Combining seismic facies analysis and well Information to guide new interval velocity models for a Pre-Salt study, Santos Basin, Brazil

Meneguim, Talles Barsanti; Mendes, Soraia Carlos; Maul, Alexandre; Fernandes, Lívia Falcão; Farias, Maria Gonzalez; González, Gaspar

doi:10.1190/sbgf2015-271

Cited by 26 publications

(17 citation statements)

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“…7C). The importance of considering the model-based inversion approach to better establish the stratification is well exemplified and documented in several works (Meneguim et al, 2015;Teixeira et al, 2017;Toríbio et al, 2017;Barros et al, 2017Teixeira et al, 2018;Maul et al, 2019aMaul et al, , 2019bTeixeira & Lupinacci, 2019).…”

Section: Results Analysis and Discussionmentioning

confidence: 99%

“…The methodology was tested in several seismic processing projects. Moreover, we also tested those models for new seismic design studies such as illumination studies , uncertainty analysis regarding both depth and lateral positioning and accuracy in reservoir property distribution (Meneguim et al, 2015;Paes et al, 2019), security in well drilling (Teixeira et al, 2015), geomechanical flow simulation (Teixeira et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…The first part of the methodology applied in this project follows the workflow presented in González et al (2016), see Figure 1. This method allows the insertion of the salt stratifications or the layered sequence using seismic acoustic inversion (as presented by Meneguim et al, 2015), or any other seismic attribute if the inversion output is not available. The 1D analysis is performed with well logs and cutting supporting all stages.…”

Section: Methodsmentioning

confidence: 99%

“…These features probably are the part of the seismic response of interbedded layers as mentioned by Jones & Davison (2014). Since 2015, several results related to the evaporitic stratification modeling intending to enhance the pre-salt projects have been presented Jardim et al, 2015;Meneguim et al, 2015). Maul et al (2018b) summarize and state these features as the evaporitic stratifications caused by the mineral variation.…”

Section: Introductionmentioning

confidence: 98%

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Improving Pre-Salt Reservoirs Seismic Images When Considering the Stratified Evaporites Insertion in the Initial Model for the Velocity Updating Processes Prior to the Seismic Migration

Maul¹,

Santos²,

Silva³

et al. 2019

Braz J Geophys

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ABSTRACT. Structurally complex areas, such as the pre-salt section in the offshore Santos Basin, SE Brazil, is a challenge to represent the geology using seismic images. One of the main causes of the observed imaging problems is the evaporitic section and its considerations about velocities used for seismic migration purposes. Some authors consider set to this section an almost constant value (close to 4,500 m/s) which approximately represents the halite velocity, the most abundant mineral in this salt formation. Others, over these models, apply the tomographic inversion or FWI schemes giving to the velocity model the mathematical support to build confident seismic images. We believe in the importance to build starting velocity models reflecting the existing geological features prior to applying the tomographic/FWI updating. In this sense, we propose the insertion of the so-called stratifications within the evaporitic section using an adaptation of the model-based seismic inversion technique. Following this new velocity model including the stratification, we suggest tomographic iterations update, or FWI, to add to the geological constrains of the model the needed mathematical convergence. Finally, in this work, we performed the seismic migration with and without inserting these geological features in the initial velocity model and compared the results.Keywords: evaporitic section, stratifications, velocity model, seismic migration, seismic image.RESUMO. Em áreas estruturalmente complexas, como na seção pré-sal da Bacia offshore de Santos, região SE do Brasil, é um desafio representar a geologia utilizando imagens sísmicas. Uma das principais causas dos problemas observados está nas considerações sobre a seção evaporítica e suas velocidades com propósito de migração sísmica. Alguns autores consideram esta seção como tendo velocidades aproximadamente constantes (próximas de 4.500 m/s), o que representa aproximadamente o comportamento da halita, o mineral mais abundante nesta seção. Outros, sobre este modelo aplicam a atualização por inversão tomográfica ou FWI para dar ao modelo de velocidades o suporte matemático necessário para construir imagens sísmicas confiáveis. Nós acreditamos na importância de construir modelos iniciais de velocidades que reflitam as características geológicas existentes antes de aplicar esta atualização tomográfica/FWI mencionada. Neste sentido, propomos a inserção das denominadas estratificações dentro da seção evaporítica, utilizando uma adaptação da técnica de inversão sísmica model-based. Seguindo este novo modelo incluindo as estratificações, sugerimos a atualização por iterações tomográficas, ou FWI, para adicionar ao controle geológico do modelo a convergência matemática necessária. Finalmente, neste trabalho, nós realizamos a migração com e sem a inserção destas características geológicas no modelo inicial de velocidades e comparamos os resultados.Palavras-chave: seção evaporítica, estratificações, modelo de velocidade, migração sísmica, imagem sísmica.

