Cross trace coherent noise filtering for seismograms
AssigneeMobil Oil Corporation
InventorJames N. Galbraith, Jr.
Life of this patent
Estimating the term…
Abstract
In seismic exploration windows from a pair of contiguous traces are used in a process which determines the coherent noise on a basis trace and removes this coherent noise from a prediction trace. The operator of a digital filter is determined by autocorrelating the basis trace, cross-correlating the window of the basis trace, with the window of the prediction trace, and selecting the filter operator which produces the least error between the cross-correlation function and the product of the autocorrelation function and the operator.
Claims3
In seismic exploration wherein sets of seismic traces represent the reflections of seismic energy detected at locations along a line of exploration, the method of filtering coherent noise which has a different moveout from trace to trace than said reflections comprising:
- selecting sampling windows from a pair of contiguous traces in said set, one being a basis trace and the other a prediction trace;
- determining the coefficients of a digital filter which correlates the coherent noise in the window of said basis trace with the coherent noise in the window of said prediction trace;
- filtering said basis trace with said digital filter to produce an estimate of said coherent noise;
- removing said estimate of said coherent noise from said prediction trace;
- and
- repeating all of the foregoing steps for other pairs of contiguous traces in said set to remove said coherent noise from said traces.
Dependencies are inferred from the claim text.