VSP migration by single shot record inversion

Harwijanto, Josef; Wapenaar, Kees; Berkhout, A. J.

doi:10.3997/1365-2397.1987012

Cited by 3 publications

(3 citation statements)

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“…Migration of single-shot, single-receiver or VSP data can be achieved by a number of techniques, including finite difference [Chang and McMechan, 1986], Fourier transform [Temme and Miiller, 1986], plane wave transformation [Ternroe, 1984], Kirchhoff summation [Hu and McMechan, 1986], and diffraction stack [Harwijanto et al, 1987]. For wide-angle data the migration algorithm must be robust for source-receiver distances much larger than the depth to reflector, and because wide-angle data are commonly low fold and noisy, it is important that migration noise be minimized.…”

Section: Prestack Migration Of Noisy Datamentioning

confidence: 99%

Migration of wide‐angle seismic reflection data from the Grenville Front in Lake Huron

Milkereit¹,

Epili²,

Green³

et al. 1990

J. Geophys. Res.

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Under the auspices of the Great Lakes International Multidisciplinary Program on Crustal Evolution (GLIMPCE), coincident steep-and wide-angle seismic reflection data sets were acquired in Lake Huron. The wide-angle data were recorded at stationary onshore receivers during the shooting and recording of the conventional marine steep-angle survey. To extract information from the wide-angle data, a variety of processing techniques including automatic trace editing, amplitude balancing, F-K filtering, static corrections, and predictive deconvolution were applied to the wide-aperture commonreceiver gather before migration. The application of a slowness-weighted depth migration algorithm, which was first tested on synthetic data and which included a slowness filter, resulted in an image of the Grenville Front tectonic zone (GFTZ) remarkably similar to that observed in the multichannel steep-angle section. The migrated wide-angle data suggest that prominent bands of east dipping seismic reflections observed across the GFTZ extend unattenuated to depths of at least 45 km.

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Section: Prestack Migration Of Noisy Datamentioning

confidence: 99%

Migration of wide‐angle seismic reflection data from the Grenville Front in Lake Huron

Milkereit¹,

Epili²,

Green³

et al. 1990

J. Geophys. Res.

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show abstract

“…Several VSP imaging techniques are discussed in literature addressing these limitations. Some examples include imaging by single shot record inversion (Harwijanto, Wapenaar and Berkhout ), Ray‐Born based elastic migration (Nicoletis et al . ), reverse time migration (Hokstad, Mittet and Landral ; Neklyudov and Borodin ), interferometric migration using extrapolated VSP Green's functions (Xiao and Schuster ), wavefield extrapolation and depth imaging (Amundsen ), VSP‐CDP mapping techniques (Gulati, Stewart and Ulrych ; Chen, Peron and Canales ) and the use of image point transformation (Cosma, Balu and Enescu ).…”

Section: Introductionmentioning

confidence: 99%

Full‐wavefield migration of vertical seismic profiling data: using all multiples to extend the illumination area

Soni

Verschuur

2014

Geophysical Prospecting

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Vertical seismic profiling data can provide a high‐resolution reservoir image because the receivers are located close to the reservoir and, hence, the wavefield encounters less distortion in the overburden compared to surface seismic data. However, conventional migration of vertical seismic profiling data using only upgoing primary wavefields often suffers from poor illumination, imaging artefacts and low image reliability, especially at image locations away from the well. We propose full‐wavefield migration to image vertical seismic profiling data using the primaries and all orders of surface multiples and internal multiples. The downgoing internal or surface multiples are treated as an additional source of illumination. In full‐wavefield migration, we aim to estimate a high‐resolution reflectivity image of the subsurface with this extended illumination. The algorithm is recursive in depth like conventional wavefield extrapolation‐based migration, however, it incorporates the non‐linear transmission and scattering effects at each depth level. Further, full‐wavefield migration is posed as a constrained least‐squares inversion problem that could be solved using a conjugate gradient method. We propose an iterative full‐wavefield forward modelling engine as the backbone of this inversion scheme. The parameter used in the modelling is subsurface reflectivity. Full‐wavefield modelling iteratively incorporates the non‐linearity of the wavefield due to multiple scattering, where every iteration utilizes one higher order of scattered wavefields to estimate the subsurface reflectivity. In addition, the constrained inversion helps in reducing the extrapolation artefacts and provides a high‐resolution image of the reservoir. In this paper, we discuss the concept of full‐wavefield migration and demonstrate its potential as an imaging tool for vertical seismic profiling data using synthetic examples.

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“…VSP migration algorithms include single-shot record inversion (Harwijanto et al, 1987), depth imaging by wavefield extrapolation (Amundsen, 1993), interferometric migration using extrapolated VSP Green's functions (Xiao and Schuster, 2009), and the use of image point transformation (Cosma et al, 2010), etc. These algorithms can image VSP data well, but the RTM method has its own advantage for complex structures with a strong lateral velocity variation.…”

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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VSP migration by single shot record inversion

Cited by 3 publications

References 0 publications

Migration of wide‐angle seismic reflection data from the Grenville Front in Lake Huron

Migration of wide‐angle seismic reflection data from the Grenville Front in Lake Huron

Full‐wavefield migration of vertical seismic profiling data: using all multiples to extend the illumination area

Reverse time migration of 3D vertical seismic profile data

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