Dec 23, 2003 |
| Priority date | — |
| Expiry date | Oct 9, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/3246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of attenuating noise in three dimensional seismic data using a projection algorithm is disclosed. A frequency—space—space (“f-xy”) projection algorithm is used which is a generalization of the f-x projection algorithm. The predictability of the seismic signals in the f-xy domain constitutes the basis of the algorithm. Specifically it is demonstrated that if the seismic events are planar in the t-xy domain, then in the f-xy domain they consist of predictable signals in the xy-plane for each frequency f. A crucial step of the 2-D spectral factorization is achieved through the helical coordinate transformation. In addition to the disclosed general algorithm for arbitrary coherent noise, a specialized algorithm for random noise is disclosed. It has been found that the disclosed projection algorithm is effective even in extreme cases of poor signal to noise ratio. The algorithm is also signal preserving when the predictability assumptions hold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.