Patent ID: 9645270
Date: 2017-05-09
CPC Classifications: G01V

Claim:
1. A method for mitigating coherent noise in seismic data, comprising: (a) obtaining seismic data; (b) identifying from the seismic data a dominant direction representing orientation of subsurface strata using structure tensor analysis, wherein a dominant eigenvalue of the structure tensor determines a strata orientation vector; (c) adaptively subtracting data corresponding to the dominant direction from the seismic data using a convolution matrix, wherein the adaptive subtraction is performed by filtering the seismic data with a convolution kernel, said convolution kernel having weights adaptively determined from estimates of structure dips in an image of the seismic data; (d) subtracting local average seismic amplitude from data resulting from (c), to generate an estimate of noise, wherein the local average seismic amplitude is an average of all data within a window of the convolution kernel; and (e) subtracting the estimated noise from the obtained seismic data; wherein the steps (c), (d), and (e) are performed using a computer.