3D High-Resolution Imaging Using Separated Wavefields

Lu, Shaoping; Whitmore, N.D.; LeGleut, Hui; Long, Andrew

doi:10.3997/2214-4609.20130088

Cited by 15 publications

(2 citation statements)

References 4 publications

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“…For improved image resolution and quality control, we deployed separated-wavefield imaging (Rønholt et al 2014), where the multiple energy is imaged to achieve improved illumination of the subsurface. This methodology also provides increased angular coverage that enables better quality control of the near surface velocities (Whitmore et al, 2010, Lu et al, 2013. A successful FWI velocity update should result in a well-focused and structurally simplified image with substantially reduced false pull-up/push-down effects caused by near surface velocity anomalies.…”

Section: Methodsmentioning

confidence: 99%

Full Waveform Inversion - A Case Study Over the Valemon & Kvitebjørn Fields, Norwegian North Sea

Korsmo¹,

Synnevåg²,

Fjellanger³

et al. 2015

Proceedings

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A case study was carried out over the Valemon and Kvitebjørn Fields, where a high fidelity velocity model was built to solve the complex velocity variations in the overburden. A shallow channel system, several gas pockets and a glacial wedge causes distortions in imaging unless they are incorporated to the velocity model. Through full waveform inversion (FWI) we solve the strong lateral velocity variations in the near surface. Dual sensor streamer broadband acquisition, processing and Q-Kirchhoff pre stack depth migration (PSDM) has resulted in a significantly improved structural imaging.

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Section: Methodsmentioning

confidence: 99%

Full Waveform Inversion - A Case Study Over the Valemon & Kvitebjørn Fields, Norwegian North Sea

Korsmo¹,

Synnevåg²,

Fjellanger³

et al. 2015

Proceedings

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show abstract

“…To overcome this challenge we have isolated the refracted events and used these in full waveform inversion (FWI) to obtain a high-resolution velocity model that captures the shallow background velocity trends and the channel(s). Separated wavefield imaging (Whitmore et al, 2010, Lu et al, 2013 yields superior illumination and angular coverage in shallow water and has been used to QC the FWI model (Rønholt et al 2014). After solving for the shallow overburden velocity complexity, wavelet shift tomography was used to update the deeper part of the velocity model.…”

Section: Introductionmentioning

confidence: 99%

Improved Velocity Estimation and Imaging Using Multiple Wavefield Components - A North Sea Case Study, Brage Field

Raya¹,

Midttun²,

Korsmo³

et al. 2015

Proceedings

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A case study was carried out over the Brage Field, where high fidelity velocity model was built to solve the complex velocity variations in the overburden. The shallow channel system was captured in the velocity model by the use of an integrated workflow combining refractions, multiples and reflections. Solving for the strong lateral velocity variations in the near surface resulted in significant movements of the target structures.

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Migration of primaries and multiples using an imaging condition for amplitude-normalized separated wavefields

et al. 2014

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Migration of primary and multiple reflections leads to enhanced subsurface illumination and to increased image resolution. A joint migration approach using the complete wavefield requires properly imaged primaries and multiples of all orders. In recent works, primaries and multiples have therefore been imaged separately, using the upgoing and downgoing pressure wavefields obtained by decomposing dual-sensor streamer data. The matches between the corresponding depth images are still not found to be sufficiently accurate, so new and more appropriate imaging conditions need to be found. We reviewed the classical imaging approach used in one-way wave-equation migration, with the aim of extending it for simultaneous migration of primaries and all orders of multiples. Based on Rayleigh’s reciprocity theorem and well-known theoretical developments, we derived a new imaging condition described in terms of the upgoing pressure wavefield and a filtered version of the downgoing vertical-velocity wavefield. To evaluate the efficiency of this new imaging approach, primaries and multiples were separately migrated using synthetic and real data examples. These results were compared to those obtained using a conventional imaging condition. We found that the use of the new imaging condition led to a better match between the depth images and spectra of the migrated primaries and migrated multiples.

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3D High-Resolution Imaging Using Separated Wavefields

Cited by 15 publications

References 4 publications

Full Waveform Inversion - A Case Study Over the Valemon & Kvitebjørn Fields, Norwegian North Sea

Full Waveform Inversion - A Case Study Over the Valemon & Kvitebjørn Fields, Norwegian North Sea

Improved Velocity Estimation and Imaging Using Multiple Wavefield Components - A North Sea Case Study, Brage Field

Migration of primaries and multiples using an imaging condition for amplitude-normalized separated wavefields

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