Methods of enhancing separation of primary reflection...

Details Methods of enhancing separation of primary reflection... Methods of enhancing separation of primary reflection...

2009-06-22

2010-10-26

Hellner, Mark (Department: 3663)

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

C367S043000, C367S046000, C367S047000, C367S049000

Reexamination Certificate

active

07821869

ABSTRACT:
Improved methods of processing seismic data which comprise amplitude data assembled in the offset-time domain in which primary reflection signals and noise overlap are provided for. The methods include the step of enhancing the separation between primary reflection signals and coherent noise by transforming the assembled data from the offset-time domain to the time-slowness domain. More specifically, the assembled amplitude data are transformed from the offset-time domain to the time-slowness domain using a Radon transformation according to an index j of the slowness set and a sampling variable Δp; whereinj=pmax-pmin+1⁢⁢µ⁢⁢sec⁢/⁢mΔ⁢⁢p,Δp is from about 0.5 to about 4.0 μsec/m, pmaxis a predetermined maximum slowness, and pminis a predetermined minimum slowness. Alternately, an offset weighting factor xnis applied to the assembled amplitude data, wherein 0<n<1, and the amplitude data are transformed with a Radon transformation. The assembled amplitude data also may be transformed with a Radon transformation applied within defined slowness limits pminand pmax, where pminis a predetermined minimum slowness and pmaxis a predetermined maximum slowness, with a hyperbolic Radon transformation, or, as applied to data which have been uncorrected for normal moveout, with a hyperbolic or parabolic Radon transformation. Thus, the primary reflection signals and coherent noise transform into different regions of the time-slowness domain to enhance the separation therebetween.

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