Patent Document ID: 9804283
Application ID: 14897002
Patent Status: 1

Claim One:
1. A method for separating seismic data, said method comprising: firing two or more sources in a time overlapping manner using sweep sequences that have low-level cross-correlations, wherein one of the at least two or more sources generates seismic waves using a first sweep sequence and another of the at least two or more sources generates seismic waves using a second sweep sequence, and wherein the low-level cross-correlation is defined as a ratio between (i) a maximum of an auto-correlation of one of the first sweep sequence and the second sweep sequence, and (ii) a mean level of cross-correlation between the first sweep sequence and the second sweep sequence, acquiring seismic data R associated with the firing of the two or more sources; recording a source signature S k for each of the two or more sources; and extracting, by applying a convolution model, a wave field E k associated with each of the two or more sources using the seismic data R and the source signatures S k , wherein the convolution model considers that the seismic data R is a sum of convolutions of corresponding source signatures S k and wave fields E k , a matrix S associated with the source signatures S k is a convolution operator, the wave fields E k are obtained by using the seismic data R and a matrix S T S, which is a product of (i) a transpose S T of the matrix S and (ii) the matrix S, matrix S T S has non-diagonal terms that are cross-correlations of the source signatures S k , and matrix S T S has diagonal terms that are autocorrelations of the source signatures S k .