Nonhyperbolic multiparametric travel-time approximation for converted-wave and OBN data

Zuniga, Nelson Ricardo Coelho Flores

doi:10.11606/t.14.2021.tde-11052021-202215

Cited by 2 publications

(12 citation statements)

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“…The approximation proposed by Zuniga (2021) showed an error of less than 0.02% for the PP reflection event and an error of less than 0.05% for the PS reflection event, which is extremely accurate, even for this controlled situation (Fig. 3).…”

Section: Comparison Of Accuracy Between Both Approachesmentioning

confidence: 74%

“…The approximation proposed by Zuniga (2021) presented a very peculiar behavior concerning its topology. However, the higher sensitivity of parameter 𝛾𝛾 for this equation (with similar behaviour of the RMS velocity), in comparison to the other approach, is important to perform the inversion procedure, once the velocity, which has a physical meaning, still behaves in a known manner, and 𝛾𝛾 becomes a much more effective fitting parameter for recovering velocity information in a more accurate manner.…”

Section: Discussionmentioning

confidence: 97%

“…However, for this approximation, it is difficult to describe this effect for travel-time reflection events of ultra-deep reservoirs, since it was proposed (Wang and Pham, 2001) and tested (Wang et al, 2014) for a water depth of around 1 km. For this reason, Zuniga (2021) has proposed an approximation that is capable of describing the non-hyperbolic effects from the difference of datum between source and receiver for ultra-deep reservoirs. This generalization of Li and Yuan (2003) approximation and the parameter proposed by Wang and Pham (2001) use an additional parameter to describe the effects for which a combination of the two approximations is proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Even though Li and Yuan (2003) approximation has presented very good results in previous works for several geological models, it was not proposed to be used for the kind of scenario tested in many of them. For this reason, it is very desirable to test and to compare its results to the ones related to the approximation proposed by Zuniga (2021) in order to determine if this recently proposed approach is a more appropriate approximation to be used in this kind of scenario. This comparison is essential for complex structures with data obtained with the use of OBN technology, since this approximation (i.e., Zuniga, 2021)…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, it is very desirable to test and to compare its results to the ones related to the approximation proposed by Zuniga (2021) in order to determine if this recently proposed approach is a more appropriate approximation to be used in this kind of scenario. This comparison is essential for complex structures with data obtained with the use of OBN technology, since this approximation (i.e., Zuniga, 2021)…”

Section: Introductionmentioning

confidence: 99%

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Comparison of objective function topology and accuracy between different travel-time approaches for converted wave events

2022

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Abstract. Many non-hyperbolic approximations were proposed to perform the velocity analysis for several effects which cause the non-hyperbolic behaviour in travel-time curves from PP and PS reflection events. With the application of the OBN (Ocean Bottom Nodes) technology, even the approximations that present good results in previous works lack good results when there was a large difference of datum between source and receivers. Recently, a converted wave moveout approach to describe the combined behaviour of many causes which generate the non-hyperbolicity, including the difference of datum, was proposed. In this work, we tested this approach to compare it to the best converted wave moveout approach presented in the last decades. Residual function maps, to study the complexity of the objective function topology and the comparison of travel-time curves, were tested to find which approach is the best option to perform the velocity estimation through an inversion procedure to recover velocity information of non-hyperbolic reflection events of a pre-salt structure obtained with OBN technology.Keywords: converted waves, OBN, non-hyperbolic travel-time Comparação de topologia da função objetivo e de acurácia entre diferentes abordagens de tempos de trânsito para eventos de onda convertidaResumo. Muitas aproximações não-hiperbólicas foram propostas para realizar a análise de velocidade para vários efeitos que causam o comportamento não-hiperbólico na curva do tempo de trânsito a partir de eventos de reflexão PP e PS. Com a aplicação da tecnologia OBN (Ocean Bottom Nodes), mesmo as aproximações que apresentam bons resultados em trabalhos anteriores carecem de bons resultados quando havia grandes diferenças de profundidade entre fonte e receptores. Recentemente, foi proposta uma abordagem para descrever o comportamento combinado de várias causas que geram a não-hiperbolicidade, incluindo a diferença de profundidade. Esta abordagem foi testada para ser comparada com a melhor abordagem apresentada nas últimas décadas. Os mapas residuais de funções objetivo, para estudar a complexidade da topologia da função objetivo e a comparação das curvas de tempos de trânsito, foram testados para descobrir qual abordagem é a melhor opção para realizar a estimativa de velocidades por um procedimento de inversão para eventos de reflexão de estruturas do pré-sal.Palavras-chave: ondas convertidas, OBN, tempo de trânsito não-hiperbólico

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Section: Comparison Of Accuracy Between Both Approachesmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of objective function topology and accuracy between different travel-time approaches for converted wave events

2022

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Comparison between L2- and L1-norm and among optimization algorithms for a nonhyperbolic multiparametric approach for converted-wave and OBN data

Zuniga¹

2022

Braz J Geophys

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As velocity analysis is an important step in seismic processing, several nonhyperbolic travel-time approximations have been proposed during the last decades, and each nonhyperbolic approximation was developed for different conditions and with different proposals. However, none of them was proposed to consider the combined effect of the nonhyperbolicity coming from layered media with large offsets, wave conversion and difference of datum between source and receiver. For this, a nonhyperbolic multiparametric travel-time approximation, which is capable of describing this combination of effects, was recently proposed. As this approximation was developed to characterize ultra-deep reservoirs, the understanding of its behavior is necessary for an offshore reservoir concerning the objective function topology complexity, as it is important for a better understanding of its behavior during the inversion procedure, and also important to determine the kind of optimization algorithm to be used. Performing the inversion procedure with different optimization algorithms and norms is proposed. The complexity analysis of the objective function is also proposed. Then, a comparison between each norm and among each algorithm concerning their accuracy and efficiency is proposed, to find which combination is the most effective to recover RMS velocity information for this kind of scenario.

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Nonhyperbolic multiparametric travel-time approximation for converted-wave and OBN data

Cited by 2 publications

References 54 publications

Comparison of objective function topology and accuracy between different travel-time approaches for converted wave events

Comparison of objective function topology and accuracy between different travel-time approaches for converted wave events

Comparison between L2- and L1-norm and among optimization algorithms for a nonhyperbolic multiparametric approach for converted-wave and OBN data

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