Converted-wave imaging technology and application for complex structures

Wang, Pu; Liu, Junfeng; Chen, Ying; Hu, Tianyue

doi:10.1071/eg13052

Cited by 6 publications

(9 citation statements)

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“…Li and Yuan (2003) proposed an approximation that describes the nonhyperbolicity due to the effects of long-offset, layered media and wave conversion. This approximation has shown quite good results in previous and recent works which tested this equation for converted events and/or OBN data (e.g., Wang and Pham, 2001;Bokhonok, 2011;Wang et al, 2014;Hao and Stovas, 2015;Tseng et al, 2016;Zuniga, 2017;Zuniga et al, 2017;2019c;Lu et al, 2018;Farra and Pšenčík, 2018;Stovas, 2018 and2019;Abedi and Stovas, 2019a).…”

Section: Introductionmentioning

confidence: 83%

“…For this reason, Wang and Pham (2001) have proposed an approximation which generalized the one proposed by Li and Yuan (2003), which can consider the difference of datum between the source and the receivers. 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.…”

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: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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

2022

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“…Several nonhyperbolic approximations were tested in the last years, aiming to find the best one for a specific situation or aiming a general behavior (e.g., Wang and Pham, 2001;Bokhonok, 2011;Wang et al, 2014;Hao and Stovas, 2015;Tseng et al, 2016;Zuniga, 2017;Zuniga et al, 2017Zuniga et al, , 2019Farra and Pšenčík, 2018;Lu et al, 2018;Stovas, 2018, 2019;Stovas, 2019a, 2019b). However, even though the approximation proposed by Li and Yuan (2003) showed the best results in D r a f t a general manner in previous works, more accurate results could be reached if the use of the OBN (Ocean Bottom Nodes) technology would be considered.…”

Section: Introductionmentioning

confidence: 99%

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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“…Performing the velocity analysis using an inversion procedure requires the obtaining of the travel-time curve of the target event. This procedure of velocity analysis demonstrated to be very efficient in different applications, such as for converted wave events in near-surface structures (e.g., Bokhonok, 2011;Lu et al, 2018); q-P reflection events in VTI media (e.g., Aleixo and Schleicher, 2010;Golikov and Stovas, 2012); converted waves in VTI media (e.g., Hao and Stovas, 2015;Tseng et al, 2016); OBN data (e.g., Wang and Pham, 2001;Wang et al, 2014); converted waves and OBN data (e.g., Zuniga, 2017;Zuniga et al, 2017 and2019c); orthorhombic media (e.g., Stovas, 2018 and2019); and anisotropic media (e.g., Li and Yuan, 2001;Li, 2003;Farra and Pšenčík, 2018;Stovas, 2019a, 2019b). Recently, it was also applied, in different processing conditions, such as using different global search and local search optimization algorithms (e.g., Rios and Sahinidis, 2013;Zuniga, 2017), using topological analysis of objective function (e.g., Larsen, 1999;Li and Yuan, 2003;Bokhonok, 2011;Du and Yan, 2013;Lu et al, 2015;Aleardi et al, 2017;Zuniga et al, 2017Zuniga et al, , 2018Zuniga et al, , 2019a and using L1-norm with derivativefree optimization algorithms (e.g., Ji, 2006;Zhang et al, 2014;Zuniga et al, 2019aZuniga et al, , 2019bCosta et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Automated Travel-Time Picking using Spectral Recomposition

Zuniga

Priimenko

2021

Braz J Geophys

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ABSTRACT. To perform the velocity analysis by an inversion procedure, in which the calculated travel-times are compared to the observed ones, there is the necessity of obtaining the travel-time curve observed in the seismogram. However, obtaining the travel-time curve from a reflection event implies in a not-automated picking. Thus, in this work, we propose an automated travel-time picking technique, able to extract the travel-time curves from the target PP and PSv reflection events. Our proposed technique is based on recomposing the spectrum of frequencies of a wavelet by performing the inversion of the wave parameters, especially their amplitudes and peak frequencies. Then, the process is applied to each wavelet of a seismic trace, in which the comparison and cross-correlation among each spectrum, related to each wavelet, are performed. The process is, then, applied to each seismic trace, and, finally, the travel-time curve, related to the target reflection event, is determined. Our proposed technique shows to be effective when it is applied to reflection events from interfaces between the top of a pre-salt carbonate reservoir and the bottom of its salt structure.Keywords: automated picking, inversion, spectral recomposition.Seleção Automática de Tempos de Trânsito usando Reconstrução EspectralRESUMO. Para realizar a análise de velocidades segundo um procedimento de inversão, no qual os tempos de trânsito calculados são comparados aos observados, há a necessidade de obter-se a curva de tempos de trânsito observada no sismograma. Entretanto, obter a curva de tempos de trânsito de um evento de reflexão implica em fazer a seleção manual ou não automatizada destes tempos. Portanto, neste trabalho, uma técnica automatizada de seleção, capaz de extrair a curva de tempos de trânsito dos eventos PP e PSv alvo, é proposta. Essa técnica é baseada em reconstruir o espectro de frequências de uma ondaleta ao realizar a inversão dos parâmetros de onda, especialmente suas amplitudes e frequências dominantes. Então, o processo é aplicado para cada ondaleta de um traço sísmico, no qual a comparação e correlação cruzada entre cada espectro, relacionado a cada ondaleta, são realizadas. O processo é, então, aplicado a cada traço sísmico, e, finalmente, a curva de tempos de trânsito, relacionada ao evento de reflexão alvo, é determinada. A técnica proposta mostra efetividade, quando essa é aplicada em eventos de reflexão oriundos de interfaces entre o topo de um reservatório do pré-sal e o fundo de sua estrutura de sal.Palavras-chave: seleção automática, inversão, reconstrução espectral.

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Converted-wave imaging technology and application for complex structures

Cited by 6 publications

References 6 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

Automated Travel-Time Picking using Spectral Recomposition

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