Ocean Bottom Marine Seismic Methods

Jack, I.

doi:10.1017/9781108913256.007

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…The limitation of 2D seismic acquisition and processing has been well understood by the seismic exploration industry where nowadays the densely sampled marine (also land where possible) surveys brought the tremendous increase of the standards in seismic imaging (Operto et al., 2023; Sedova et al., 2019). Introduction of nodal systems allowed for recording long offset wide azimuth multicomponent data that opened wide range of possibilities in terms of how they can be utilized during processing (Jack, 2021). Indeed, recent decade has shown a massive development of FWI (e.g., ultra‐high frequency FWI (Kalinicheva et al., 2020)) and migration methods (e.g., Reverse Time Migration—RTM and Least‐Squares Reverse Time Migration–LSRTM (Zeng et al., 2014; Zhou et al., 2018)), that coupled with the leading‐edge acquisition systems of multicomponent seismic data constitute nowadays a powerful technology to reconstruct the subsurface models.…”

Section: Introductionmentioning

confidence: 99%

On the Effect of 3D Wave Propagation on 2D Regional‐Scale Velocity Model Building

Górszczyk,

Brossier,

Métivier

2024

JGR Solid Earth

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Active seismic surveys are routinely employed by academia to study geological structure of the crust and upper mantle. Wavefields generated during these surveys are sampled at the receiver locations, but the wave‐paths traveled from a source to a sensor remains unknown. Although seismic acquisition layouts designed to investigate complex crustal‐scale environments are often two‐dimensional, the seismogram recorded at the receiver location represents information gathered along the three‐dimensional wavepaths that might offset from the 2D source/receiver profile along its transverse direction. This so‐called 3D‐effect distorts the results of 2D seismic imaging, which is unable to handle the out‐of‐plane propagation. Despite the numerous 2D seismic imaging case studies, the assessment of this issue is often overlooked. However, the problem exists ‐ especially for crustal‐scale profiles, where seismic energy propagates over distances of hundreds of kilometers and probes different crustal units. In this work we investigate the impact of 3D‐effect on the results of 2D velocity model building from the academic ocean‐bottom seismometer data. We show with polarization analysis how the 3D‐effect can manifest itself in the data domain. Using various scenarios of acquisition we evaluate the imprint of the out‐of‐plane propagation on the data and the results of full‐waveform inversion. We show that 2D velocity model building from the seismic profiles acquired in the complex geological setting can lead to wrong solution. Looking for the remedy to this issue we couple different configurations of acquisition geometries with 3D full‐waveform inversion that allow to handle the 3D effect and provide correct model reconstruction.

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Section: Introductionmentioning

confidence: 99%

On the Effect of 3D Wave Propagation on 2D Regional‐Scale Velocity Model Building

Górszczyk,

Brossier,

Métivier

2024

JGR Solid Earth

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Modeling and inversion in acoustic-elastic coupled media using energy-stable summation-by-parts operators

2023

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Seismic data acquired at the seafloor are valuable in characterizing the subsurface and monitoring producing hydrocarbons fields. To fully use such data, a stable, accurate, and efficient numerical scheme is needed that accounts for acoustic and elastic wave propagation, their interaction at the seafloor interface, and for sources and receivers placed on either side of that interface. Existing methods either make incorrect assumptions or have high implementation and computational costs. We have developed a high-order finite-difference summation-by-parts framework for the acoustic-elastic wave equations in second-order form (in terms of displacements in the solid and an extension of velocity potential in the fluid). Our modified discretization of the elastic operator overcomes the dispersion errors known to plague displacement-based schemes in the high VP/ VS limit. We weakly impose boundary and interface conditions using simultaneous approximation terms, leading to an energy-stable numerical scheme that rigorously handles point injection and extraction. The fully discrete system is self-adjoint after a time reversal and a sign flip and is furthermore a high-order accurate discretization of the continuous problem. The self-adjointness ensures that forward and adjoint wavefields are computed with similar accuracy and simplify gradient computation for inversion purposes. We find that our numerical scheme achieves accuracy comparable to a more computationally expensive spectral-element method and determine its application to a full-waveform inversion using the Marmousi2 model.

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Ocean Bottom Marine Seismic Methods

Cited by 2 publications

References 27 publications

On the Effect of 3D Wave Propagation on 2D Regional‐Scale Velocity Model Building

On the Effect of 3D Wave Propagation on 2D Regional‐Scale Velocity Model Building

Modeling and inversion in acoustic-elastic coupled media using energy-stable summation-by-parts operators

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