Delphi Team

Dirk J. (Eric) Verschuur

Dirk J. (Eric) Verschuur

Dirk J. (Eric) Verschuur was born in Alphen aan den Rijn, The Netherlands in 1964. He received his M.Sc. degree in 1986 and his Ph. D degree (honors) in 1991 from the Delft University of Technology (DUT), both in applied physics. From 1992 - 1997 he worked under a senior research fellowship from the Royal Dutch Academy of Art and Sciences (KNAW). In 1997 he became assistant professor and since 1999 he is an associate professor at the DUT at the laboratory of Acoustical Imaging and Sound Control. He is the project leader of the DELPHI research consortium on Multiple Removal and Structural Imaging, within which research is carried out for the oil and gas industry in the area of seismic exploration. His main interests are seismic modeling, data processing and imaging techniques. In 1997 he received SEG’s J. Clarence Karcher award and in 2006 he was awarded with the Virgil Kauffman Gold medal from the SEG.

Gerrit Blacquière

Gerrit Blacquière

Gerrit Blacquière was born in Zwijndrecht, The Netherlands in 1960. He received his M.Sc. degree in 1985 and his Ph. D degree in 1989 from Delft University of Technology (DUT), both in applied physics. From 1989 to 1993 he worked with Delft Geophysical (currently part of WesternGeco) where he developed depth migration algorithms. He was also involved in a research project focused on the ‘next generation’ seismic acquisition system. In 1993 he joined the Dutch research institute TNO, where he had several management positions related to Research & Development. In 2006 he became an associated professor at Delft University of Technology in the Earth Sciences department (20% appointment). He is the project leader of the DELPHI research consortium on Acquisition and Preprocessing, where research is carried out for the oil and gas industry in the area of seismic acquisition. An important facility that supports this research is the EFI (experimental facility for imaging) for the physical modeling of seismic data on a small scale. His main interests are seismic modeling, acquisition, and (pre)processing techniques.

Guus Berkhout

Guus Berkhout

Professor Guus Berkhout started his career with Shell in 1964, where he held several international positions in R&D and technology transfer. In 1976 he accepted a Chair at Delft University of Technology in the field of acoustical and geophysical imaging. During 1998 – 2001, he has been a member of the University Board, being responsible for scientific research and intellectual property. In 2001 he also accepted a Chair in the field of innovation management.Guus Berkhout is a member of the Royal Netherlands Academy of Arts and Sciences (KNAW) and the Netherlands Academy of Engineering (AcTI).

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Femke Vossepoel

Femke Vossepoel

Femke Vossepoel received her Msc degree in 1995 and PhD degree in 1999 from Delft University of Technology (DUT), both in Aerospace Engineering. She received a Fulbright Fellowship for oceanographic research at the University of Maryland and the National Oceanic and Atmospheric Administration in Washington DC, USA. From 2000 to 2002, she received an individual Marie Curie Fellowship as a post-doc at Université Pierre et Marie Curie in Paris, France. This was followed by a five year position at Utrecht University. Femke obtained industry experience in the period 2007-2016 while working for Shell Exploration and Production. Her main interests are data assimilation, joint inversion of seismic and non-seismic data, and reservoir surveillance.

Stefan M. Luthi

Stefan M. Luthi

Stefan M. Luthi (1950) is professor in production geology and head of the section Applied Geology at the Delft University of Technology. He is also a senior technical advisor to Schlumberger Limited. A native of Switzerland, he received his M.Sc. in 1974 at the ETH Zurich with a thesis entitled "The Geology of the Monte Nudo, Prov. Varese, Italy", under supervision of Profs. R. Trümpy and D. Bernoulli. In 1974/1975 he worked as a production geologist for OSCO in Ahwaz in Iran. In 1978 he received a Ph.D. from the ETH Zurich for a thesis entitled "On the Mechanics of Turbidity Currents", supervised by Prof. K. Hsu and T. Dracos. After some post-doc and consulting work, he joined Schlumberger Oilfield Services in 1982 as a regional geologist for the Middle East, based in Dubai. He then was transferred to the Schlumberger-Doll Research Center in Ridgefield, CT (USA), where he spent ten years as a senior research scientist and program manager. In 1991/1992 he was invited for one year as a visiting professor to the department of geophysics at the Universidade Federal do Pará in Belém, Brazil. In 1996, Stefan was transferred by Schlumberger to Paris as chief geologist for Europe, Africa and CIS, and in 1998 he was transferred to Luanda, Angola, as interpretation manager for Africa. In 1999 he accepted his present position at the Delft University of Technology. His specializations are reservoir characterization using new quantitative approaches, sedimentology, petrophysics, and reservoir management. He wrote over 50 papers in scientific journals and one textbook. Among the PhD students he currently supervises are also two students sponsored by the Delphi consortium who work on geologically guided full waveform inversion. He is a member of many international societies (AAPGP, EAGE, EGU, SPWLA etc.), member of the Koninklijke Hollandsche Maatschappij der Wetenschappen and Dutch delegate to the International Continental Scientific Drilling Programme. 

