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Backus averaging/en

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Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5800873
... 4 5 6 7 -3850 -3800 -3750 Vp in KmêSec D ep th in m et er s Ensemble of upscaled models Best upscaled model Mean 0.1 quantile 0.9 quantile (c)(a) (b) Figure 4: (a) Histogram of layer boundary depths and (b) En- semble of 200 upscaled models extracted at a thinning interval of 200 iterations using...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0291
... (s /k m ) f=0 -0,2 -0,1 0,0 0,1 0,2 0,06 0,08 0,10 0,12 0,14 0,16 0,18 0,20 0,22 0,24 -0,2 -0,1 0,0 0,1 0,2 0,00 0,05 0,10 0,15 0,20 0,25 -0,2 -0,1 0,0 0,1 0,2 0 2 4 6 8 10 12 14 16 En er gy fl ux Horizontal slowness (s/km) -0,2 -0,1 0,0 0,1 0,2 0 2 4 6 8 10 12 14 16 Horizontal slowness (s/km) -0,2...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-1835
... in the denominator of Equation 4. Similarly, ,P vV could be either proportional or inversely proportional to /N G , the prior for this example, depending on the elastic properties of the layers. 0 0.5 1 0 0.05 0.1 0.15 0.2 C D en si ty 0 0.2 0.4 0 0.1 0.2 0.3 0.4 D en si ty 4 6 8 10 12 0 0.1 0.2 0.3 0.4 IP D en si...
Proceedings Papers

Paper presented at the SPE Europec/EAGE Annual Conference and Exhibition, June 12–15, 2006
Paper Number: SPE-100233-MS
... , where ρ is calculated as the volume average of the solid and liquid phase. As a wave passes through the medium local pressure gradients are created that cause the solid and liquid phase ‘en masse’ to stiffen. There are several approaches to calculating the moduli for a saturated medium under...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-4334
... for S-wave impedance. © 2011 SEG SEG San Antonio 2011 Annual Meeting 4336 C-wave spectral broadening: Marcellus shale a narrower bandwidth than the fast C-waves and thus ex- hibit more migration artifacts. Nevertheless, spectral broad- ening significantly improves their resolution in a similar manner...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0393
... the depth distribution of the interval attenuation coefficient caused by the fluid flow through the layer interfaces. The frequency- Sonic log Haar wavelet decomposition Depth, m V p , m /s Depth, m St if fn es s te n so r co m p o n en ts , G Pa DOI httpdx.doi.org/10.1190/segam2013-0393.1© 2013 SEG SEG...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0873
... en tro id fr eq ue nc y (H z) Q = 13 Q = 7 Q = N/A Q = 449 Q = 68 Q = 17 Page 5052SEG Denver 2014 Annual Meeting DOI httpdx.doi.org/10.1190/segam2014-0873.1© 2014 SEG Layer-induced scattering attenuation and VTI anisotropy NW Shelf Australia synthetic study To confirm these findings we also analyze...
Proceedings Papers

Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-1426
... of generalized O Doherty-Anstey formulas. INTRODUCTION Usually, before to reach a reservoir the wavefield must transmit through hundreds or tlrausends of layers. In such si tuat ions an exact computat ion of the t ransmissivi ty i s unwie ldy and i n f ac t ve ry o f t en no t neces sa ry . Therefore, the task...
Proceedings Papers

Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-1628
... op ic c oe ffi ci en ts Fig. 2: Mean values of interval anisotropic coefficients (crosses) and ranges of their effective values e (bars) obtained for 300 models. which would require knowing all interval velocities and anisotropies, one can just calculate the mean ¯i and use it as a reasonable...
Journal Articles
Petrophysics 47 (03).
Paper Number: SPWLA-2006-v47n3a4
Published: 01 June 2006
.... Track 7 in Fig - ure 4 shows the results for the whole sec tion with a par ti - tion ing of the shale con tent into a lam i nated con tent and a non-lam i nated (dis persed/struc tural) con tent. There is clear dif fer en ti a tion between dom i nant lam i nated and dom i nant non-lam i nated sec tions...
Proceedings Papers

