Illuminating Santos Basin’s pre-salt with OBN data: Potential and challenges of FWI

Jouno, Florian; Martinez, Adriano; Ferreira, Denis; Donno, Daniela; Khalil, A.

doi:10.1190/segam2019-3215027.1

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…Ocean bottom node (OBN) acquisitions naturally stand out as a great choice since they provide full azimuth coverage with long offsets. Indeed, OBN acquisitions have been crucial for characterizing, for instance, ultra‐deepwater oil reservoirs (Jouno et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Research note: Application of refraction full‐waveform inversion of ocean bottom node data using a squared‐slowness model parameterization

da Silva,

Costa,

Karsou

et al. 2023

Geophysical Prospecting

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Full‐waveform inversion is a wave equation–based imaging technique for obtaining subsurface model parameters by matching modelled with field data. Full‐waveform inversion is often formulated as a local optimization problem in which the model parameterization influences the gradient preconditioner and the convergence rate associated with the full‐waveform inversion objective function. Model parameterization governs the radiation pattern of the so‐called secondary Born source. In this work, we assess model parameterization effects on the estimation of P‐wave velocities using a three‐dimensional acoustic time‐domain full‐waveform inversion procedure. These include the three commonly used parameterization: velocity, slowness and squared slowness. In this context, we consider a field data set from a deepwater Brazilian pre‐salt field using a recently introduced circular shot ocean bottom node acquisition which favours refracted waves. The results reveal that the squared slowness model parameterization provides a satisfactory trade‐off between the reconstruction of the deep pre‐salt target area and convergence rate, saving 50% of runtime compared to the velocity and slowness cases.

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Section: Introductionmentioning

confidence: 99%

Research note: Application of refraction full‐waveform inversion of ocean bottom node data using a squared‐slowness model parameterization

da Silva,

Costa,

Karsou

et al. 2023

Geophysical Prospecting

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show abstract

“…Nowadays, the new acquisitions geometries allow us to record waveforms with an angular aperture (wider offsets) much larger than a conventional survey [26], which is very important to better illuminating the deeper regions of the medium under study. They also allow us to evaluate the lower frequencies of the subsurface model [27].…”

Section: Introductionmentioning

confidence: 99%

An objective function for full-waveform inversion based on frequency-dependent offset-preconditioning

et al. 2020

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Full-waveform inversion (FWI) is a powerful technique to obtain high-resolution subsurface models, from seismic data. However, FWI is an ill-posed problem, which means that the solution is not unique, and therefore the expert use of the information is required to mitigate the FWI ill-posedness, especially when wide-aperture seismic acquisitions are considered. In this way, we investigate the multiscale frequency-domain FWI by using a weighting operator according to the distances between each source-receiver pair. In this work, we propose a weighting operator that acts on the data misfit as preconditioning of the objective function that depends on the source-receiver distance (offset) and the frequency used during the inversion. The proposed operator emphasizes information from long offsets, especially at low frequencies, and as a consequence improves the update of deep geological structures. To demonstrate the effectiveness of our proposal, we perform numerical simulations on 2D acoustic Marmousi2 case study, which is widely used in seismic imaging tests, considering three different scenarios. In the first two ones, we have used an acquisition geometry with a maximum offset of 4 and 8 km, respectively. In the last one, we have considered all-offsets. The results show that our proposal outperforms similar strategies, for all scenarios, providing more reliable quantitative subsurface models. In fact, our inversion result has the lowest error and the highest similarity to the true model than similar approaches.

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Refraction FWI of a Circular Shot OBN Acquisition in the Brazilian Presalt Region

da Silva,

Costa,

Karsou

et al. 2024

IEEE Trans. Geosci. Remote Sensing

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Illuminating Santos Basin’s pre-salt with OBN data: Potential and challenges of FWI

Cited by 10 publications

References 11 publications

Research note: Application of refraction full‐waveform inversion of ocean bottom node data using a squared‐slowness model parameterization

Research note: Application of refraction full‐waveform inversion of ocean bottom node data using a squared‐slowness model parameterization

An objective function for full-waveform inversion based on frequency-dependent offset-preconditioning

Refraction FWI of a Circular Shot OBN Acquisition in the Brazilian Presalt Region

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