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Reflection/transmission coefficients at small angles and magnitude

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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424753
... We consider a horizontal interface bounded by two triclinic half-spaces to derive the reflection and transmission (R/T) coefficient approximations. To accommodate media where strong anisotropy and/or strong contrasts can present, we consider the second-order approximations and anisotropic...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-245
... Abstract Crack initiation, propagation and coalescence, from pre-cracked rock specimens, were detected in the laboratory using elastic wave transmission and reflection signals. The experiments were conducted on prismatic Indiana limestone specimens with two parallel pre-existing flaws...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 26–29, 2020
Paper Number: SPE-201275-MS
... slightly higher than that of the MLPNN model at 0.9931. The k-fold cross validation results also show the stability of the two models. These ML models are 5 to 6 orders of magnitude faster than CFD models with similar accuracy therefore significantly saving time and cost. We further built a web application...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-133
... submerged barrier in presence of small forward and reversed currents using hydraulic model tests, to understand the analysis and prediction of wave reflection, transmission and loss coefficient under the influence of the existing currents with different directions. The wave attenuation and reflection...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5859284
... reflection coefficient zoeppritz equation sin? 0 coefficient reservoir characterization gradient variation viscous parameter intercept upstream oil & gas equation amplitude three-term approximation incident angle magnitude approximation frequency-dependent reflection coefficient...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13781169
... angle . Therefore, the ratios of numerator to denominator are stable and reliable at small incident angles except when it is less than about . 01 Conclusions In this paper, we present the explicit expression between uniaxial stress and the coefficients of P-wave reflection for a boundary an isotropic...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-3495
...: Magnitude of the exact PP-wave reflection coef- ficient at a VTI/isotropic interface for different inhomo- geneity angles. The quality factors are Q = QP0,1 = 2QS0,1 = 2QP0,2 = 4QS0,2; the other model parameters are listed in Table 1. The asymmetry of the reflection coefficient with respect to = 0...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5924279
..., 2009) can be constructed so as to respond to small-angle backscattered data, e.g., pre-critical specular reflections, in a manner consistent with linearized inverse scattering and AVO inversion (Innanen, 2014). This means a multi-parameter reflection FWI updating scheme can be protected against...
Proceedings Papers

Paper presented at the SPE Hydraulic Fracturing Technology Conference and Exhibition, January 24–26, 2017
Paper Number: SPE-184873-MS
... in Fig. 15 (Case 3-1) and Fig. 16 (Case 3-2), the fracture propagates by following the pre-damage zone in calcite in both the stress initialization settings. A pre-damage zone appears in calcite when the fracture approaches the clay-calcite interface at a right angle ( Fig. 15 (a), (d) and Fig...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0842
...-angle-depended reflection and transmission in three classes reservoirs To systemically illustrate dispersion effects on reflection and transmission coefficient at arbitrary incident angles, we chose three reservoir models correspond to class I, II and III AVO anomalies. Following Ren et al. (2009...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-2020
... transmission filtering effect introduced by the presence of high amplitude coal reflectors. Results indicate that the amount of variation in the transmission filters with angle (or offset) is small compared to the magnitude of the basic spectral notching effect common to all offsets. Comparison of transmission...
Proceedings Papers

Paper presented at the PSIG Annual Meeting, May 5–8, 2020
Paper Number: PSIG-2002
... material, as presented, does not necessarily reflect any position of the Pipeline Simulation Interest Group, its officers, or members. Papers presented at PSIG meetings are subject to publication review by Editorial Committees of the Pipeline Simulation Interest Group. Electronic reproduction, distribution...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-0254
... the AVO response (AVOaz response) of fractured reservoirs is usually modeled using equations for reflection coefficients obtained for plane waves. However, the plane wave approximation can break down at long offsets where incidence angle approaches the critical angle. Since azimuthal variation of AVO...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-659
... is the depth at the seaward toe of the structures. From the results, which include reflection and transmission coefficients and velocity and vorticity fields, it is revealed that the crest width affects the wave and flow behavior in the leeward side of LC breakwaters. KEY WORDS: Low-Crested...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 26–29, 2020
Paper Number: SPE-201563-MS
... modify the transmissibility in the advective flux for the fracture blocks. The fracture deformation is implicitly combined with the matrix deformation, and the fracture effect is reflected through the pore pressure changes of the matrix gridblocks intersected by the fracture segments. At a given time...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-0269
... intercept and gradient, which satisfies the inversion precision only at small incidence angles. However, this may not be the optimum approach for converted-wave AVO analysis since the signal to noise (S/N) ratio is often very low for converted waves at small incidence angles, and the concept of intercept...
Proceedings Papers

Paper presented at the 54th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2020
Paper Number: ARMA-2020-1734
... errors because the borehole tele-viewer is unable to monitor the fracture initiation at the moment of rock fracture. Thus, the new constraint model is proposed to calculate the magnitude of SHmax in this study. Given that in-situ stress in the crust is limited by the frictional coefficient of faults...
Proceedings Papers

Paper presented at the SPE Hydraulic Fracturing Technology Conference and Exhibition, January 23–25, 2018
Paper Number: SPE-189901-MS
... samples for a 30° fault orientation. The variation of μ with respect to the fault orientation is also summarized in Figure 2 . The coefficient of friction for both PMMA and Solnhofen limestone tends to slightly reduce as the fault angle approaches 60° and becomes less steep. The reduction in μ at less...
Proceedings Papers

Paper presented at the SPE Western Regional Meeting, April 23–26, 2019
Paper Number: SPE-195344-MS
...). The value of maximum principal stress was then determined from the value of friction coefficient used in that simulation. To allow the initial fracture transmissivity to vary over several orders of magnitude, e 0 was scaled such that the logarithm of e 0 3 /12 varied uniformly between -17 and...
Proceedings Papers

Paper presented at the CORROSION 2021, April 19–30, 2021
Paper Number: NACE-2021-16404
..., Ni increases the low-temperature fracture toughness due to grain refinement and modification of the ferrite properties. 6 Furthermore, Ni has a low impact on weldability as reflected by its carbon equivalent coefficient, which is the lowest compared with other alloying elements. 1 16404...

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