System and method for three-dimensional iterative filtering of scattered waves in cross spread seismic systems
AssigneeCgg Services SAS
InventorsBenoit De Cacqueray, Philippe Roux
Life of this patent
Estimating the term…
Abstract
A system and method are provided for filtering scatterer noise energy from land seismic waves using three dimensional (3D) iterative filtering in a cross-spread source-receiver pattern. The system and method isolate scatterer noise energy associated with a scatterer based on a filtering process performed using a scatterer referential time delay. Then, the isolated scatterer noise energy can be subtracted from the surface wave data. This process can be repeated for each scatterer in the covered area to remove each of their contributions, and can be performed, for example, after a preliminary filtering of the surface wave data using 3D fk filtering or the like.
Claims18
A method for filtering scatterer noise energy from land seismic waves in a cross-spread source-receiver pattern, the method comprising:
- recording waves received at receivers disposed relative to a shot pattern in a cross-spread source receiver pattern;
- filtering surface waves from the recorded waves to produce surface wave filtered data;
- determining a plurality of scatterers associated with the recorded waves;
- selecting a scatterer from the plurality of scatterers;
- isolating scatterer noise energy generated by the scatterer by filtering the surface wave filtered data using a scatterer referential time delay associated with the scatterer, wherein the scatterer referential time delay is calculated as
- TRD=(ddr,2B+dsd,2B−ddr,2A−dsd,2A)/vSM, wherein
- ddr,B is a first distance from said selected scatterer to a first selected receiver,
- dsd,B is a second distance from said selected scatterer to a first selected source,
- ddr,A is a third distance from said selected scatter to a second selected receiver, and
- dsd,A is a fourth distance from said selected scatterer to a second selected source;
- subtracting said scatterer noise energy from said surface wave filtered data;
- and
- repeating each of the steps of selecting, isolating and subtracting for each of the plurality of scatterers.
A method for filtering scatterer noise energy from land seismic waves, the method comprising:
- filtering surface waves from acquired land seismic data to produce surface wave filtered data;
- selecting a scatterer from a plurality of scatterers;
- isolating scatterer noise energy from the scatterer based on a filtering in a scatterer referential time delay;
- subtracting said scatterer noise energy from said surface wave filtered;
- and
- repeating each of the steps of selecting, isolating and subtracting for each of the plurality of scatterers.
A method for filtering scatterer noise energy from seismic data, the method comprising:
- selecting a scatterer from a plurality of scatterers;
- determining scatterer noise energy generated by the scatterer in seismic data;
- subtracting said scatterer noise energy from the seismic data;
- filtering the seismic data prior to selecting, determining and subtracting;
- determining a scatterer delay associated with the selected scatterer;
- adding the scatterer delay to the seismic data;
- and
- re-filtering the seismic data to subtract the scatterer noise energy from the seismic data.
Dependencies are inferred from the claim text.