Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1986-03-14
1989-02-28
Steinberger, Brian S.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 45, G01V 100
Patent
active
048092380
ABSTRACT:
A method for restoring to filtered seismic data at least some of the ramdom background noise associated with the data in its form prior to filtering. The method includes the steps of filtering seismic data in a two-dimensional filter; generating a noise signal representing the random background noise associated with the data; filtering the noise signal in an inverse filter corresponding to the two-dimensional filter; and adding the inverse-filtered first signal to the filtered seismic data. In one embodiment, the noise signal is generated by filtering a copy of the data in a least-mean-squares adaptive filter to remove substantially all coherent energy therefrom. In another embodiment, the noise signal is an independently generated white noise signal having beginning and end times matching those of the seismic data. This white noise signal is the bandpass filtered to cause its frequency content to match that of the seismic data. Examples of two-dimensional filters that may be employed include a dip filter, an effective filter associated with migration, or a filter used in running mix operations. Data processed in accordance with the invention have a completely filtered coherent portion and a restored background noise portion, so that the processed data, when displayed, exhibit greater reflector continuity, more accurate amplitude relationships, and better cosmetic acceptability.
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Bishop Glen W.
Hornbostel Scott C.
Bell Keith A.
Equitz Alfred A.
Exxon Production Research Company
Steinberger Brian S.
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