Noise filtering of seismit data

Patent metadata

Field	Value
Publication number	US-8965706-B2
Application number	US-201013499642-A
Country	US
Kind code	B2
Filing date	Sep 20, 2010
Priority date	Oct 12, 2009
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

Adaptive filtering method to remove ground roll from seismic data. In an M channel adaptive filter, weights W i are set using an adaptive algorithm based on seeking the minimum in the partial differential of cost function J. The cost function includes an expansion of the primary trace d into d=d g +Δd (where: d g is ground roll contribution and Δd=d sig +d ran , where d sig is the reflected signal component and d ran is a random noise component) and a corresponding expansion of the reference x into x=x g +Δx (where x g is ground roll contribution and Δx=x sig +x ran ; where x sig is a reflected signal component and x ran is a random noise component). The delta components are included in the denominator of cost function J to provide an optimal solution of the filter coefficients biased by the reflection signal and random noise is removed.

First claim

What is claimed is:

1. A computer-implemented adaptive filtering method to remove ground roll from seismic data, the method comprising:
providing a seismic data set obtained by exciting a seismic source to generate energy which propagates through a subsurface and is partially reflected by structure in the subsurface to an array of receivers, the receivers thereby receiving reflected signal and additionally also a ground roll contribution;
providing an adaptive filter comprising…

Assignees

• Ji Ying
• Westerngeco Llc

Inventors

• Ji Ying

Classifications

• G01V1/375

  Physics · mapped topic

• G01V1/364 Primary

  Physics · mapped topic

• G01V2210/324

  Physics · mapped topic

• G01V2210/3246

  Physics · mapped topic