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US 7,584,057 B2Granted
Seismic acquisition and filtering
AssigneeWesternGeco L.L.C.
InventorsAli Özbek, Leila Hoteit
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Abstract
An iterative process is described for obtaining a finite impulse filter to remove noise from seismic data through an iterative process with constraints on the filter applied in both, the original space-time and the transform frequency wave number at each iteration step.
Claims13
A method of using a digital filter for seismic signals comprising the steps of:
- receiving seismic data;
- determining the digital filter by:
- defining constraints representing a filter for preserving signals representing reflection and/or refractions from sub-surface structure and suppressing noise signals in seismic signals;
- and
- using an iterative process with each iteration further comprising the steps of:
- transforming a filter obtained from a previous iteration into a transform domain;
- applying in said transform domain first constraints;
- inverse transforming the filter with the applied constraints into a sample domain;
- and
- applying in said sample domain second constraints to obtain an iterated filter;
- and
- using the digital filter to remove noise from the seismic data.
9 more elements
Dependencies are inferred from the claim text.