Method for compensating for the effect of irregular spatial sampling of seismic wavefields
AssigneeWestern Atlas International, Inc.
InventorsCraig J. Beasley, Rolf Klotz
Life of this patent
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Abstract
This invention provides a method for compensating for the deleterious effects of irregular spatial sampling of seismic data. The imbalance caused by sparse sampling is corrected by decomposing a processed data gather into its constituent dip and azimuth components, analyzing the movement and scaling of selected attributes of those components and applying an inverse sampling operator to the processed data based upon the analytical results.
Claims7
A method for processing seismic wavefields propagated from a source location, comprising:
- spatially sampling said wavefield at a preselected plurality of discrete sampling stations distributed over an area remotely from said source location;
- combining the wavefield samples into a raw wavefield input gather;
- applying a selected processing operator to said raw wavefield input gather to provide a processed gather;
- applying an inverse sampling operator to said processed gather, the inverse sampling operator including the steps of:
- (a) decomposing the processed gather into constituent dip components;
- (b) tabulating the number of live dip components;
- (c) scaling selected attributes of said constituent dip components by dividing the constituent dip components by the number of live dip components to provide equalized dip components;
- and
- (d) correcting said equalized dip components to suppress undesired processing artifacts resulting from locally relatively sparse and locally relatively dense spatial sampling.
A method for compensating for the effect of irregular spatial sampling intervals in a multichannel seismic survey, comprising:
- propagating a seismic wavefield from a source location;
- spatially sampling said wavefield at a preselected plurality of discrete sampling stations distributed over an area remotely from said source location;
- combining the wavefield samples in a raw wavefield gather;
- computing a sampling operator;
- applying an inverse sampling operator to said raw wavefield gather to produce an equalized wavefield gather;
- applying a selected processing operator to said equalized wavefield gather to provide a processed gather;
- and
- displaying said processed gather.
Dependencies are inferred from the claim text.