Tristan van Leeuwen

Tristan van Leeuwen

Tristan van Leeuwen was born in 1981 in the Netherlands. He received his BSc. and MSc. in Computational Science from Utrecht University in the Netherlands. He obtained his PhD. in geophysics at Delft University in 2010. After spending some time as a postdoctoral researcher at the University of British Columbia in Vancouver, Canada and the Centrum Wiskunde & Informatica in Amsterdam, the Netherlands, he returned to Utrecht University in 2014 as an assistant professor at the mathematical institute. In 2015 he received the SIAM Geosciences Junior Scientist Award. His research interests include: inverse problems, computational imaging, tomography and numerical optimization.

Dries Gisolf

Dries Gisolf

Dries Gisolf obtained his MSc from Delft University of Technology and his PhD from the University of Utrecht, The Netherlands. He worked with Shell International as a geophysicist, involved in acquisition, processing and quantitative interpretation of seismic data for 24 years. During this period he held positions at various locations around the globe, including Europe, the Middle East, the Far East, Africa and Australia. Dries Gisolf has been professor of the Laboratory of Acoustical Imaging and Sound Control at Delft University of Technology, The Netherlands until his retirement in 2010. During this period, he has been active within Delphi as C&M Project leader. After that he co-founded Delft Inversion and is still involved in supervision of Delphi Ph.D. students in the field of full waveform reservoir inversion.

Mikhail Davydenko

Mikhail Davydenko

Mikhail Davydenko was born in 1988 in Novosibirsk, Russia. During 2005-2011 he studied in the Geology and Geophysics Department of the Novosibirsk State University. Both BSc (2009) and MSc (2011) degree were obtained during his internship in the Institute of Petroleum Geology and Geophysics (Siberian Branch of Russian Academy of Sciences). Mikhail’s Master thesis was a continuation of his BSc topic called “Parametrical VSP wavefield separation in time-domain”. Mikhail is currently a PhD student of the Delft University of Technology and joined the DELPHI consortium in September 2011. The current research is based on migration of internal multiples and supervised by Dr. D.J.(Eric) Verschuur.

Apostolos Kontakis

Apostolos Kontakis

Apostolos Kontakis was born in 1984, in Athens, Greece. He received his diploma in Computer Engineering and Informatics in 2008 from the University of Patras, Greece. In 2013 he received his M.Sc. degree in Electrical Engineering from the Delft University of Technology. His M.Sc. thesis topic was on filtering non-uniformly sampled seismic data and was carried out as an internship at Shell Global Solutions International B.V.

Since June 2013 Apostolos has joined DELPHI as a Ph.D. candidate under the supervision of Dr. D. J. Verschuur. His main research topics are seismic data reconstruction and deblending.

Bouchaib El Marhfoul

Bouchaib El Marhfoul

Bouchaib El Marhfoul was born in Casa Blanca (Morocco). He received both B.Sc. and M.Sc. degrees in applied physics from TU Delft. During his M.Sc. project, he developed a 3D algorithm to resolve the complex near surface effects in seismic data, using the CFP technology. After his graduation he worked for more than two years as a research assistant within the DELPHI consortium where he was involved in deferent projects concerning seismic data processing and dealing with issues like near surface problems, multiples estimation/removal and pre-stack depth migration. In 2008, he joined Saudi Aramco in Dhahran (Saudi Arabia) as a geophysicist. His main task was developing and implementing of new technologies to produce algorithms and software modules that are used in seismic data processing for both imaging and inversion purposes. Examples of projects that he worked on are: wave equation algorithms for surface seismic as well as 3D VSP data, diffraction imaging of 3D seismic data and pre-stack elastic inversion. In October 2013, he joined the the DELPHI Consortium on a part-time basis to pursue his PHD degree, with as subject full wavefield migration of 3D VSP data. Besides his position within the DELPHI consortium, he works as a geophysical consultant in developing and implementing cutting edge technologies to support the oil and gas industry.

