Sonal Singh

Delhi Technological University

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Manika Khanuja

Jamia Millia Islamia

Rishabh Sharma

Amity University

Nidhi Shukla

REVA University

Arun Kumar

Jamia Millia Islamia

Kuldip Dwivedi

P. J. Barton

University of Cambridge

Jitendra Kumar Pandey

University of Petroleum and Energy Studies

Shashank Gupta

Amsterdam University of the Arts

S. M. Shivaprasad

Jawaharlal Nehru Centre for Advanced Scientific Research

B. R. Mehta

Indian Institute of Technology Delhi

Cooperative Institutions

Indian Institute of Technology Delhi

Friedrich-Alexander-Universität Erlangen-Nürnberg

Jamia Millia Islamia

University of Petroleum and Energy Studies

Indian Institute of Technology Indore

Total (France)

Institut de physique du globe de Paris

University of Cambridge

Amity University

CSIR National Physical Laboratory of India

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Visible light induced bactericidal and photocatalytic activity of hydrothermally synthesized BiVO 4 nano-octahedrals

Journal of Photochemistry and Photobiology B Biology (2016)

Rishabh Sharma Uma Sonal Singh Ajit Kumar Verma Manika Khanuja

Bismuth vanadate

Monoclinic crystal system

Methylene blue

Visible spectrum

10.1016/j.jphotobiol.2016.06.035

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Citations (82)

Time-lapse Waveform Inversion for a Compacting Reservoir

Proceedings (2013)

Yili Zheng P. J. Barton Sonal Singh

For time-lapse imaging, full waveform inversion (FWI) can be used as a powerful tool to resolve high resolution velocity changes in the subsurface. In the past, the application of FWI for time-lapse analysis mostly has been limited in a non-compacting reservoir setting in which the time-lapse responses are assumed to be localized in a small region. In this study, FWI is used to investigate the time-lapse problem for a compacting reservoir in which physical parameters in regions other than the reservoir change as a result of production-induced changes in the reservoir. A synthetic test is designed to demonstrate FWI’s ability to image velocity changes in the reservoir as well as with variations in the overburden. For the real case study, ocean bottom cable data from the Valhall field are used for inversion. Time-lapse FWI are performed using the conventional approach that inverts each vintage of time-lapse data independently; and the residual time-lapse waveform inversion (RTWI) method that inverts the observed data difference instead. Inversion results show that the RTWI method is out-performed by the conventional method in the presence of noise.

Overburden

Environmental geology

10.3997/2214-4609.20130300

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Citations (1)

Time-lapse Elastic 3D Full Waveform Inversion Using Grid Injection Method

Proceedings (2013)

Sonal Singh Dmitry Borisov

Full waveform inversion (FWI) is a powerful tool to quantify Earth properties of the subsurface from seismic data, and has become a major area of research. Because of very high computational cost, FWI has so far been used for either 2D full elastic or 3D acoustic media. Here we propose an efficient way to perform time-lapse elastic FWI in 3D using grid injection method, which allows for efficient calculation of synthetic seismograms after model alterations within a localized area. The technique allows for significant reductions in computational time and memory requirements without noticeable losses in accuracy.

Seismogram

10.3997/2214-4609.20130299

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Concentration specific and tunable photoresponse of bismuth vanadate functionalized hexagonal ZnO nanocrystals based photoanodes for photoelectrochemical application

Solid State Sciences (2017)

Sonal Singh Aakansha Ruhela Sanju Rani Manika Khanuja Rishabh Sharma

Photocurrent

Wurtzite crystal structure

Bismuth vanadate

Monoclinic crystal system

Nanocrystalline material

10.1016/j.solidstatesciences.2017.12.003

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Citations (25)

Pressure Versus Vertical Velocity Full-Waveform Inversion of Wide-Angle, Ocean-Bottom Node Data from the North Sea

81st EAGE Conference and Exhibition 2019 (2019)

Aline Robin Sonal Singh Mark Noble Paul Williamson

Summary For the characterisation of both hydrocarbon reservoirs and the surrounding geology, a depth model of the subsurface quantifying the elastic parameters is a desirable product. Full-waveform inversion (FWI) is an iterative approach that updates such initial model by minimising the misfit between real and modelled seismic data. Multicomponent ocean-bottom acquisitions are showing useful specificities in various domains of seismic imaging. In this paper, we compare on a real case (Alwyn North Field, UK, North Sea), pressure and vertical velocity components, when inverting for P-wave velocities with FWI, using large-angle, ocean-bottom data in a shallow-water environment. Vz component did not prove to be more useful than P component, as one could expect from its lower content in water-layer reverberations. P component might even be more useful since it led to a slightly more continuous model and since, unlike Vz component, its good S/N ratio allowed the estimation of a source. Better low frequencies from Vz component might allow us to make better use of Vz specificities.

Ocean bottom

North sea

Component (thermodynamics)

10.3997/2214-4609.201900992

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Wastewater Management and Urban Water Sustainability

M.L. Soni Sonal Singh Shashank Gupta Kuldip Dwivedi Nidhi Shukla

10.1007/978-981-96-1140-9_4

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Enhanced surface area, high Zn interstitial defects and band gap reduction in N-doped ZnO nanosheets coupled with BiVO 4 leads to improved photocatalytic performance

Applied Surface Science (2017)

Sonal Singh Rishabh Sharma B. R. Mehta

Nanosheet

Visible spectrum

Charge carrier

10.1016/j.apsusc.2017.03.189

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Citations (70)

Bi2O3/Ni-Bi2O3 system obtained via Ni-doping for enhanced PEC and photocatalytic activity supported by DFT and experimental study

Solar Energy Materials and Solar Cells (2018)

Sonal Singh Rishabh Sharma

Bismuth

10.1016/j.solmat.2018.06.049

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Citations (62)

Elastic Parameter Estimation from the 2D Waveform Inversion of a Look-Ahead Walk-Away VSP Survey

75th EAGE Conference and Exhibition incorporating SPE EUROPEC 2013 (2006)

Mark Roberts Sonal Singh

Pore pressure in sediments beneath salt in the Gulf of Mexico varies widely creating a potentially dangerous and difficult drilling challenge. The elastic parameters are key to identifying many attributes, but in this paper the elastic parameters are being estimated with the aim of predicting the pore pressure in the sedimentary layer immediately below the salt. The elastic parameters have previously been estimated using an AVO type approach. In this paper we investigate the ability of full waveform inversion to estimate the P-wave and S-wave velocity models from a walk-away VSP in the context of a salt dome. Results demonstrate the ability to further localize the position of the bottom of the salt and extract velocity information beneath the salt.

Salt dome

Position (finance)

10.3997/2214-4609.201402089

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Waveform Inversion of Vertical Seismic Profile

Janping Ying Akio Sakai Sonal Singh

Vertical seismic profile

10.3997/2214-4609-pdb.28.d48

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Citations (3)