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Backus filter/es

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Proceedings Papers

Paper presented at the SPE International Petroleum Conference and Exhibition in Mexico, February 1–3, 2000
Paper Number: SPE-59012-MS
... contains acquisition noise, such as white and truncation errors, Backus and Gilbert´s method will perform badly unless we use a filtering technique11-13 or the pressure integral function proposed by Blasingame et. al.14. The problem to reproduce the initial distribution with noisy data is in agreement with...
Journal Articles
SPE Formation Evaluation 7 (04): 290–296.
Paper Number: SPE-20555-PA
Published: 01 December 1992
... filtered them with our resolving kernel, we would obtain the solutions shown in this paper. In deriving the theory for this inversion procedure, I assumed single-phase flow of a slightly compressible fluid, constant-rate drawdown, small permeability variation, constant porosity, and reservoir thickness...
Proceedings Papers

Paper presented at the 1993 SEG Annual Meeting, September 26–30, 1993
Paper Number: SEG-1993-0642
... wavelet superposition basis function thickness interface seismic wavelet seismic data thin layer A Matched-Filter Approach to Impedance Estimation S13.2 James L. Simmons, Jr.* and Milo M. Backus, University of Texas at Austin Summary Conventional poststack inversion algorithms parameterize the...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3211053
... Zoep- pritz equations (Aki and Richards, 1980; Wiggins et al., 1983; Shuey, 1985; Fatti et al., 1994) instead of the Zoeppritz equa- tions themselves. However, linearization results in a less ac- curate representation of the wave behavior. They can only es- timate the variation of reflection...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3211060
.... Chavent , 1979 , Identification de param tres r partis dans les quations aux d riv es partielles : RAIRO , 13 , 115 – 126 . Fatti , J. L. , G. C. Smith , P. J. Vail , P. J. Strauss , and P. R. Levitt , 1994 , Detection of gas in sandstone reservoirs...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3214459
... , D. , C. Puhrsch , and R. Fergus , 2014 , Depth map prediction from a single image using a multi-scale deep network : Advances in Neural Information Processing Systems , 2366 – 2374 . Fomel , S. , 2002 , Applications of plane-wave destruction filters...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17495603
... timeshifts. Use of high frequency components mitigate problems associated with sidelobe interference. We use amplitude-adjusted plane-wave destruction (APWD) filters to invert for both timeshifts and amplitude changes between the time-lapse seismic images at each frequency. Plane-wave destruction can...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0291
... stratigraphic filtering. Stovas et al. (2013) proposed a method to extend the Backus upscaling method to low-frequencies and used the wavelet amplitude spectrum to weight averaging of the frequency-dependent effective parameters. In this paper, we extend this method to high-contrast media and TTI anisotropy...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0950
... filters in X-T domain or F-X deconvolution applied after flattening the first arrivals. We also apply a divergence correction using of (Newman 1973). As this correction does require velocity information, we use first break picks to estimate interval and RMS velocity. 2. Computation of attributes related...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2307
... upper half. fA Deconvolution filtering in the local wavenumber domain. Due to the calculation of the kernels for the resolution operator (resolving kernel) (Backus and Gilbert, 1970; Tarantola, 1984; 2005; Wu, 2007) and volume deconvolution in space domain are intractable, we deconvolve the image with...
Journal Articles
Journal: SPE Journal
SPE Journal 14 (04): 746–758.
Paper Number: SPE-110771-PA
Published: 23 September 2009
... seismic trace (Gunning and Glinsky 2004). Synthetic traces corresponding to particular realizations are shown in black with the actual seismic data (gray). Impedance, Layer 1 (gm/cc) (m/s) Impedance, Layer 1 (gm/cc) (m/s) Impedance, Layer 1 (gm/cc) (m/s) Net-to-Gross, Layer 2 Th ic kn es s, L ay er 2 (m...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2998
... SUMMARY Conventional semblance methods can be avoided for a number of imaging tasks if local slopes can be directly extracted from prestack data, for example, by filtering schemes. Recent literature shows a revival of the idea for various purposes, such as velocity analysis, tau-p imaging...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2123
... in- verse filter applied to remove the residual multiple (Paf- fenholz and Barr, 1995), K(f) = (1 + r (f))2 [ 1 2 , 1 2 ] . (9) After the direct sum, the remaining multiple response has a finite-length inverse filter which happens to be the Backus filter. New Techniques and SNR Bounds Optimal...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-2449
... since wavelet errors propagate through the whole process. Figure 1 shows the elements of a well tie. A broadband primaries synthetic seismogram (trace 2) constructed from a calibrated acoustic impedance log (trace 1) is matched to a seismic trace segment (traces 4 and 6). The filter that converts the...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-0273
... and random error, respectively. Of particular interest is R = HW, (4) the resolution R. Rows of the resolution matrix can be considered as filters acting on the real model to give the observed model. Consequently, we could design the in- verse operator such that the resolution is closest to the...
Journal Articles
Petrophysics - The SPWLA Journal of Formation Evaluation and Reservoir Description 43 (02).
Paper Number: SPWLA-2002-v43n2a4
Published: 01 March 2002
... assumed pattern of cycles within the data series. Secondly, based on the prediction error calculation, Prediction Error Filter Analysis (PEFA) calculates the position and amplitude of breaks in the frequency successions or breaks in the phase of each cycle present within the total frequency. Finally, the...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-190
... wird die Wellenausbreitung manchmal stark behindert durch die Interferenz mehrfach gestreuter Wellen (sogenanntes "stop-pass" Verhalten). Es konnte gezeigt werden, dass Wellen, welche sich parallel zu den Kluften ausbreiten, mehrere gebundelte Eigenfunktionen aufweisen mit Geschwindigkeiten und...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-0175
.... Equations (10) and (11) may be readily solved in the frequency domain: = + = (14) (15) S,(w) is the power spectrum of the noise, and Ss(w) is the power spectrum of the underlying reflection ensemble. An es- sential difference between this approach and Corcoran s is the presence of the H1 filter, which...
Journal Articles
SPE Formation Evaluation 12 (02): 137–144.
Paper Number: SPE-30589-PA
Published: 01 June 1997
... better resolve lo- cal permeabilities, and the degree of averaging associated with our es- timates will be minimized. In this paper, we first develop a formalism to quantify the resolu- tion and spatial averaging associated with permeability estimates us- ing interwell tracer and transient-pressure data...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-0111
... scatter in the sand points occurs over the transition from good reservoir (left) to shaley reservoir rocks of 3050% shale. While it is easy to identify these zones based on trends seen in the crossplot, both crossplots show overlap in sand and shale properties. This is es- pecially true for our channel...

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