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Random-reflection-coefficient model

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Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17674510
... of reflection coefficient and improve the accuracy of the Q value estimation for surface seismic data. The correctness and effectiveness of the proposed method are demonstrated by synthetic record of random reflection coefficient model. Presentation Date: Monday, September 25, 2017 Start Time: 2:40 PM...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5866726
.... Figure 2 is the deghosting result of a synthetic record. 2(a) is a random reflection coefficient model, it has some single layers and some coherent layers; 2(b) is a synthetic record, which is the convolution of the reflection coefficient model and the source wavelet G1(t); 2(c) is a synthetic record...
Proceedings Papers

Paper presented at the The 32nd International Ocean and Polar Engineering Conference, June 5–10, 2022
Paper Number: ISOPE-I-22-423
... the enhancement of kurtosis triggered by the second and third-order effects. Viotti and Dias (2014) verified the change of skewness and kurtosis of random waves propagating over the depth transition by a spectral method. A much-debated question is the fully nonlinear and dispersion model of the wave travelling...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-0312
... computation of composite reflection coefficients for models of reservoirs with internal stratification. These composite coefficient values incorporate the effects of tuning from upper and lower boundaries of an interval, as well as the scattering from the internal boundaries. Models with purely random...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17584882
...% random noise and its deconvolution result are shown in Figure 2a and Figure 2b respectively. The overall feature of reflection coefficient model can be clearly distinguished in Figure 2b. Due to the impact of noise, some small perturbations happen, especially in the third layer. The red solid line, blue...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-0444
... coefficient and density reflection coefficient using pre-stack seismic data. Using Markov chain Monte Carlo (MCMC) method, many samples of each unknown variable are obtained from the Bayesian model, which subsequently are used to infer the unknown variable. Generating S-wave velocity at random, and making use...
Proceedings Papers

Paper presented at the The Fourteenth ISOPE Pacific/Asia Offshore Mechanics Symposium, November 22–25, 2020
Paper Number: ISOPE-P-20-163
... analysis for the pipeline lateral buckling is then performed on the basis of analytical models by Hobbs (1984) etc. The pipe-soil friction coefficient is described by a random variable with an appropriate type of probability distribution to reflect the randomness of pipe-soil interaction. Monte Carlo...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2442
... that the probability of converging to global solution can be improved. In this process, if particles hardly update to the vicinity of global solution as iteration time increases, random scattering was conducted. On the basis of best-so-far layer positions and reflection coefficients, Levenberg-Marquardt (L-M...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2085
... Exposition and Annual Meeting Statistical modeling of reflectivities been developed to simulate random variates and estimate parameters for general stable distributions (e.g. Chambers et al., 1976; Nolan, 1997; Nolan, 2007). The general univariate stable distribution S , , ) is described by four...
Proceedings Papers

Paper presented at the The Fifteenth International Offshore and Polar Engineering Conference, June 19–24, 2005
Paper Number: ISOPE-I-05-246
... coefficients for irregular wave. In this paper, the results demonstrated the effectiveness of the estimation of reflection coefficient for random waves, which clarify the numerical model a feasible scheme. KEY WORDS: Boundary element method, Numerical Wave Tank, Reflection coefficient, Irregular wave...
Proceedings Papers

Paper presented at the The Seventh International Offshore and Polar Engineering Conference, May 25–30, 1997
Paper Number: ISOPE-I-97-370
... dimensional model tests have been done for vertical structures with and without air chambers. The results show that the method presented in this paper can be used to separate reflected waves from random incident waves, and can give accurate reflection coefficient. INTRODUCTION Ocean surface waves...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-3356
... or even due to processing problems. The forward problem of seismic denoising can be written as: where y is the known noisy data, m is the unknown model (noise-free data) and n is the noise. Our objective is to recover m. As seismic data are contaminated with random noise, many methods have been...
Proceedings Papers

Paper presented at the The Eighteenth International Offshore and Polar Engineering Conference, July 6–11, 2008
Paper Number: ISOPE-I-08-129
...-decomposition method. The results of the test of numerical wave generation show that this model is suitable for long time simulation with the reflection coefficient only about 4% for random waves. For regular wave cases, the simulated results show well agreement with linear solution and other numerical models...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-0254
... Summary Azimuthal variation of 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...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-0239
... INTRODUCTION SUMMARY We model azimuthal amplitude variations of seismic P-wave reflections at the top of a layer with a fracture set with arbitrary orientation, embedded in a homogeneous isotropic background medium. We remove the isotropic constituents of the reflection coefficients...
Proceedings Papers

Paper presented at the 2004 SEG Annual Meeting, October 10–15, 2004
Paper Number: SEG-2004-0267
... spaces, propagator matrix methods compute the exact reflection coefficient for a specified frequency and angle of incidence. If the reservoir is homogeneous, the results reproduce those of previous studies. When random layering is included within the reservoir, the reflection coefficient shows strong...
Proceedings Papers

Paper presented at the The Fourteenth International Offshore and Polar Engineering Conference, May 23–28, 2004
Paper Number: ISOPE-I-04-261
... is fairly less than the test data. INTRODUCTION In nature, ocean wave is regarded as a kind of the random wave, Suh and Choi et al (2001) develop an analytical model to predict the reflection characteristic of irregular wave attacking on perforated structures through frequency- average method...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-2857
... coefficients in reducing random noise. Model and real data processing result show that can extract weak reflected signal effectively and improve SNR of signal. noise wavelet function coefficient seismic data wavelet transform seismic section visushrink threshold upstream oil & gas wavelet...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-1991
... for the amplitude of the wavelet at several nodes and uses a spline interpolation scheme to estimate its amplitude in between those nodes. Our method retains all the distinct advantages of VFSA in that it searches a wider model space, chooses a random starting model and thereby has minimal dependence on the initial...
Proceedings Papers

Paper presented at the 1983 SEG Annual Meeting, September 11–15, 1983
Paper Number: SEG-1983-0442
... in Figure 5 for 501 reflection coefficients computed from a random velocity log. We know that velocity and density tend to increase with depth. If a trend is included in the randomly generated velocity samples, the negative side lobes are slightly re- duced. Thus a random velocity model, a model which...

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