Broadband, long-offset, full-azimuth, staggered marine acquisition in the Gulf of Mexico

Mandroux, Fabrice; Ong, Beng S.; Ting, Chu-Ong; Mothi, Sabaresan; Huang, Tony Jun; Li, Yunfeng

doi:10.3997/1365-2397.31.6.69643

Cited by 23 publications

(3 citation statements)

References 4 publications

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“…We postulate this new operator based on the premise that the data components recorded at far offset are more non-linear than the waveforms recorded in the near offset range [28]. Despite this non-linearity problem, the waveforms recorded at far offset are extremely important for recovering the deepest regions of the subsurface models [27]. Thus, in order to reduce the non-linearity of the problem, and therefore, do not discard this far offset information, the waveforms recorded in the largest offsets will have greater weight especially for low frequencies.…”

Section: Frequency-dependent Offset-preconditioningmentioning

confidence: 99%

“…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]. Despite these new acquisitions to be efficient to illuminate the deeper part of the subsurface model, due to the wide-angle aperture that they offer, the waveforms' information recorded by large-offsets should be included in the inversion process with caution.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Frequency-dependent Offset-preconditioningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Compared with the older seismic streamer technologies, the present-day OBN acquisition geometries allow the recording of waveforms with much larger angular and azimuthal aperture, which are very useful to generate diving waves for illumination and imaging in areas where the reservoirs are located in ultradeep regions (such as the Brazilian pre-salt). Furthermore, OBN recording is independent of the position of the source vessels, which enables the evaluation of the lower-frequency contents of the subsurface model using waveforms recorded in the far field (Mandroux et al, 2013), in addition to producing a seismic dataset with a high SNR on the quiet seabed, without noise induced by the action of winds, sea waves or boat traffic, for instance.…”

Section: Introductionmentioning

confidence: 99%

Target-oriented refraction waveform inversion: A Brazilian pre-salt case study

Felipe

Capuzzo

Luiz

et al. 2022

Preprint

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The ocean-bottom-node (OBN) technology has been increasingly used to characterize the Brazilian pre-salt reservoirs. The independence between the geometries of seismic sources and receivers, enabled by an OBN survey, permits designing wide-aperture acquisition geometries that favour the recording of refracted waves from ultra-deep reservoirs. In this context, we present a target-oriented full-waveform inversion (FWI) methodology to evaluate the inversion of refracted waves simulated using a realistic velocity model inspired by typical Brazilian pre-salt oil fields. In our tests we compare three acquisition geometries, using the same node configuration on the seabed, but different source geometries: (i) circular shot geometry, (ii) conventional OBN geometry, (iii) long-offset OBN geometry. We perform a wavepath analysis to investigate the illumination of the target region promoted by the refracted waves of a circular shot OBN survey. The wavepath analysis suggests that Brazilian pre-salt reservoirs may be well illuminated using the much fewer source points in a circular shot acquisition geometry. The FWI results with synthetic data show that refracted waves bring important information from the ultra-deep reservoirs which are indispensable for obtaining a reliable final velocity model. We show that adding a low-cost circle shot geometry to a conventional OBN survey delivers improvements from the long-offset data that are comparable to those obtained from the much more expensive long-offset OBN geometry. Furthermore, these results suggest that the long-offset and multi-azimuth dataset has great potential to improve the reservoir characterization in deep-water exploration marine settings.

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Reverse-Time Migration: Principles, Practical Issues, and Recent Developments

Zhang

2015

Seismic Exploration of Hydrocarbons in Heterogeneous Reservoirs

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Broadband, long-offset, full-azimuth, staggered marine acquisition in the Gulf of Mexico

Cited by 23 publications

References 4 publications

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

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

Target-oriented refraction waveform inversion: A Brazilian pre-salt case study

Reverse-Time Migration: Principles, Practical Issues, and Recent Developments

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