Marchenko imaging

Wapenaar, Kees; Thorbecke, Jan; Neut, Joost van der; Broggini, Filippo; Slob, Evert; Snieder, Roel

doi:10.1190/geo2013-0302.1

Cited by 336 publications

(379 citation statements)

References 49 publications

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“…It has been shown that all events in the Green's functions can be retrieved with correct amplitudes for K → ∞, given that the initial focusing function obeys eq. (24) Slob et al 2014;Wapenaar et al 2014a). In practice, only a few iterations are generally sufficient to predict the dominant internal multiples in the wavefield with fairly accurate amplitudes, as we will demonstrate in the synthetic examples that follow.…”

Section: Green's Function Retrievalmentioning

confidence: 99%

See 1 more Smart Citation

On Green's function retrieval by iterative substitution of the coupled Marchenko equations

Neut¹,

Vasconcelos

Wapenaar³

2015

Geophys. J. Int.

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119

114

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S U M M A R YIterative substitution of the coupled Marchenko equations is a novel methodology to retrieve the Green's functions from a source or receiver array at an acquisition surface to an arbitrary location in an acoustic medium. The methodology requires as input the single-sided reflection response at the acquisition surface and an initial focusing function, being the time-reversed direct wavefield from the acquisition surface to a specified location in the subsurface. We express the iterative scheme that is applied by this methodology explicitly as the successive actions of various linear operators, acting on an initial focusing function. These operators involve multidimensional crosscorrelations with the reflection data and truncations in time. We offer physical interpretations of the multidimensional crosscorrelations by subtracting traveltimes along common ray paths at the stationary points of the underlying integrals. This provides a clear understanding of how individual events are retrieved by the scheme. Our interpretation also exposes some of the scheme's limitations in terms of what can be retrieved in case of a finite recording aperture. Green's function retrieval is only successful if the relevant stationary points are sampled. As a consequence, internal multiples can only be retrieved at a subsurface location with a particular ray parameter if this location is illuminated by the direct wavefield with this specific ray parameter. Several assumptions are required to solve the Marchenko equations. We show that these assumptions are not always satisfied in arbitrary heterogeneous media, which can result in incomplete Green's function retrieval and the emergence of artefacts. Despite these limitations, accurate Green's functions can often be retrieved by the iterative scheme, which is highly relevant for seismic imaging and inversion of internal multiple reflections.

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Section: Green's Function Retrievalmentioning

confidence: 99%

“…also been mentioned by Sheiman (private communication, 2014). During higher-order iterations, the amplitudes of the events are updated, as illustrated by Wapenaar et al (2014a), Broggini et al (2014b) and Slob et al (2014).…”

Section: Step 2: Updating the Downgoing Wavefieldsmentioning

confidence: 99%

On Green's function retrieval by iterative substitution of the coupled Marchenko equations

Neut¹,

Vasconcelos

Wapenaar³

2015

Geophys. J. Int.

Self Cite

119

114

View full text Add to dashboard Cite

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“…They obtained the Green's function of the unknown medium between the virtual source and the surface. A 3D extension of these concepts [12,13] has led to new imaging methodology for single-sided scalar reflection data [14,15].…”

Section: Introductionmentioning

confidence: 99%

Single-sided Marchenko focusing of compressional and shear waves

Wapenaar

2014

Phys. Rev. E

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In time-reversal acoustics, waves recorded at the boundary of a strongly scattering medium are sent back into the medium to focus at the original source position. This requires that the medium can be accessed from all sides. We discuss a focusing method for media that can be accessed from one side only. We show how complex focusing functions, emitted from the top surface into the medium, cause independent foci for compressional and shear waves. The focused fields are isotropic and act as independent virtual sources for these wave types inside the medium. We foresee important applications in nondestructive testing of construction materials and seismological monitoring of processes inside the Earth.

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“…Marchenko imaging (Broggini and Snieder, 2012;Slob et al, 2014;Wapenaar et al, 2014) is a novel seismic imaging technique that has the potential to produce seismic reflection images, free of artifacts related to internal multiples van der Neut et al, 2015;Ravasi et al, 2016) and surface-related multiples (Singh et al, 2017). An intriguing question is whether the multiples are only eliminated or whether they also contribute to the imaged reflectors.…”

Section: Introductionmentioning

confidence: 99%

On the role of multiples in Marchenko imaging

2017

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Marchenko imaging can produce seismic reflection images in which artifacts related to multiples are suppressed. However, in state-of-the-art implementations, multiples do not contribute to the imaged reflectors. With an “event-by-event” deconvolution imaging approach, it is possible to use multiples in Marchenko imaging. We illustrate this for a 1D reflection response in which the primary reflection of a specific interface is missing.

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Marchenko imaging

Cited by 336 publications

References 49 publications

On Green's function retrieval by iterative substitution of the coupled Marchenko equations

On Green's function retrieval by iterative substitution of the coupled Marchenko equations

Single-sided Marchenko focusing of compressional and shear waves

On the role of multiples in Marchenko imaging

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