... are as follows. The autocorrelation of base data and crosscorrelation function between base and monitor data are calculated. Suppose is seismic trace of base line and is seismic trace of monitor line, where )(nx )( ny 10 n N . Then autocorrelation function r and crosscorrelation function are defined as )(mxx...

... 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...

... B and V are positively crosscorrelated. In this case, the coefficient of correlation between B and V , which was calculated at the wells, is equal to 0.7. Note that the sign of this correlation may be reversed, for example, when dealing with low porosity sands or over-pressured shales...

... {B(i) = 11 data} = Cy=,6Ji(S)B + a(Z) V(i) t C(Z) 3 (4 where weights wl, . ..w. and a assigned to the data are determined by minimizing the mean square error E{[B(I) - B (3)lz}. Th is minimization only requirea know]. edge of the spatial autocorrelation and crosscorrelation struc- 2 Lithology...

... 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 characterization...

... high anisotropy locations in azimuthally migrated data. We calculate crosscorrelation coefficients at each time sample and find out time lags between different azimuth volumes. These variations in traveltimes with azimuth allow deriving a best-fit sinusoid curve as amplitude variation with azimuth...

... deconvolution methods. It should be clear at this point in the where we use the fac~ that the autocorrelation of an all-pass response is the unit spike. Matched filtering by crosscorrelating with the known source signature; 2. 1. Given the bubble signature xt ' computeits autocorr~lation, whose z-transform is X...

... 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 between them. However, it is certain time window according to formula (1), i.e...

... for non-uniformly sampled data is introduced. Six methods for calculating the integral lengthscale from autocorrelation data are reviewed, and the results discussed for the present jet data measured with LDV. centerline autocorrelation probe correlation curve integration upstream oil & gas...

... the line, starting with the new best statics. Summary The present residual statics processor depends primarily upon crosscorrelations between traces within the same CDP gather. When a sufficient number of CDPs have been proc- essed, the currently best calculated trace shifts are used to calculate surface...

... 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 and Muir sweeps. Figure 9 shows sections of the traces and the amplitude spectra for the limited shuffle and standard Goupillaud...

... of the noise present in the data, especially in the transverse component, which can produce distortion in the calculation of the autocorrelation and crosscorrelation functions. Also we can see that the transverse component loses continuity in some reflections located between 3450 and 3560 ms, which could...

... to 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...

...), plus noise, n(t): x(t) = as(t - to) + n(t) (1) where to is the 2-way travel time Ideally, the vibroseis signal occurs in T/2 5 t < T/2 and its crosscorrelation with r(t) would gice Rex = aRs (T - to) (2) which is a scaled and shifted version of the autocorrelation of s(t). It can be shown using...

... to topography, ocean- oor coupling, and instrument responses. Robust statistical procedures are used for calculating both crosscorrelations and geo- phone autocorrelations. In the second step, the down- going w ave eld which models the predicted multiples is compared with and subtracted from the upgoing w ave...

... are 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...

... noise terms are included in the calculation of C(n), the results are shown in Figure 3. The spectra are visually indistinguishable from Wiener maximum entropy spectra for the same constraint levels of 0.001 (0.1% or -30 dB) and 0.1 (10% or -10 dB) relative to the peak of the transient autocorrelation...

... to 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 pseudoinverse...

... ABSTRACT No preview is available for this paper. crosscorrelation phase analysis estimation upstream oil &amp; gas wavelet reservoir characterization amplitude spectrum phase error time shift synthetic spectrum well control phase function seismic data phase correction...

... are determinated by seismograms recorded in situ. The elastic and plastic waves arise by strong earthquakes. The autocorrelation and impulse functions are calculated on the analog computer for both cases. The aseismic analysis of the dam as a system with many degrees of freedom is made by taking into consideration...