Sub-basalt Imaging of Hydrocarbon-Bearing Mesozoic Sediments Using Ray-Trace Inversion of First-Arrival Seismic Data and Elastic Finite-Difference Full-Wave Modeling Along Sinor–Valod Profile of Deccan Syneclise, India

Talukdar, Karabi; Behera, Laxmidhar

doi:10.1007/s00024-018-1831-z

Cited by 13 publications

(3 citation statements)

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“…Since the mean thickness of the majority of intra‐continental sedimentary basins globally is less than 4 km (Evenick, 2021, and references therein), these sediments will not contribute to the reservoir volatile content. This includes the Narmada‐Tapi rift valley in India (Figure 2) which has a typical sediment thickness less than 3 km (e.g., Evenick, 2021; M. R. Kumar et al., 2015; Rai & Thiagarajan, 2007; Talukdar & Behera, 2018). The presence of the Narmada‐Tapi rift may have other effects associated with the eruption likelihood because magma can ascend along pre‐existing fractures and zones of weakness (Section 6).…”

Section: Proposed Models For Cfb Magmatic Architecturementioning

confidence: 99%

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

2021

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Section: Proposed Models For Cfb Magmatic Architecturementioning

confidence: 99%

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

2021

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“…We apply 2D finite-difference approximation methodology to calculate the synthetic seismic data, using the available viscoelastic model inputs. This method involves the application of 2D wave equation to simulate the propagation of seismic waves in viscoelastic media that is determined by a modified Newton's equation of motion and Hooke's law, as described in [35,36]. We propagate the waves in a 2D viscoelastic medium by computing the 3 strain tensor components along the x-axis and z-axis, and also compute their associated stress tensors.…”

Section: The Synthetic Seismic Data Generation Proceduresmentioning

confidence: 99%

Viscoelastic Model and Synthetic Seismic Data of Eastern Rub’Al-Khali

et al. 2021

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The Rub’ Al-Khali basin in Saudi Arabia remains unexplored and lacks data availability due to its remoteness and the challenging nature of its terrain. Thus far, there are neither digital geologic models nor synthetic seismic data from this specific area accessible for testing research techniques and analysis. In this study, we build a 2D viscoelastic model of the eastern part of the Rub’ Al-Khali basin and generate a corresponding dual-component seismic data set. We compile high-resolution depth models of compressional- and shear-wave velocities, density, as well as compressional- and shear-wave quality factors from published data. The compiled models span Neoproterozoic basement up to Quaternary sand dunes. We then use the finite-difference technique to model the propagation of seismic waves in the compiled viscoelastic medium of eastern Rub’ Al-Khali desert. In particular, we generate vertical and horizontal components of the shot gathers with accuracy to the fourth and second orders in space and time, respectively. The viscoelastic models and synthetic seismic datasets are made available in an open-source site for prospective re-searchers who desire to use them for their research. Users of these datasets are urged to make their findings also accessible to the geoscience community as a way of keeping track of developments related to the Rub’ Al-Khali desert.

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“…For example, Ogunsuyi and Schmitt (2012) applied Zelt's program to estimate a new surface velocity model to highlight materials that make up the paleo-valley of other surrounding rock bodies in a survey of high-resolution seismic reflection. Talukdar and Behera (2018) used the algorithm to aid in imaging complex underground geological structures beneath a highly heterogeneous and thick column of rough basalt layers. It is important to highlight the lack of application of the Rayinvr algorithm for shallow refraction tomography and statics corrections of the seismic reflection data acquired for oil exploration.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Two Refraction Traveltime Tomography Methods Applied for Statics Corrections of Land Data

Gonçalves

Garabito

2021

Braz J Geophys

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ABSTRACT. Many refraction tomography algorithms for statics corrections have model parameterization, forward modeling, and inversion limitations. For instance, most traditional methods use a regular grid to parameterize the model and only invert one parameter, either velocity or thickness of the layer. Generally, these conventional techniques do not allow the simultaneous inversion of traveltimes of turning-rays and head-waves either. In this study, for the first time, we applied and evaluated the well-known 2D refraction tomography algorithm Rayinvr, which is widely used to study deep crustal models, to estimate near-surface layered velocity models and static corrections from real seismic reflection data collected for oil exploration. Here, the Rayinvr and its results are compared with another refraction tomography algorithm widely used in the petroleum industry. It employs the concept of generalized linear inversion and uses a simplified earth model composed of a layer over a half-space, which is parameterized by vertical rectangles of constant velocity. The results of both methods were applied and evaluated on two real datasets of seismic lines located in Brazilian onshore basins. The Rayinvr tomography algorithm provides precise measurement statics corrections, better velocity models, and more reliable geological structures than the standard tomography algorithm.Keywords: refraction, seismic tomography, traveltimes, near-surface geophysics. Avaliação de dois métodos de tomografia de tempos de trânsito de refração aplicados para correções estáticas de dados terrestresRESUMO. Muitos algoritmos de tomografia de refração para correções estáticas têm limitações em re- lação à parametrização do modelo, da modelagem direta e da inversão. Por exemplo, a maioria dos méto- dos tradicionais usa uma malha regular para parametrizar o modelo e apenas invertem um parâmetro, seja a velocidade ou a espessura da camada. Geralmente essas técnicas convencionais também não permitem a inversão simultânea dos tempos de trânsito de turning-rays e head-waves. Neste estudo, pela primeira vez, aplicamos e avaliamos o conhecido algoritmo de tomografia de refração 2D Rayinvr, que é amplamente usado no estudo de modelos crustais profundos, na estimativa de modelos de veloci- dade em camadas próximas à superfície e nas correções estáticas de dados reais de reflexão sísmica coletados para exploração de petróleo. Aqui, o Rayinvr e os resultados são comparados com outro al- goritmo de tomografia de refração, amplamente utilizado na indústria petrolífera. Ele emprega o conceito de inversão linear generalizada e usa um modelo terrestre simplificado composto por uma camada sobre um meio-espaço, que é parametrizado por retângulos verticais de velocidade constante. Os resultados de ambos os métodos foram aplicados e avaliados em dois conjuntos de dados reais de linhas sísmicas localizadas em bacias terrestres brasileiras. O algoritmo de tomografia Rayinvr forneceu correções es- táticas mais precisas, melhores modelos de velocidade e estruturas geológicas mais confiáveis do que o algoritmo padrão de tomografia.Palavras-chave: refração sísmica, tomografia sísmica, tempos de trânsito, geofísica rasa.

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Sub-basalt Imaging of Hydrocarbon-Bearing Mesozoic Sediments Using Ray-Trace Inversion of First-Arrival Seismic Data and Elastic Finite-Difference Full-Wave Modeling Along Sinor–Valod Profile of Deccan Syneclise, India

Cited by 13 publications

References 35 publications

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

The Magmatic Architecture of Continental Flood Basalts I: Observations From the Deccan Traps

Viscoelastic Model and Synthetic Seismic Data of Eastern Rub’Al-Khali

Assessment of Two Refraction Traveltime Tomography Methods Applied for Statics Corrections of Land Data

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