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Localizing microseismic events on field data using a U-Net based convolutional neural network trained on synthetic data

Vinard, N. (author), Drijkoningen, G.G. (author), Verschuur, D.J. (author)

Hydraulic fracturing plays an important role when it comes to the extraction of resources in unconventional reservoirs. The microseismic activity arising during hydraulic fracturing operations needs to be monitored to both improve productivity and to make decisions about mitigation measures. Recently, deep learning methods have been investigated...

journal article 2021

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Seismic inversion with deep learning: A proposal for litho-type classification

Pintea, S. (author), Sharma, S. (author), Vossepoel, F.C. (author), van Gemert, J.C. (author), Loog, M. (author), Verschuur, D.J. (author)

This article investigates bypassing the inversion steps involved in a standard litho-type classification pipeline and performing the litho-type classification directly from imaged seismic data. We consider a set of deep learning methods that map the seismic data directly into litho-type classes, trained on two variants of synthetic seismic data:...

journal article 2021

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Marchenko multiple elimination and full-wavefield migration in a resonant pinch-out model

Slob, E.C. (author), Zhang, L. (author), Verschuur, D.J. (author)

Marchenko multiple elimination schemes are able to attenuate all internal multiple reflections in acoustic reflection data. These can be implemented with and without compensation for two-way transmission effects in the resulting primary reflection data set. The methods are fully automated and run without human intervention, but they require the...

journal article 2021

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Full wavefield least squares reverse time migration

Davydenko, M.V. (author), Verschuur, D.J. (author)

Waveform inversion based on least-squares reverse time migration (LSRTM) usually involves Born modeling, which models the primary-only data. As a result the inversion process handles only primaries and corresponding multiple elimination pre-processing of the input data is required prior to imaging and inversion. Otherwise, multiples left in...

journal article 2021

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Automated seismic acquisition geometry design for optimized illumination at the target: a linearized approach

Wu, S. (author), Verschuur, D.J. (author), Blacquière, G. (author)

In seismic exploration methods, imperfect spatial sampling at the surface causes a lack of illumination at the target in the subsurface. The hampered image quality at the target area of interest causes uncertainties in reservoir monitoring and production, which can have a substantial economic impact. Especially in the case of a complex...

journal article 2021

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From surface seismic data to reservoir elastic parameters using a full-wavefield redatuming approach

Garg, A. (author), Verschuur, D.J. (author)

Traditionally, reservoir elastic parameters inversion suffers from the overburden multiple scattering and transmission imprint in the local input data used for the target-oriented inversion. In this paper, we present a full-wavefield approach, called reservoir-oriented joint migration inversion (JMI-res), to estimate the high-resolution...

journal article 2020

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Teaching a hands-on course during corona lockdown: from problems to opportunities

Hut, R.W. (author), Pols, C.F.J. (author), Verschuur, D.J. (author)

Teaching a hands- and minds-on course, in which feedback is essential in order to learn, is difficult, especially in times of COVID-19 where student progression cannot be monitored directly. During the lockdown period, the workshops of an undergraduate Design Engineering course had to be transferred to the home situation, which required a...

journal article 2020

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Implications of ambiguity in Antarctic ice sheet dynamics for future coastal erosion estimates: a probabilistic assessment

Verschuur, Jasper (author), Le Bars, Dewi (author), Katsman, C.A. (author), de Vries, S. (author), Ranasinghe, Roshanka (author), Drijfhout, Sybren S. (author), Aarninkhof, S.G.J. (author)

Sea-level rise (SLR) can amplify the episodic erosion from storms and drive chronic erosion on sandy shorelines, threatening many coastal communities. One of the major uncertainties in SLR projections is the potential rapid disintegration of large fractions of the Antarctic ice sheet (AIS). Quantifying this uncertainty is essential to support...

journal article 2020

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Ultrasound imaging of the brain using full-waveform inversion

Taskin, U. (author), Solberg Eikrem, Kjersti (author), Naevdal, Geir (author), Jakobsen, Morten (author), Verschuur, D.J. (author), van Dongen, K.W.A. (author)

Transcranial ultrasound has been used to image the brain since 1942. Currently, it is regaining interest and full-waveform inversion (FWI) methods are now employed to reconstruct speed-of-sound profiles of the brain. Many of these methods require a good starting model. Here, we test the applicability of contrast source inversion (CSI) as a...

conference paper 2020

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Imaging with surface-related multiples to overcome large acquisition gaps

Nath, A. (author), Verschuur, D.J. (author)

To get the best result for seismic imaging using primary reflections, data with densely-spaced sources and receivers are ideally preferred. However, dense acquisition can sometimes be hindered by various obstacles, like platforms or complex topography. Such areas with large data gaps may deter exploration or monitoring, as conventional...

