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Calculating crosscorrelation and autocorrelation

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Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-1688
... the conventional crosscorrelation method (Wapenaar et al., 2008a; Wapenaar et al., 2008b). We apply MDD to crosswell geometry in order to retrieve crosswell impulse responses from surface sources using numerical modeling and field data. We adopted singular-value decomposition (SVD) for obtaining the...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 8–11, 1989
Paper Number: SPE-19588-MS
... reproduce the logderived lithologic sequences at the wells; they are conditioned by interval velocities inverted from the seismic amplitude data and are consistent with the spatial autocorrelation and crosscorrelation structures of the seismic and well data. The seismically derived lithologic models of the...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216040
... extracted from stacks of ambient noise and signal crosscorrelations and autocorrelations from pairs of sensors and at the same sensor. Data were processed using ambient seismic noise and signal autocorrelation and crosscorrelation algorithms in a package of optimized analysis codes (Tibuleac et al., 2011...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-W21-04
... the located microearthquakes whose first P- and S- wave arrivals are nearly vertical at each of the recording stations, we extract the P- and S-wave coda and then use them as input signals for the application of reflected-wave SI by autocorrelation (Wapenaar et al., 2010). By this, we calculate...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5877507
...-independent anisotropic analysis method can avoid the Dix-type equation. Velocity variations with azimuth (VVAz) are used to detect high anisotropy locations in azimuthally migrated data. We calculate crosscorrelation coefficients at each time sample and find out time lags between different azimuth volumes...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 4–7, 1992
Paper Number: OTC-6839-MS
... calculating Kin, K~, and Cm are done over (-00, +(0), the lattice solution to LSF (1) is identical to that of the autocorrelation method. As previously stated, this method suffers from the window boundary problem for finite x(n) and y(n) .. In addition, this summation also leads to L:nb~-l(n -1) = L:nfl(n...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0890
... successfully retrieve the velocity structure of the earth model. muspac upstream oil & gas wavefield seg houston 2013 impulse response top panel receiver phase velocity frequency surface characterization reflection crosscorrelation real part spatial autocorrelation reservoir...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5707795
... Orleans Annual Meeting Page 192 DOI httpdx.doi.org/10.1190/segam2015-5707795.1© 2015 SEG Surface and downhole recording of pseudorandom vibroseis sweeps Figure 7: Spectra of the pilot and ground-force traces for an Iranpour sweep. Figure 8: Crosscorrelation and autocorrelation envelopes for the Iranpour...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0221
... autocorrelation simultaneous survey reservoir characterization sidelobe vibrator frequency crosscorrelation Establishing the limits of vibrator performance - experiments with pseudorandom sweeps Timothy Dean*, WesternGeco Summary Many methods have been developed over the last 50 years to generate...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0090
... crosscorrelation statistics of outputs. reference list log spectrum decon inverse iteration softclip lobe penalty function upstream oil & gas ricker wavelet log domain coefficient variable gain jon claerbout claerbout antoine guitton reservoir characterization qiang fu Decon in the...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3411521
... Theoretical calculation and many practical observation discrete time-series , this method calculates the average data show that the derivative of crosscorrelation function to time between two ambient noise signals is equivalent to value of absolute amplitude of waveform data in a the empirical Green function...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2988512
... window. Figure 3(a) shows the original ambient-noises in the first 20s window. Setting receiver No. 6 as the reference, crosscorrelation between the other receivers with the reference one is calculated with moving 20s windows that have 50% overlap. The resulting correlograms are then stacked to enhance...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2989426
... , F. , J. Xia , Y. Luo , Z. Xu , L. Wang , C. Shen , R. Liu , Y. Pan , B. Mi , and Y. Hu , 2016 , Multichannel analysis of passive surface waves based on crosscorrelations : Geophysics 81 , no . 5 , EN57 – EN66 , 10.1190...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17746306
... calculation, the convolution type source independent inversion method is used. In this paper, we first simulate the passive seismic records using noise sources, and conduct crosscorrelation to obtain reconstructed records. Then we introduce the convolution type source independent FWI algorithm to invert the...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 1–4, 1977
Paper Number: OTC-2785-MS
... filter, say G (z), where p 1. The first step in our second method also consists of matched filtering by crosscorrelating with the known signature. The next step, however, differs considerably from the approach described above in that a zero-delay Wiener inverse filter for the signature is calculated. The...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0888
... of retrieved non- physical arrivals from body-wave seismic interferometry by crosscorrelation with transient sources (e.g., Wapenaar and Fokkema, 2006). These arrivals appear in the retrieved result due to in- trinsic losses in the medium. The non-physical arrivals arise from correlation of arrivals...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1288
... emerging interferometry terminology. All of the presented interferometry results represent source-domain summation of receiver-by-receiver crosscorrelations of active-source data. Thus, the presented results approximate the Green s function for a given recording geometry convolved with the autocorrelation...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0819
... bandwidth was based on beamforming and power spectral density analyses. Noise at each receiver location was normalized to its maximum amplitude. The crosscorrelation was calculated for each possible pair of locations in the segment (i.e., about 110000 calculation/segment for a total of 33 million...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0582
...(xP,x)G 0 0, 0(xP,x) ] d2xd + 2 cP 0 D [ GS 0, 0(xP,x)G S 0, 0(xP,x) ] d2xd . (6) One can see that the first and the second integrals in equation 6 contain the crosscorrelation between the background wavefield and the perturbed wavefield, which indicates that they are lin- ear with...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1020
... calculated by normalizing a summed trace-to- trace crosscorrelation by a summed autocorrelation of each trace. Normalization is done in the frequency domain. Offsets from 500 to 1500 m are used in the analysis. The result is shown in Figure 6 where we also plot average amplitude spectra of the windowed input...

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