Runhai Feng

Runhai Feng

Runhai Feng was born in Jurong, Jiangsu Province of China. He received his Bachelor's Degree in Geology from China University of Geosciences. In 2010, he started his master program of Geophysics in Nanjing University. His master thesis is about the analysis of the propagation of waves in anisotropic medium. In October, 2011, he joined Delft University of Technology as PhD student. His research topic is the geological modelling in the non-linear full waveform inversion.

Siddarth Sharma

Siddarth Sharma

Siddarth Sharma was born in a small town called Shahajahanpur(U.P), India in 1989. He completed his 5 year Integrated BS-MS from Indian Institute of Science Education and Research(IISER), Kolkata. During his masters he utilized his summer breaks for pursuing many Internships in academia. Later he specialized in Exploration Geophysics by pursuing International Master from a collaborated Master’s program between Institute de Physique du Globe de Paris and Mines ParisTech, France. He did his internship at TOTAL Research Facility Pau, France and worked on the project “Parameter estimation in Zero Offset 4D full waveform Inversion”. From September 2013 onwards, Siddharth has been working as a Phd student within DELPHI consortium, Where he is working on the project ‘’Geological knowledge in Nonlinear Full waveform Inversion’’ under the supervision of Prof. Stefan Luthi and Prof. Dries Gissolf.

Hussain Hammad

Hussain Hammad

Hussain Hammad received his B.Sc. degree from the University of Tulsa in 2005 and after a two-year period of working within Saudi Aramco, he went to the University of Calgary and received his M.Sc. degree from there in 2010. Since 2010 he is a geophysicist within Saudi Aramco responsible for creating seismic depth images for subsalt/pre-salt plays. In 2015 he was selected for the Advanced Degree program from Saudi Aramco and he joined the Delphi consortium as a Ph.D. candidate in March 2015 under the supervision of Dr. Eric Verschuur. He is working on extending the Full Wavefield migration (FWM) and Joint Migration Inversion (JMI) approaches to more complex, elastic media.

Aparajita Nath

Aparajita Nath

Aparajita Nath graduated from Indian Institute of Technology(IIT), Kharagpur, India in May 2014 with a five year Integrated M.Sc. degree in Exploration Geophysics. During this period, she did summer internships at Schlumberger Asia services: Borehole Geophysics domain and at IIT Roorkee under the prestigious IASc-INSA-NASI Summer Fellowship Program. After finishing her M.Sc. she worked as a Project Research Assistant in the Department of Earth Sciences at IIT Bombay from July 2014-June 2015 on the topic ‘Simultaneous micro-seismic event location & velocity inversion’. In September 2015 she joined the Delphi Consortium as a Ph.D. student working on maximizing the use of multiples in seismic data under the supervision of Dr. Eric Verschuur.

Shogo Masaya

Shogo Masaya

Shogo Masaya was born in Tokyo, Japan. He obtained his MSc in plasma physics from Kyoto University in 2008. He worked in INPEX Corporation as a geophysicist from 2008 to 2015, where he mainly conducted seismic data acquisition, processing, interpretation, and well operations such as vertical seismic profile and micro-seismic monitoring. 
He has joined Delft University of Technology and the Delphi consortium as a PhD candidate since July 2015. His current research topics are near-surface imaging and Joint Migration Inversion.

Jan-Willem

Jan-Willem

Jan-Willem did his M.Sc. studies at Delft University of Technology and received his M.Sc. degree in 2011 after finalizing the thesis on Near-surface redatuming using estimated full waveform datuming operators. After that he worked as an associate researcher within the Delphi Studio for Imaging on various implementation and demonstration projects for Delphi sponsors. Since May 2016 he is back at Delft University as a Ph.D. student. He is working on broad-band marine seismic, with the focus on describing and removing the ghost effect from 3D marine seismic data under the supervision of Dr. Gerrit Blacquière.

Özkan Sertlek

Özkan Sertlek

Özkan Sertlek received his B.Sc. (2002-2006) and M.Sc.(2006-2008) degrees from the Electronic Engineering Department of Gebze Techninal University in Turkey. He worked as a researcher and senior researcher at Technical Research Council of Turkey (TUBITAK) between 2006 and 2011. He started this PhD project at the Institute of Biology at Leiden University, as part of a larger NWO-funded project (‘The effects of underwater noise on fish and marine mammals in the North Sea’). This project was carried out in close collaboration with TNO Acoustic and Sonar group in The Hague. Since May 2016 he is a post-doc on the forward modeling of airgun source responses and their ghosts within the Delphi consortium, under the supervision of Dr. Gerrit Blacquière.

