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Keywords: objective function
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Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3577860
... characterization approximation novel prestack basic pursuit upstream oil & gas applied geoscience exploration geophysicist 10 fatti approximation elastic parameter constraint correlation inversion prestack inversion objective function prestack basic pursuit inversion sinopec petroleum exploration...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583318
... to honor the zero-offset two-way-time seismic invariant and keep the short-spread reflections in phase. By combining a pseudotime approach with a graph-space optimal transport objective function, we show that it is possible to reconstruct a complex velocity macromodel from short offset 2D reflection data...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594440
..., in the real world, the objective function of optimization scheme could be non-differentiable. A non-differentiable objective function makes the conventional gradient-based optimization algorithms unfeasible; therefore, we propose to use the primaldual algorithm for solving non-differentiable geophysical...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594168
... anisotropic- which to compute medium property FWI updates, given a non viscoelastic setting. With these extensions the relevance of self-adjoint wave operator, and when the objective function is the RNN grows signi cantly, because in such environments, not analytically differentiable, but some experimentation...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594635
... in a least-squares sense to update the method share similarities to those of correlation or deconvo- model for an improved match. However, the update will be lution based objective functions (van Leeuwen and Mulder, in a right way only if the predicted data are no more than half 2010; Luo and Sava, 2011...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594589
... of the measured data, it can be known that this method can complete the intelligent identification of contaminated soil effectively. neural network applied geoscience artificial intelligence upstream oil & gas anomaly abnormal area fuzzy logic objective function category exploration...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594666
... objective function china university full waveform inversion wavelet upstream oil & gas wavefield boundary tf-fwi normalized source time domain Time-frequency-domain full waveform inversion using a normalized source Jinwei Fang (China University of Mining and Technology, Xuzhou), Qingchen...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594800
... physical that require more modeling realizations. time. The resulting FWI objective function enables the solution of two parameters, velocity model and time- We introduce a novel method that minimizes the data fitting warping extension, in a single optimization problem, which between the synthetic...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3580136
...- the developed methodology to reconstruct the localized time- ifah (2011) and Zhang et al. (2016) propose the following conv- lapse parameter variations even for a strongly distorted source olution-based source-independent FWI objective function in wavelet. The algorithm remains robust in the presence of mod...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3581023
... the objective function, which represents for geothermal energy development (e.g., Jones et al., 1995) possible event location and origin time. We additionally use among many other applications. Most of the time, a single the polarization information from the 3C geophone of the monitoring array deployed downhole...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3582218
... function composed of data misfit, neural network misfit, and a coupling model objective function that links the two inversion schemes through a reference model. We investigate two strategies to update the reference model in the coupling model objective function using either a fully-trained network...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583870
... We developed a viscoelastic waveform inversion (VWI) method to invert 1D P-wave velocity and attenuation ( Q ) models and source parameters using zero-offset vertical seismic profile (VSP) data. The method employs a ray-based waveform computation and combines objective functions of time...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583950
... Geophysical inversion problems have inherent ambiguity that requires regularization terms in the objective function to add prior information and constraints to reduce non-uniqueness. The types of regularization term introduced are different for different applications, but some regularization...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583581
... optimization techniques used in the inversion allow for only approximate minimization of the inversion objective function. Assessing the uncertainty these factors introduce can be difficult, due to the large dimensionality of the inversion problem. Fortunately, complete characterization of inversion...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3567496
... Computational inefficiency in numerical modeling is not unconnected to the inherent dispersion error. Previous efforts have succeeded in establishing a trade-off between accuracy and efficiency. However, we have optimized the dispersion objective function, in the frequency domain, for a tri...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426914
... and the data frequency content, given that the inverse problem is highly non-linear and its solution is non-unique. Particularly, when one considers an elastic wave equation for wavefield extrapolation, if the objective function is purely based on the misfit between modeled and observed data, the quality...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426990
... reservoir characterization objective function basis function artificial intelligence approximation exploration geophysicist 10 algorithm model gradient upstream oil & gas iteration inversion optimization problem mesh seg international exposition data misfit model perturbation...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424413
... logical qubit reservoir characterization objective function iteration physical qubit invert seg international exposition los alamo national laboratory exploration geophysicist 10 qubit quantum annealer An approach to seismic inversion with quantum annealing Sarah Greer*1,2 and Daniel O...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424581
... propose a rock-physics inversion method based on first-order difference regularization to improve the stability. For analysis, the petrophysical relationships based on the Xu-White framework is established. Then, we introduce a first-order difference regularization constraints into the objective function...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3424666
... wavefield are simultaneously used in first arrival traveltime, envelope and waveform fitting, which improves the inversion efficiency. At the same time, the joint inversion method can partly avoid the drift phenomenon of objective function and cycle skipping problems in sequential inversion, and improve...

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