Subsalt 3D VSP imaging at Deimos Field in the deepwater Gulf of Mexico

Burch, Tom; Hornby, Brian E.; Sugianto, Hans; Nolte, Bertram

doi:10.1190/1.3447781

Cited by 12 publications

(3 citation statements)

References 9 publications

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“…A target-oriented strategy using a data set obtained by generalized Born modeling based on a single scattering approximation to the full wave equation can use wavefield-based velocity estimation to focus on improving velocities in subsalt regions (Tang and Biondi, 2011). In addition, others focus effort on investigating the impact of acquisition geometries on subsalt imaging (Kapoor et al, 2007;VerWest and Lin, 2007;Burch et al, 2010;Zhu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Staining algorithm for seismic modeling and migration

Chen

Jia

2014

GEOPHYSICS

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In seismic migration, some structures such as those in subsalt shadow zones are not imaged well. The signal in these areas may be even weaker than the artifacts elsewhere. We evaluated a method to significantly improve the signalto-noise ratio (S/N) in poorly illuminated areas of the model. We constructed a "phantom" wavefield: an extension of the wavefield to the complex domain. The imaginary wavefield was synchronized with the real wavefield, but it contained only the events relevant to a target region of the model, which was specified using a staining algorithm. The real wavefield interacted with the entire model. However, all structures except for the target were transparent to the imaginary wavefield, which is excited only when the real wavefront arrives at the target structure. The real and the imaginary source wavefields were crosscorrelated with the regular receiver wavefield. The results were revealed in two images: the conventional reverse time migration image and an image of the target region only. Synthetic experiments showed that the S/N of the target structures was improved significantly, with other structures effectively muted.

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Section: Introductionmentioning

confidence: 99%

Staining algorithm for seismic modeling and migration

Chen

Jia

2014

GEOPHYSICS

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“…Vertical seismic profiling (VSP) surveys differ from surface seismic surveys or crosswell surveys in that the surface sources and the borehole receivers are used to record both upgoing and downgoing wavefields (Stewart et al, 1984;Hardage, 1985;Chang and McMechan, 1986;Hinds et al, 1996). The receiver well is placed near the target area to obtain sufficient reflection waves generated from the reservoir (Burch et al, 2010). The configuration of VSP gives the benefits to understand corresponding geologic logs and provide additional seismic interpretation insights.…”

Section: Introductionmentioning

confidence: 99%

VSP Imaging Using Free-Surface Multiples With Wavefield Decomposition: Synthetic and Field Data Examples

2021

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Vertical seismic profiling (VSP) is an effective technique to provide high-resolution seismic images of the reservoir area. However, the quality of the images is limited by the poor illumination of primary reflection wave. In conventional VSP imaging, only the upgoing primaries are used. Adding free-surface–related multiples into the imaging process can significantly improve the coverage of the illuminated area. Conventional migration methods using multiples need the complex process of multiple prediction. Data-to-data migration (DDM) is an effective imaging technique for multiples in which the recorded data is migrated directly. To improve the imaging quality of DDM in VSP imaging, we propose separating the wavefield into downgoing and upgoing components using Hilbert transform when reverse-time migration (RTM) is implemented in DDM, and the inverse-scattering imaging condition is further applied to the decomposed wavefields. The proposed method eliminates low-frequency noises and false images generated from the conventional cross-correlation imaging condition, and further enhance the illumination in the VSP imaging. Synthetic examples and application to a walkaway field data demonstrate that it can attenuate the noise and improve the imaging resolution effectively. By using DDM with inverse scattering imaging condition and wavefield decomposition based on Hilbert transform, VSP imaging using free-surface–related multiples becomes a practical complement for conventional VSP imaging.

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“…It usually leads to relatively high signal-to-noise ratio and high resolution of VSP data. For example, VSP acquisition can obtain sufficient subsalt information, by placing a development well in the vicinity of a subsalt area of interest, to receive the reflection waves of the target geologic bodies (Burch et al, 2010). In this area, a surface seismic survey usually cannot receive waves that have rays propagated through the target.…”

Section: Introductionmentioning

confidence: 99%

Reverse time migration of 3D vertical seismic profile data

Shi

Wang

2016

GEOPHYSICS

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Reverse time migration (RTM) has shown increasing advantages in handling seismic images of complex subsurface media, but it has not been used widely in 3D seismic data due to the large storage and computation requirements. Our prime objective was to develop an RTM strategy that was applicable to 3D vertical seismic profiling (VSP) data. The strategy consists of two aspects: storage saving and calculation acceleration. First, we determined the use of the random boundary condition (RBC) to save the storage in wavefield simulation. An absorbing boundary such as the perfect matching layer boundary is often used in RTM, but it has a high memory demand for storing the source wavefield. RBC is a nonabsorbing boundary and only stores the source wavefield at the two maximum time steps, then repropagates the source wavefield backwards at every time step, and hence, it significantly reduces the memory requirement. Second, we examined the use of the graphic processing unit (GPU) parallelization technique to accelerate the computation. RBC needs to simulate the source wavefield twice and doubles the computation. Thus, it is very necessary to realize the RTM algorithm by GPU, especially for a 3D VSP data set. GPU and central processing unit (CPU) collaborated parallel implementation can greatly reduce the computation time, where the CPU performs serial code, and the GPU performs parallel code. Because RBC does not need the same huge amount of storage as an absorbing boundary, RTM becomes practically applicable for 3D VSP imaging.

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Subsalt 3D VSP imaging at Deimos Field in the deepwater Gulf of Mexico

Cited by 12 publications

References 9 publications

Staining algorithm for seismic modeling and migration

Staining algorithm for seismic modeling and migration

VSP Imaging Using Free-Surface Multiples With Wavefield Decomposition: Synthetic and Field Data Examples

Reverse time migration of 3D vertical seismic profile data

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