Shan Qu

Shan Qu

Shan Qu was born in 1991, in Liaoning, China. She received both B.Sc. and M.Sc. degrees in Geophysics from China University of Petroleum. Her M. Sc. thesis topic was on “Deblending of Simultaneous source Seismic Data”. In August 2015, she joined the Delphi consortium as a Ph.D. candidate. She is working on “Time-lapse Application and Uncertainty Estimation in Joint Migration Inversion” under the supervision of Dr. D. J. Verschuur.

Aayush Garg

Aayush Garg

Aayush Garg was born in Ghaziabad, India in 1991. He completed his Integrated Master's course in Geophysical Technology from Indian Institute of Technology Roorkee, India in 2015. During his masters, he utilized his summer breaks for pursuing internships in both academia and industry. In his internships, he was exposed to areas such as seismic data processing, travel-time inversion and interpretation data nomenclature standardization. His master thesis topic was "Near surface velocity structure modelling of Kumaon region using Genetic Algorithm". Upon graduation, he joined the Delphi Consortium as a PhD student under the supervision of Dr. D.J. (Eric) Verschuur in August, 2015. His current research topic is "Reservoir-oriented Joint Migration Inversion" which aims at extending the Joint Migration Inversion (JMI) to estimate the localized reservoir parameters from the surface seismic data.

Ewoud Smeur

Ewoud Smeur

Ewoud Smeur was born in 1990 in Nijmegen, The Netherlands. He received both his B.Sc. and M.Sc. from Delft University of Technology, department of Aerospace engineering. During his M.Sc. studies he did an internship on improving the flight control of the Quadshot, a hybrid drone concept, at Transition Robotics in Santa Cruz, California. In his M.Sc. thesis he made a flight dynamics model for this vehicle using test flight data. From March 2014 onwards, Ewoud has been working as a PhD student within the DELPHI consortium as part of the Robotization Project. His focus is to explore the possibilities of using drones for seismic sensor deployment. He works at the Micro Aerial Vehicle Lab (MAVLab) at the faculty of Aerospace Engineering, which is a drone lab where people with different backgrounds work together to advance the state of the art of drones.

Sixue Wu

Sixue Wu

Sixue Wu was born in 1990 in Wuhan, China. She received her B.Sc. in Geophysics from China University of Geosciences and her M.Sc. in Applied Geophysics from Delft University of Technology, ETH Zürich and RWTH Aachen University (Joint Degree). Her M.Sc. thesis was on seismic deblending and was carried out as an internship at PGS Geophysical (Netherlands) BV.   From December 2014 onwards, Sixue has been working as a PhD candidate with the DELPHI consortium, where she is working on marine seismic source encoding. 

Matteo Caporal

Matteo Caporal

Matteo Caporal was born in 1988 in Pordenone, Italy. He received his B.Sc. degree in Physics from the University of Trieste and his M.Sc. in Geophysics from the University of Pisa, both in Italy. For his M.Sc. thesis he carried out a research on the utilization of Genetic Algorithms in non-linear seismic waveform inversion problems.   In June 2014 he joined the Delphi Consortium as a Ph.D. candidate under the supervision of Dr Gerrit Blacquière. Currently his research interests focus on DSA (Dispersed Source Array) technology and on acquisition system automation and decentralization.

Nick Luiken

Nick Luiken

Nick Luiken received his Bachelor's degree in 2014 and his Master's degree in 2016 (cum laude) from the University of Twente, both in Applied Mathematics. During his master's, he focussed on theory of PDEs, scientific computing and inverse problems. In 2015, he did an internship at DWD (German Weatherservice) where he worked on algorithms for data assimilation, with a focus on the Ensemble Kalman Filter. During his thesis he focussed on an inverse problem for the Amari equation, which describes the evolution in space and time of the activity of neurons in the brain. His thesis is title "Solution Techniques for Inverse Problems in Neural Field Theory". In 2017 he started his PhD with the Delphi consortium, under supervision of Dr. Tristan van Leeuwen and Dr. Eric Verschuur. His research is concerned with uncertainty quantification of Delphi processes.

Dong Zhang

Dong Zhang

Dong Zhang was born in Taiyuan, China in 1991. He received his B.Sc. degree (2014) in applied geophysics from Jilin University and M.Sc. degree (2017) in exploration geophysics from China University of Petroleum (Beijing). His master thesis topic was about seismic imaging for complex carbonate reservoir. In August 2017, he joined the Delphi Consortium as a PhD candidate under the supervision of Dr. Eric Verschuur. Currently, his main research topic is 3D closed-loop surface-related multiple estimation (CL-SRME) with a focus on shallow water scenarios.

