Target-oriented Marchenko imaging of a North Sea field

Ravasi, Matteo; Vasconcelos, Ivan; Kritski, A.; Curtis, Andrew; Filho, Carlos Alberto da Costa; Meles, Giovanni Angelo

doi:10.1093/gji/ggv528

Cited by 112 publications

(83 citation statements)

References 21 publications

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“…More importantly, we would like to achieve this using subsurface models that are no more complex than those used in conventional migration. A key enabler for our objective is the novel approach of Marchenko redatuming (Wapenaar et al, 2014; van der Neut et al, 2015;Ravasi et al, 2016): it allows us to obtain, from surface reflection data, subsurface redatumed waves that correctly handle internal multiples, while using conventional migration models. Combining this with the concepts of target-enclosing interferometry (van der Neut et al, 2013) and Reflectivity-based extended images (Vasconcelos et al, 2010;Thomson et al, 2016) we propose the new Target-Enclosing Extended Images.…”

Section: Discussionmentioning

confidence: 99%

“…In this paper, we use the same 2D OBC data set from the Volve field, North Sea, as do Ravasi et al (2016). For details on the data pre-processing, and more importantly for a discussion on the results of Marchenko redatuming using those data, we refer the reader to Ravasi et al (2016): here we rely on the results of that study as the input data to retrieve the TEEI responses.…”

Section: North Sea Field Data Examplementioning

confidence: 99%

“…For details on the data pre-processing, and more importantly for a discussion on the results of Marchenko redatuming using those data, we refer the reader to Ravasi et al (2016): here we rely on the results of that study as the input data to retrieve the TEEI responses. Da Costa Filho et al (2017) present alternative Marchenko-based imaging approaches using these same data.…”

Section: North Sea Field Data Examplementioning

confidence: 99%

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Retrieving Reservoir-only Reflection and Transmission Responses from Target-enclosing Extended Images

Vasconcelos¹,

Ravasi²,

Neut³

et al. 2017

Proceedings

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Vasconcelos, I.; Ravasi, M.; van der Neut, Joost; Kritski, A.; Cui, T. Important noteTo cite this publication, please use the final published version (if applicable). Please check the document version above. CopyrightOther than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons. Takedown policyPlease contact us and provide details if you believe this document breaches copyrights. We will remove access to the work immediately and investigate your claim. This work is downloaded from Delft University of Technology. For technical reasons the number of authors shown on this cover page is limited to a maximum of 10. Retrieving reservoir-only reflection and transmission responses from target-enclosing extended images SummaryThe Marchenko redatuming approach reconstructs wavefields at depth that contain not only primary reflections, but also multiply-scattered waves. While such fields in principle contain additional subsurface information, conventional imaging approaches cannot tap into the information encoded in internal multiples in a trivial manner. We discuss a new approach that uses the full information contained in Marchenko-redatumed fields, whose output are local reflection and transmission responses that fully enclose a target volume at depth, without contributions from over-or underburden structures. To obtain the Target-Enclosing Extended Images (TEEIs) we solve a multidimensional deconvolution (MDD) problem that can be severely ill-posed, so we offer stable estimates to the MDD problem that rely on the physics of the Marchenko scheme. We validate our method on ocean-bottom field data from the North Sea. In our field data example, we show that the TEEIs can be used for reservoir-targeted imaging using reflection and, for the first time, local transmission responses, shown to be internal multiples retrieved by the redatuming scheme. Finally, we present local, TEEI-derived reflection and transmission images of the target volume at depth that are structurally consistent with a benchmark image from conventional migration of surface data. 2214-4609.201701222 Introduction With the goal of achieving increased imaging resolution of reservoirs at depth and better quantitative reservoir characterisation, here we aim at retrieving the local reflection and transmission responses of a target volume at depth from surface seismic data, with no influence of over-or underburden geology. More importantly, we would like to achieve this using subsurface models that are no more complex than those used in conventional migration. A key enabler for our objective is the novel approach of Marchenko redatuming (Wapenaar et al., 2014; van der Neut et al., 2015;Ravasi et al., 2016): it allows us to obtain, from surface reflection data, subsurface redatumed waves that correctly handle internal multiples, while using conventional migration mode...

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Section: Discussionmentioning

confidence: 99%

Section: North Sea Field Data Examplementioning

confidence: 99%

Section: North Sea Field Data Examplementioning

confidence: 99%

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Retrieving Reservoir-only Reflection and Transmission Responses from Target-enclosing Extended Images

Vasconcelos¹,

Ravasi²,

Neut³

et al. 2017

Proceedings

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“…from below (Ravasi et al, 2016). If we choose the upper boundary below the earth's surface, equations 22 and 23 are no longer valid.…”

Section: Inversion Of the Focusing Function Representationsmentioning

confidence: 99%

Target-enclosed seismic imaging

et al. 2017

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Seismic reflection data can be redatumed to a specified boundary in the subsurface by solving an inverse (or multidimensional deconvolution) problem. The redatumed data can be interpreted as an extended image of the subsurface at the redatuming boundary, depending on the subsurface offset and time. We retrieve target-enclosed extended images by using two redatuming boundaries, which are selected above and below a specified target volume. As input, we require the upgoing and downgoing wavefields at both redatuming boundaries due to impulsive sources at the earth’s surface. These wavefields can be obtained from actual measurements in the subsurface, they can be numerically modeled, or they can be retrieved by solving a multidimensional Marchenko equation. As output, we retrieved virtual reflection and transmission responses as if sources and receivers were located at the two target-enclosing boundaries. These data contain all orders of reflections inside the target volume but exclude all interactions with the part of the medium outside this volume. The retrieved reflection responses can be used to image the target volume from above or from below. We found that the images from above and below are similar (given that the Marchenko equation is used for wavefield retrieval). If a model with sharp boundaries in the target volume is available, the redatumed data can also be used for two-sided imaging, where the retrieved reflection and transmission responses are exploited. Because multiple reflections are used by this strategy, seismic resolution can be improved significantly. Because target-enclosed extended images are independent on the part of the medium outside the target volume, our methodology is also beneficial to reduce the computational burden of localized inversion, which can now be applied inside the target volume only, without suffering from interactions with other parts of the medium.

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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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Target-oriented Marchenko imaging of a North Sea field

Cited by 112 publications

References 21 publications

Retrieving Reservoir-only Reflection and Transmission Responses from Target-enclosing Extended Images

Retrieving Reservoir-only Reflection and Transmission Responses from Target-enclosing Extended Images

Target-enclosed seismic imaging

On the role of multiples in Marchenko imaging

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