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Section: Results Analysis and Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Improving Pre-Salt Reservoirs Seismic Images When Considering the Stratified Evaporites Insertion in the Initial Model for the Velocity Updating Processes Prior to the Seismic Migration

Maul¹,

Santos²,

Silva³

et al. 2019

Braz J Geophys

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“…The method takes into account seismic response (interface reflectors) derived from the presence of lithologic stratification within the evaporitic section, characterized by the presence/alternance of Halite, Anhydrite, Tachydrite, Carnallite, Sylvite and other evaporites (Oliveira et al, 2015;Amaral et al, 2015;Meneguim et al, 2015Meneguim et al, , 2016Gobatto et al, 2016), as well as possible presence of igneous rocks as described in Oliveira et al (2015).…”

Section: Methodsmentioning

confidence: 99%

Results of Incorporating the Stratigraphy Within the Evaporitic Sequence Into the Velocity Field for Reservoir Characterization

Falcão¹,

Maul²,

Gobatto³

et al. 2016

Rev. Bras. Geof.

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ABSTRACT. There are many ways to build velocity models for seismic migration purposes, either by using inversion algorithms, approximations by constant or variables velocities, including or not including anisotropic parameters, etc...Keywords: amplitude responses, attributes, salt, pre-salt, uncertainties. RESUMO. Atualmente existem muitas alternativas para construção de modelos de velocidades para propósitos de migração sísmica, seja usando algoritmos de inversão ou aproximações por estimativas de velocidades constantes e/ou variáveis, inserindo ou não parâmetros de anisotropia, etc.Palavras-chave: respostas de amplitude, atributos, sal, pré-sal, incertezas.

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The impact of heterogeneous salt velocity models on the gross rock volume estimation: an example from the Santos Basin pre-salt, Brazil

Maul

Cetale

Guizan

et al. 2021

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The thick and heterogeneous salt section in the Santos Basin, offshore Brazil, imposes great challenges to access the pre-salt hydrocarbon reservoirs, especially in relation to seismic imaging, signal quality, and depth positioning. Some problems arise from the current velocity models for the salt section, which for the majority, assume the salt is a homogeneous halite layer. In the Santos Basin, the commonly assumed salt - halite - only makes up to 80% of the mineral in this section. The inclusion of other salts as stratification in the velocity models, based on seismic attributes, has achieved good results in the last decade, especially for depth resolution. In this work, we analyze the benefits of different velocity models, considering presence/absence of salt stratification, and comparing the gross rock volume above the oil-water contact. The results show a significant effect on depth resolution of the events, as well as on volume estimation, indicating that more reliability captured by the complex velocity models will ensure the more confident the resulting volumetric information is.

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Combining seismic facies analysis and well Information to guide new interval velocity models for a Pre-Salt study, Santos Basin, Brazil

Cited by 26 publications

References 1 publication

Improving Pre-Salt Reservoirs Seismic Images When Considering the Stratified Evaporites Insertion in the Initial Model for the Velocity Updating Processes Prior to the Seismic Migration

Improving Pre-Salt Reservoirs Seismic Images When Considering the Stratified Evaporites Insertion in the Initial Model for the Velocity Updating Processes Prior to the Seismic Migration

Results of Incorporating the Stratigraphy Within the Evaporitic Sequence Into the Velocity Field for Reservoir Characterization

The impact of heterogeneous salt velocity models on the gross rock volume estimation: an example from the Santos Basin pre-salt, Brazil

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