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Keywords: covariance matrix
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Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 27–September 1, 2023
Paper Number: SEG-2023-3904696
... is automatically tuned to optimize the sampling efficiency. Furthermore, other than Hessian information, the posterior covariance matrix approximated using previous samples are used to propose a sample in the adaptive algorithm, which further improves the efficiency. The method is implemented with acoustic FWI...
Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 28–September 1, 2022
Paper Number: SEG-2022-3745974
... tomography spectral hydrology applied geoscience covariance matrix energy 10 Spectral hydrology: Resolution and uncertainty in multi-frequency oscillatory hydraulic tomography Jeremy R. Patterson* and Michael Cardiff, University of Wisconsin-Madison Department of Geoscience Summary Imaging the spatial...
Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 28–September 1, 2022
Paper Number: SEG-2022-3749664
... traces to that of the original analytic traces. However, the large computational cost of constructing the covariance matrix, calculating the dominant eigenvalue and the dominant vector restricts its application. By using equivalent simplification and recursion strategies, an efficient implementation...
Proceedings Papers

Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 28–September 1, 2022
Paper Number: SEG-2022-3749878
.... The data covariance matrix is calculated from data residuals obtained from an initial run of FWI, and this is incorporated into the misfit function for a second run. With the elastic FWI conducted in the frequency domain, and the data covariance matrix consequently calculated frequency by frequency...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594236
... geoscience experiment machine learning seismic data covariance matrix exploration geophysicist 10 fundamental mode university noise shear-wave velocity inversion das data dispersion curve interface layer number Trans-dimensional multimode surface wave dispersion inversion of seismic data...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427199
... inversion covariance matrix exploration geophysicist 10 azimuth upstream oil & gas sayer expanded abstract symmetry hydraulic fracturing vertical fracture phase ii model inversion interface monoclinic avaz inversion reservoir characterization bachrach model parameter seg international...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3216353
... strategy by estimating and incorporating the data covariance matrix into time-domain seismic waveform inversion, which is termed Data weighted full-waveform inversion (DWFWI). The data covariance matrix is built from waveform reciprocal errors or from pre-first-arrival signal-to-noise ratio. There are two...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3209254
... covariance matrix represents the correlation between different parameters. This abstract proposes a novel decorrelation method conducted on the multivariate covariance matrix of prior multivariate Gaussian distribution in the Bayesian linear inversion. The synthetic seismogram is obtained from...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2993625
... (Anaheim Convention Center) Presentation Type: Oral seg international exposition zoeppritz equation full zoeppritz equation seismic inversion ensemble-based joint inversion upstream oil & gas covariance matrix reservoir characterization reservoir property model uncertainty reservoir...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2995155
... property petrophysically geophysical model seg international exposition iteration upstream oil & gas inversion misfit geophysical data geophysical inversion petrophysical model covariance matrix joint inversion knowledge geological modeling algorithm machine learning objective function...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997356
... seismic facies classification generative topographic mapping principal component facies covariance matrix Roy , A. , 2013 , Latent space classification of seismic facies : Ph.D. Dissertation , The University of Oklahoma , 212 . Hampson , D. , J. S. Schuelke , and J...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2997546
... matrix. In this work, we focus on the computation cost of this widely-used coherence algorithm and try to propose one implementation to reduce this cost without lowering the visual quality. We give up calculating the eigendecomposition of one large covariance matrix, but calculate the eigendecompositions...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17675414
... for azimuthally limited data volumes. Like multispectral coherence, we modify the covariance matrix to be the sum of the covariance matrix of each azimuthally limited volume, then use the integrated covariance matrix to compute the coherent energy. Presentation Date: Wednesday, September 27, 2017 Start Time: 3...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17627034
.... Presentation Date: Tuesday, September 26, 2017 Start Time: 1:50 PM Location: Exhibit Hall C, E-P Station 2 Presentation Type: EPOSTER compute realisation noise field reservoir characterization suppression covariance matrix noise property noise energy birnie upstream oil & gas annual...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17654776
... annual meeting subsurface rayleigh-wave dispersion curve seg seg international exposition reservoir characterization model parameter covariance matrix stratified media upstream oil & gas phase velocity fundamental mode anisotropy higher mode university parameterization inversion...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17653874
... correlation scale lengths than other sediments, information which we incorporate into the prior covariance matrix. This paper has been withdrawn from the Technical Program and will not be presented at the 87th SEG Annual Meeting. structural geology seg seg international exposition metals...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17659394
... ABSTRACT The statistical correlation among the elastic parameters is one of the reasons why pre-stack inversion are commonly unstable. Based on previous studies, we proposed an improved decorrelation method. In this paper, we used the covariance matrix to convert the correlative data...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17791475
...: ORAL case study upstream oil & gas pairwise sacrey smith artificial intelligence independence table covariance matrix independence annual meeting machine learning vendor selection list matrix high independence seg seg international exposition reservoir characterization...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17739097
... by selecting a directional Gaussian preprocessing kernel and applying a 3D rotational matrix to its covariance matrix. By weighing traces, or voxels, in the analysis cube by their relative proximity to the reference trace or voxel, this approach greatly enhances the clarity of the attribute. Furthermore...
Proceedings Papers

Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17774229
... noise covariance matrix Chopra , S. , and K. J. Marfurt , 2014 , Churning seismic attributes with principal component analysis : 84th Annual International Meeting, SEG, Expanded Abstracts , 10.1190/segam2014-0235.1 . Kamp , P. , 2004 , Neogene stratigraphy...

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