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El Marhfoul, B. (author), Verschuur, D.J. (author)3D borehole-related seismic data can provide us with accurate velocity models and high-resolution images. However, conventional imaging algorithms that assume primary reflection energy will cover only a limited areaaround the borehole. This illumination problem can be overcome by including surface-related and internal multiples in the imaging...conference paper 2017
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Augmented Full Wavefield Modeling - An Iterative Directional Modeling Scheme for Inhomogeneous MediaHammad, H.I.A. (author), Verschuur, D.J. (author)We derive a representation theorem for modeling directional wavefields using reciprocity theorem of the convolution-type. A Neumann series expansion of the representation yields a series that is similar to that of Bremmer. A generalized Neumann series is also derived similar to that used for solving the non-directional Lippmann-Schwinger...conference paper 2017
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Verschuur, Jasper (author), Kolen, B. (author), van Veelen, P.C. (author)To help decision makers in delta areas to select appropriate adaptation and mitigation strategies it is necessary to have a clear picture of the main drivers of risk and how risk evolves under changing conditions. Acknowledging these problems, the Delta Alliance and the TU Delft took the initiative to develop a new index that helps cities to...report 2017
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Sun, Yimin (author), Verschuur, D.J. (author), Luo, Yi (author)Near-surface problem is a common challenge faced by land seismic data processing, where often, due to near-surface anomalies, events of interest are obscured. One method to handle this challenge is near-surface layer replacement, which is a wavefield reconstruction process based on downward wavefield extrapolation with the near-surface...journal article 2017
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Garg, A. (author), Verschuur, D.J. (author)Estimating the reservoir properties from surface seismic data for a target below a complex overburden is a challenging problem. One of the approaches is to apply reservoir-oriented local inversion schemes on the redatumed local reflection response. In this paper, we propose a process to estimate the reservoir impulse responses (redatumed...conference paper 2017
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Kontakis, A. (author), Verschuur, D.J. (author)Although theoretically straightforward, adapting focal deblending to realistic 5D acquisition scenarios can be challenging in practice. The two main issues that have to be dealt with are insufficiently sampled spatial dimensions and the computational effort needed for the deblending inversion. In order to deal with both issues, we propose...conference paper 2017
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Ishiyama, T. (author), Blacquière, G. (author), Verschuur, D.J. (author), Mulder, W.A. (author)Surface waves in seismic data are often dominant in a land or shallow-water environment. Separating them from primaries is of great importance either for removing them as noise for reservoir imaging and characterization or for extracting them as signal for near-surface characterization. However, their complex properties make the surface-wave...journal article 2016
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Kutscha, H. (author), Verschuur, D.J. (author)In many cases, seismic measurements are coarsely sampled in at least one dimension. This leads to aliasing artefacts and therefore to problems in the subsequent processing steps. To avoid this, seismic data reconstruction can be applied in advance. The success and reliability of reconstruction methods are dependent on the assumptions they make...journal article 2016
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Kontakis, A. (author), Wu, S. (author), Verschuur, D.J. (author)The applicability of a deblending method is directly related to acquisition parameters, such as source and detector locations. We formulate focal deblending in two alternative ways. In the first case, the double focal transform is used, which relies on a well-sampled source and detector dimension. In the second case, the single-sided focal...conference paper 2016
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Lopez Angarita, G.A. (author), Verschuur, D.J. (author)Surface-related multiple elimination (SRME) is one of the most commonly used methods for suppressing surface multiples. However, to obtain an accurate surface multiple estimation, dense source and receiver sampling is required. The traditional approach to this problem is performing data interpolation prior to multiple estimation. Although...journal article 2015
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Soni, A.K. (author), Verschuur, D.J. (author)For vertical-seismic-profiling (VSP) measurements, the use of blended acquisition, with time-overlapping shot records, can greatly reduce the downtime and, thereby, provide large cost savings. For directly imaging blended VSP measurements, we have used full-wavefield migration (FWM). FWM is an inversion-based imaging scheme that enables us to...journal article 2015
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Ishiyama, T. (author), Blacquiere, G. (author), Verschuur, D.J. (author)Surface-waves are often dominant in seismic data in a shallow water and land environment. Separating them out from the seismic data is of great importance for either removing them as noise for reservoir characterization, or extracting them as signal for near-surface characterization. However, their complex properties make the surface-wave...conference paper 2014
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Kumar, A. (author), Blacquiere, G. (author), Verschuur, D.J. (author)Recent advances in survey design have led to conventional common-midpoint-based analysis being replaced by the subsurface-based seismic acquisition analysis and design, with the emphasis on advance techniques of illumination analysis. Amongst them are wave-equation-based seismic illumination analyses such as the so-called focal beam method. The...conference paper 2014
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Verschuur, D.J. (author)It is often said that one geophysicist's noise is another's data, but today it seems that it has never been more the case. Features of seismic records that once were considered noise are now routinely used to aid in imaging the Earth's interior and in deriving rock properties. Sacrosanct noise such as surface waves is now inverted to derive near...journal article 2014
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Davydenko, M. (author), Verschuur, D.J. (author)Full wavefield migration (FWM) is an inversion-based imaging algorithm that utilizes the complete reflection measurements: primaries as well as all multiples, both surface and internal. Using multiples in the imaging can extend the illumination of the subsurface. In this paper we concentrate the study on the internal scattering that can be...journal article 2013
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Lopez, G.A. (author), Verschuur, D.J. (author)Recently, a new approach to multiple removal has been intro- duced: estimation of primaries by sparse inversion (EPSI). Al- though based on the same relationship between primaries and multiples as surface-related multiple elimination (SRME), it involves quite a different process: instead of prediction and subtraction of multiples, in EPSI the...journal article 2013
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Soni, A.K. (author), Verschuur, D.J. (author)Blended source and/or simultaneous source acquisition for multi-offset and multi-azimuth VSP measurements can prove significantly beneficial in saving expensive borehole down-time. In the last few years, for the case of surface seismic data, it was proposed to redefine imaging and inversion of the blended data to handle the data directly without...journal article 2013
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Verschuur, D.J. (author)Today, the problem of surface-related multiples, especially in shallow water, is not fully solved. Although surface-related multiple elimination (SRME) method has proved to be successful on a large number of data cases, the involved adaptive subtraction acts as a weak link in this methodology, where primaries can be distorted due to their...journal article 2013
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Berkhout, A.J. (author), Verschuur, D.J. (author)The next generation migration technology considers multiple scattering as vital information, allowing the industry to generate significantly better images of the subsurface. The proposed full wavefield algorithm (FWM) makes use of two-way wave theory that is formulated in terms of one-way wavefields. We show that the current migration algorithms...conference paper 2012
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Doulgeris, P. (author), Verschuur, D.J. (author), Blacquiere, G. (author)Blended surveys have recently appeared in production environments. This underlines the need for processing tools that will either process the recorded data directly or perform the separation into single source data (deblending). An inversion technique for the separation of such data is described here. The problem parameterization utilises the...conference paper 2012