journal article 2020

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Joint migration inversion: Features and challenges

Sun, Yimin (author), Kim, Young Seo (author), Qu, S. (author), Verschuur, D.J. (author)

Joint migration inversion is a recently proposed technology, accommodating velocity model building and seismic migration in one integrated process. Different from the widely accepted full waveform inversion technology, it uses imaging parameters, i.e. velocities and reflectivities of the subsurface, to parameterize its solution space. The...

journal article 2020

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Automatic high-resolution microseismic event detection via supervised machine learning

Qu, S. (author), Guan, Zhe (author), Verschuur, D.J. (author), Chen, Yangkang (author)

Microseismic methods are crucial for real-Time monitoring of the hydraulic fracturing dynamic status during the development of unconventional reservoirs. However, unlike the active-source seismic events, the microseismic events usually have low signal-To-noise ratio (SNR), which makes its data processing challenging. To overcome the noise...

journal article 2020

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Seismic inversion of soil damping and stiffness using multichannel analysis of surface wave measurements in the marine environment

Armstrong, Michael (author), Ravasio, Matteo (author), Versteijlen, W.G. (author), Verschuur, D.J. (author), Metrikine, A. (author), van Dalen, K.N. (author)

Determination of soil material damping is known to be difficult and uncertain, especially in the offshore environment. Using an advanced inversion methodology based on multichannel spectral analysis, Scholte and Love wave measurements are used to characterize subsea soil from a North Sea site. After normalization, a determinant-based objective...

journal article 2020

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Spatial aliasing removal using deep learning super-resolution

Garg, A. (author), Vos, A. (author), Bortych, N. (author), Gupta, D. K. (author), Verschuur, D.J. (author)

journal article 2019

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Virtual acoustics in inhomogeneous media with single-sided access

Wapenaar, C.P.A. (author), Brackenhoff, J.A. (author), Thorbecke, J.W. (author), van der Neut, J.R. (author), Slob, E.C. (author), Verschuur, D.J. (author)

A virtual acoustic source inside a medium can be created by emitting a time-reversed point-source response from the enclosing boundary into the medium. However, in many practical situations the medium can be accessed from one side only. In those cases the time-reversal approach is not exact. Here, we demonstrate the experimental design and...

journal article 2018

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Three-dimensional receiver deghosting of seismic streamer data using L1 inversion and redundant extended radon dictionary

Sun, Yimin (author), Verschuur, D.J. (author)

In this paper, we propose a novel three-dimensional receiver deghosting algorithm that is capable of deghosting both horizontal and slanted streamer data in a theoretically consistent manner. Our algorithm honours wave propagation phenomena in a true three-dimensional sense and frames the three-dimensional receiver deghosting problem as a Lasso...

journal article 2018

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Least-squares migration using surface-related multiples on data with large acquisition gaps

Verschuur, D.J. (author), Nath, A. (author)

Seismic acquisition in an area can often get hindered by reasons such as complex topography, infrastructure (e.g. platforms) or lack of access due to legal and environmental reasons. Such areas with possibilities of large data gaps may deter exploration or monitoring, as the conventional imaging strategies would either provide bad seismic images...

conference paper 2018

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Full waveform inversion and joint migration inversion with an automatic directional total variation constraint

Qu, S. (author), Verschuur, D.J. (author), Chen, Yangkang (author)

As full waveform inversion (FWI) is a non-unique and typically ill-posed inversion problem, it needs proper regularization to avoid cycle-skipping. To reduce the non-linearity of FWI, Joint Migration Inversion (JMI) is proposed as an alternative, explaining the reflection data with decoupled velocity and reflectivity parameters. However, the...

journal article 2018

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Robust estimation of VTI ( vertical symmetry axis) models via joint migration inversion: Including multiples in anisotropic parameter estimation

Verschuur, D.J. (author), Alshuhail, A.A. (author)

Since the Earth is predominately anisotropic, the anisotropy of the medium needs to be included in seismic imaging to avoid mispositioning of reflectors and unfocused images. Deriving accurate anisotropic velocities from the seismic reflection measurements is a highly nonlinear and ambiguous process. To mitigate the nonlinearity and trade-offs...

journal article 2018

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Integrated receiver deghosting and closed-loop surface-multiple elimination

Vrolijk, J. (author), Verschuur, D.J. (author), Lopez Angarita, G.A. (author)

Accurate surface-related multiple removal is an important step in conventional seismic processing, and more recently, primaries and surface multiples are separated such that each of them is available for imaging algorithms. Current developments in the field of surface-multiple removal aim at estimating primaries in a large-scale inversion...

journal article 2017