Paper presented at the SPE International Petroleum Conference and Exhibition in Mexico, February 1–3, 2000
Paper Number: SPE-59012-MS
... Distance, rD D im en si o n le ss In it ia l P re ss u re Homogeneous Reservoir Eq. 13 CD = 0, s=0 Constant Rate Eq. 14 Eq. 15 0 1000 2000 3000 4000 5000 6000 7000 1 .E+00 1 .E+01 1 .E+02 1 .E+03 1 .E+04 1 .E+05 1 .E+06 1 .E+07 1 .E+08 Dimensionless Time, t D D im en si o n le ss w el lb o re P re ss u re...
Proceedings Papers

Paper presented at the 1989 SEG Annual Meeting, October 29–November 2, 1989
Paper Number: SEG-1989-1034
... distributed heterogeneities in the rock, such as lamination or large en- sembles of geologic entities such as fractures, grains, pores or crystals which exhibit a systematic orientation. How- ever, it is mainly regarded as affecting the low wavenumber (k) component of the wavefield. It is therefore dealt...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1278
... than the fast C-waves and thus ex- hibit more migration artifacts. Nevertheless, spectral broad- ening significantly improves their resolution in a similar manner as the fast C-waves. These spectral corrections are accomplished by nonstation- ary linear filtering in the Fourier domain similar to Mar...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-1718
...). Polynomial fits (solid lines) are examples of compliance density trends that can be used to constrain end points for laminated shaly sands. DW Trends 1.9 2.0 2.1 2.2 2.3 2.4 2.5 0.0 0.1 0.2 0.3 0.4 P Compliance, 1/GPa D en si ty , g /c c shale wet sand gas sand oil sand Figure 4. Compliance-density trends...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0299
...-WesternGeco for providing the field dataset. This paper includes data supplied by IHS En- ergy Log Services; Copyright (2013) IHS Energy Log Services Inc. Yunyue Li acknowledges the sponsors of the Stanford Ex- ploration Project for their financial support. Figure 5: Input of the rock physics modeling from...
Proceedings Papers

Paper presented at the SPWLA 24th Annual Logging Symposium, June 27–30, 1983
Paper Number: SPWLA-1983-NN
... Logging and other Acoustic Measurements, J.P.T., Vol. 17, No. 3, March. Purdy, C. C., 1982, Enhancement of Long Spaced Transit Time Data, Transactions, SPWLA #23. Thanas, D. H. 1978, Seismic Applications of Sonic Logs, Log .Analyst, Jan-Feb. -5- SPW LA TW EN TY-FO URTH AN NUAL LO G G ING SYM PO SIUM...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-1842
... anisotropy, we can identify tw o distinct situations. In the rst case (Figure 3), the change in the P-wave velocity orthogonal to the layering giv en b y Gassmann's equation is smaller than the correct Brown & Korringa prediction. How ever, in the second case (Fig- ure 4) the Gassmann approach gives a higher...
Proceedings Papers

Paper presented at the 1990 SEG Annual Meeting, September 23–27, 1990
Paper Number: SEG-1990-1410
... of the fractured medium: the two isotropic background parameters, x and or. and the dimensionless normal and transverse fracture compliances, EN and B. The relationship between these four parameters and the five TI elastic moduli can be expressed as: r& 2% ~+EN c13 N :I Therefore, from these equations and from...
Proceedings Papers

Paper presented at the 2001 SEG Annual Meeting, September 9–14, 2001
Paper Number: SEG-2001-0165
...-1966. Thomsen, L., 1993. Weak elastic anisotropic reflection. In Castagna, J. P. and Backus, M. M. Eds. Offset-dependent reflectivity-theory and practice AVO analysis: Soc. Exp. Geophys. 103-111. Vavry?uk, V., & P en?ik, I., 1998. PP-wave reflection coefficients in weakly anisotropic media: Geophysics...
Proceedings Papers

Paper presented at the 1986 SEG Annual Meeting, November 2–6, 1986
Paper Number: SEG-1986-0339
.... The reflection seismogram in a lavered earth: Presented at tie 52nd Annual SEG Meeting, ballas. . Castagna, I. P., Batzle, M. L., and Eastwood, R. L., 1985, Relationship bet&en compressional and shear wave velocities in elastic silica6 rocks: Geophysics, 50, 571-581. Gassaway, G. S., 1983, SAMPLE, seismic...

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