Shotaro Nakayama

Shotaro Nakayama

Shotaro Nakayama was born in Aomori, Japan. After receiving his M.Sc. in Geoscience from the University of Tokyo, he joined INPEX Corporation in 2007. He was then involved in several exploration projects in Suriname, Brazil, Libya and Malaysia. From 2010 to 2016, he was seconded to Abu Dhabi Marine Operating Company. Through his secondment, he worked on various seismic data acquisition and processing projects. Additionally, his responsibility extended to interpretation works such as rock physics analysis, quantitative interpretation via pre-/post-stack inversion, attribute analysis and azimuthal anisotropy analysis. In September 2017, he joined the Delphi Consortium as a PhD candidate. Since then, he has been working on survey designing for blended acquisition under the supervision of Dr. Gerrit Blacquière.

Halah Alasmri

Halah Alasmri

Halah Alasmri is a research geophysicist at EXPEC Advanced research center of Saudi Aramco since 2014.  Halah holds a bachelor and a master degrees in physics with specialty in Radiation physics. Halah had worked as physics teaching assistant at UOD back 2013 in Saudi Arabia.  She currently is a PhD student at the Delft University of Technology under the supervision of Dr. Eric Verschuur. Halah works on seismic imaging using Full Wavefield Migration methodology, with the emphasis on the effects on wave propagation of fine layering and absorption. 

Siamak Abolhassani

Siamak Abolhassani

Siamak Abolhassani, originally from Tehran, Iran, is working as a Ph.D. student at the Delft University of Technology (TU Delft), for the Delphi consortium.  Prior to attending TU Delft, he completed his master's studies in Exploration Seismology at the Institute of Geophysics, University of Tehran, Iran, in 2016. During the master's, his research focus was on the forward and inverse blocks of the Full Waveform Inversion (FWI) imaging technique in the frequency as well as time domain. Siamak is going to develop a methodology for a joint Seismic-EM data assimilation for reservoir surveillance through the Bayesian theory under the supervision of Dr. Femke Vossepoel, Prof. Evert Slob and Dr. Eric Verschuur.


The Delphi Advisory Board

" Since 2001 the Delphi Advisory Board (DAB) has become active. The Delphi research team is advised by an international board of experts "



Delphi Advisory Board

Jean-Luc Boelle

Jean-Luc Boelle - Total

Jean-Luc Boelle's is a Innovator, Team Leader at Total S.A. and has a big work history, affiliations and more.

Roald van Borselen

Roald van Borselen - Saudi Aramco

His direct and forward-looking approach is to be recognized. He carried out the work with passion and interest in science and has alot of projects on his name, both in a theoretical and practical way.

Todd Bredbeck

Todd Bredbeck – Wintershall

Gary Hampson

Gary Hampson – DUG

Fons ten Kroode

Fons ten Kroode - Shell

Fons ten Kroode obtained a PhD (1988) in pure mathematics from the University of Amsterdam. After spending two years as an assistant professor in Amsterdam and at the University of Illinois at Urbana Campaign, he joined Shell Research in 1991 as a mathematical geophysicist. He has worked on a variety of projects including crosswell seismics, multi-valued migration, automatic velocity analysis, and interbed multiples.

Peter Mesdag

Peter Mesdag – CGG

Current Jason a CGG company Previous
Fugro-Jason, Jason Geosystems BV Education
Delft University of Technology


Tasks of the Board:

The primary task of the DAB is a facilitating one. The DAB will do this by assisting the project directors on matters that are at the interface of science and industry. The DAB will also advise in efforts to realize a healthy growth of the consortium, particularly by bringing in more national oil companies.Members of the DAB do not represent their company, but act as members of the E&P community that favor a strong and dynamic Delphi. The minutes of each DAB meeting will be sent to all consortium members.

Honorary Members:

Craig Beasley - retired Schlumberger
Mohamed Hadidi - retired ExxonMobil
Panos Kelamis – retired Saudi Aramco
Paul Meldahl – retired Statoil
Bruce VerWest - retired CGG
David Wilkinson - Chevron

Current DAB members

Jean-Luc Boelle – Total
Roald van Borselen - Saudi Aramco
Todd Bredbeck – Wintershall
Gary Hampson – DUG
Fons ten Kroode – Shell
Peter Mesdag – CGG
Walter Rietveld – BP


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