Exploring Inversion Strategies in Image Domain Least Squares Migration

Pereira-Dias, Bruno; Guerra, Claudio; Bulcão, André; Dias, Roberto

doi:10.3997/2214-4609.201803060

Cited by 5 publications

(4 citation statements)

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“…From the latter, four models are selected for comparison based on the following criteria: accuracy of the model, validation in similar gas and liquid environment, overlapping range of the orifice size or gas flow rates, and reproducibility of the model based on the given information in the corresponding literature. These models are M1, Jamialahmadi et al; M2, Dias; M3, Gaddis and Vogelpohl; and M4, Kumar and Kuloor . In most of the models, d b accrues by Q .…”

Section: Resultsmentioning

confidence: 99%

A Mechanistic Model for Bubble Formation from Microscale Orifices under Constant Gas Flow Conditions

et al. 2021

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We developed a mechanistic model for calculation of bubble volume from orifices in the range from 0.03 mm to 0.193 mm under the constant gas flow conditions in a quiescent liquid. It is known that for such small orifices, the mechanism of bubble formation is highly dependent on the gas momentum force and the liquid inertia force. Accordingly, the model incorporates these forces to calculate the bubble volume in three consecutive stages. Moreover, the model includes the influence of the bubble base expansion and bubble rising induced liquid velocity on the formation of bubbles. Eventually the model is validated with our own experimental data using air and deionized water. Experimental validation of the model confirms that the maximum deviation of the model is less than 10%.

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Section: Resultsmentioning

confidence: 99%

A Mechanistic Model for Bubble Formation from Microscale Orifices under Constant Gas Flow Conditions

et al. 2021

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“…Inside the PSDM's border-limit, a myriad of methods is available, ranging from Kirchhoff PSDM to Reverse-Time Migration (RTM). Completing the toolbox of state-of-the-art processing techniques are also Full-Waveform Inversion (FWI) (Ben-Hadj-Ali et al 2008;Barnes & Charara (2009); Operto et al, 2013;Vigh et al, 2014) and Least-Squares Migration (LSM) as per discussed in (Nemeth et al, 1999;Hu et al, 2001;Dias et al, 2017;Wang et al, 2017;Dias et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Geological Characterization of Evaporitic Sections and Its Impacts on Seismic Images: Santos Basin, Offshore Brazil

Maul¹,

Santos²,

Silva³

et al. 2019

Braz J Geophys

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ABSTRACT. The pre-salt reservoirs in Santos Basin are known for being overlaid by thick evaporitic layers, which degrade the quality of seismic imaging and, hence, impacts reservoir studies. Better seismic characterization of this section can then improve decision making in E&P (Exploration and Production) projects. Seismic inversion - particularly with adequate low-frequency initial models – is currently the best approach to build good velocity models, leading to increased seismic resolution, more reliable amplitude response, and to attributes that can be quantitatively connected to well data. We discuss here a few considerations about inverting seismic data for the evaporitic section, and address procedures to improve reservoir characterization when using this methodology. The results show that we can obtain more realistic seismic images, better predicting both the reservoir positioning and its amplitude. Keywords: evaporitic section, seismic imaging, seismic inversion, reservoir characterization, seismic resolution.RESUMO. Os reservatórios do pré-sal da Bacia de Santos são conhecidos por estarem abaixo de uma espessa camada de evaporitos, que degradam a qualidade das imagens sísmicas e impactam os estudos de reservatórios. Melhores caracterizações desta seção podem, então, melhorar o processo de tomada de decisão em projetos de E&P (Exploração e Produção). Inversão sísmica – particularmente com modelos de baixa frequência inicial adequados – é correntemente a melhor abordagem para se construir modelos de velocidades, auxiliando no aumento de resolução sísmica, obtendo-se respostas de amplitude mais coerentes, e tendo seus atributos quantitativamente conectados com as informações de dados de poços. Aqui discutiremos algumas considerações sobre inversões sísmicas para seção evaporítica, e indicaremos procedimentos para melhorar a caracterização de reservatórios quando utilizando esta metodologia. Os resultados mostram que podemos obter imagens sísmicas mais realistas, com melhores predições tanto em termos de posicionamento quanto de sua amplitude.Palavras-chave: seção evaporítica, imagem sísmica, inversão sísmica, caracterização de reservatórios, resolução sísmica.

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“…Despite playing an important role in seismic imaging of subsalt reservoirs, the inclusion of salt stratification is not enough to solve all the imaging issues, because of the unbalanced amplitude below complex salt bodies which may not correctly represent the elastic contrasts in subsurface. Therefore, least-squares schemes seem to be as a cutting-edge tool helping to compensate any poorly illuminated seismic amplitude (Schuster, 1993;Nemeth et al, 1999), and remarkably improving the seismic quality below the salt section, especially in the Santos Basin such as demonstrated in Pereira- Dias et al (2017); Pereira- Dias et al (2018); Shadrina et al (2020). Hu et al (2016) also presented enhancement in the resolution when considering least-squares schemes associated with the Gaussian Bean Migration (LSGBM), which confirms the improvements in resolution when adopting least-squares schemes with migration algorithms.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Salt Stratification Modeling Influences over Reverse Time Migration Considering and not Considering Least-Squares Schemes

Maul¹,

Dias²,

Silva³

et al. 2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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Exploring Inversion Strategies in Image Domain Least Squares Migration

Cited by 5 publications

References 0 publications

A Mechanistic Model for Bubble Formation from Microscale Orifices under Constant Gas Flow Conditions

A Mechanistic Model for Bubble Formation from Microscale Orifices under Constant Gas Flow Conditions

Geological Characterization of Evaporitic Sections and Its Impacts on Seismic Images: Santos Basin, Offshore Brazil

Analysis of Salt Stratification Modeling Influences over Reverse Time Migration Considering and not Considering Least-Squares Schemes

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