Patent ID: 7260021
Filing Date: 2007-08-21
Classification: G01V

Abstract:
1. A method for processing seismic data, comprising: forming a plurality of correlation data subsets using a plurality of sweep data sets and a correlation reference sequence, wherein forming the plurality of correlation data subsets comprises selecting one of a plurality of pilot sweeps from the correlation reference sequence and selecting a corresponding one of the plurality of sweep data sets; estimating a noise level in a correlation data set using the correlation data subsets, wherein estimating the noise level comprises correlating the selected sweep data sets and pilot sweeps and selecting a portion of the correlation data subset resulting from correlating the sweep data sets and the pilot sweeps, and wherein selecting a portion of the correlation data subset comprises selecting a negative time-lag portion of the correlation data subset; subtracting the estimated noise level from the correlation data set; and forming a low noise correlation data set.