Patent ID: 7447114
Filing Date: 2008-11-04
Classification: G01V

Abstract:
1. A method of filtering seismic data, the method comprising: calculating, from an input seismic trace comprising negative and positive samples, a nonlinear compression trace using a plurality of the positive samples from the input seismic trace; calculating a nonlinear rarefaction trace using a plurality of the negative samples from the input seismic trace; and deriving a multi-component matching filter to fit a plurality of samples from the input seismic trace, nonlinear compression trace, and nonlinear rarefaction trace to a reference trace, wherein calculating a nonlinear compression trace using a plurality of the positive samples from the input seismic trace comprises selecting the positive samples S wherein calculating a nonlinear rarefaction trace using a plurality of the negative samples from the input seismic trace comprises selecting the negative samples S wherein deriving a multi-component matching filter comprises minimizing the function wherein the multi-component matching filter comprises an adjusted normal trace filter F 1 , a compression filter F 2 , and a rarefaction filter F 3 .