US 2013/0155813 A1 · ITERATIVE DIP-STEERING MEDIAN FILTER FOR SEISMIC DATA PROCESSING

Abstract

An iterative dip-steering median filter is provided for random noise attenuation in seismic data where conflicting dips are indicated in the data. A number of dominant dips inside a processing window or sample of the data are identified by a Fourier-radial transform in the frequency-wavenumber domain. A median filter is then applied along the dominant dip to remove noise, and the remaining signal after filtering is retained for further median filter iterations. Iterations are repeated to apply the median filter along the most dominant dip in the remaining data. The processing continues in subsequent iterations until all selected dips have been processed. The remaining signal of each iteration is then summed for final output.

Claims20

Dependent claims

A computer implemented method of processing seismic data, in which time-spatial processing results of the data indicate conflicting dips, to attenuate random noise in the seismic data, comprising the computer implemented processing steps of:

(a) assembling the time-spatial processing results of seismic data in the computer to form a series of overlapping time-spatial sample windows of the seismic data;
(b) transforming the data of an individual one of the sample windows of seismic data into frequency-wavenumber domain data;
(c) transforming the frequency-wavenumber domain data of the sample window data into Fourier-radial domain data;
(d) determining a map of peak values of the Fourier-radial domain data of the sample window;
(e) transforming selected ones of the peak values of the Fourier-radial domain data of the sample window to indicate dominant dips in the sample window data;
(f) applying a median filter to the data in the sample window along a selected one of the indicated dominant dips to attenuate noise from the data in the sample window;
and
(g) storing the remaining signal in the median filtered data for the sample window.

5 more elements

A data processing system for seismic data, in which time-spatial processing results of the data indicate conflicting dips, to attenuate random noise in the seismic data, the data processing system comprising:

a data storage memory storing the time-spatial processing results of the seismic data;
a processor for performing the steps of:
(a) assembling the time-spatial processing results of seismic data in the computer to form a series of overlapping time-spatial sample windows of the seismic data;
(b) transforming the data of an individual one of the sample windows of seismic data into frequency-wavenumber domain data;
(c) transforming the frequency-wavenumber domain data of the sample window data into Fourier-radial domain data;
(d) determining a map of peak values of the Fourier-radial domain data of the sample window;
(e) transforming selected ones of the peak values of the Fourier-radial domain data of the sample window to indicate dominant dips in the sample window data;
(f) applying a median filter to the data in the sample window along the indicated dominant dips to attenuate noise from the data in the sample window;
and
(g) storing the remaining signal of the median filtered data output for the sample window.

7 more elements

A data storage device having stored in a computer readable medium computer operable instructions for causing a data processing system to process seismic data, in which time-spatial processing results of the data indicate conflicting dips, to attenuate random noise in the seismic data, the instructions stored in the data storage device causing the data processing system to perform the following steps:

(a) assembling the time-spatial processing results of seismic data in the computer to form a series of overlapping time-spatial sample windows of the seismic data;
(b) transforming the data of an individual one of the sample windows of seismic data into frequency-wavenumber domain data;
(c) transforming the frequency-wavenumber domain data of the sample window data into Fourier-radial domain data;
(d) determining a map of peak values of the Fourier-radial domain data of the sample window;
(e) transforming selected ones of the peak values of the Fourier-radial domain data of the sample window to indicate dominant dips in the sample window data;
(f) applying a median filter to the data in the sample window along the indicated dominant dips to attenuate noise from the data in the sample window;
and
(g) storing the remaining signal of the median filtered data output.

5 more elements

Dependencies are inferred from the claim text.

Iterative dip-steering median filter for seismic data processing

Life of this patent

Iterative dip-steering median filter for seismic data processing

Life of this patent

Abstract

Claims20