Profile & expertise

The University of Cergy-Pontoise is an academic research and teaching center. The Geosciences and Environment Lab is specialized in the characterization of geological reservoirs on the mineralogical and petrographical, petrophysical and geophysical points of view.


Role in the Project

The main UCP tasks will concern a precise petrophysical characterization of Vermilion borehole data and samples within the basin of Paris. UCP will organize several training programs using MEET infrastructure for the purpose of WP8 (communication and dissemination).

Pr Béatrice Ledésert is full professor at the CY Cergy Paris Université. She works mostly on geothermal projects and in particular for the Soultz-sous-Forêts Enhanced Geothermal system (for more than 20 years) and for Geotref, an exploration project in Vieux Habitants, Guadeloupe (10 km south of Bouillante geothermal plant, French West Indies). Her domain of interest is petrography and mineralogy correlated with borehole data applied to the determination of fluid flow pathways, which allows the selection of zones to be stimulated in the boreholes. 

Research topics: Discontinuity networks and fluid flows applied to geothermal projects and various other environments (polluted sites, mud volcanoes), petrography and mineralogy, structural geology, green building materials, aggregates and concrete.

1993: PhD about fracture networks and hydrothermal alteration of the Soultz-sous-Forêts’ granite, university of Poitiers, France.

1994-2004: assistant professor, university of Lille, France

2004-present: professor, Cy Cergy Paris University, France

Béatrice Ledésert - UCP

Expert engineer recruited to support WP3, WP4, WP5, and WP8, Xavier Sengelen is a geologist with a strong background in geothermal energy including exploration and production by means of structural geology, petrography, petrophysics and well data management. His role requires strong multidisciplinarity to be efficient in several work packages: study of scalings, exploration of reservoirs in sedimentary and crystalline geological settings, communication and dissemination of results including organization of geothermal schools.

2009-2011: Research assistant at Academia Sinica and the National Central University (Taiwan) – mountain building processes, low-temperature thermochronology.

2011-2013: Exploration geologist at AREVA in Gabon – drilling campaigns, grassroots projects management, well logging interpretation and core logging for geochemical sampling

2013-2014: Study Engineer in the SIGMA European project at the University of Aix-Marseille and CNRS in partnership with EDF – GIS-based structural study and catalogue of seismic sources in SE-France.

2015-2016: Study Engineer at the CY Cergy Paris University – GIS synthesis of Permian basins of Western Europe and structural map of Northern Africa / Betics.

2018 (ongoing): Study Engineer for the H2020 MEET Geothermal Project at the University of Cergy-Pontoise.

2009: M.Sc in structural geology and geochemistry, University of Paris-Sud – Master thesis: Coupling between tectonic and diagenesis in the “Red Beds” of the South-Atlasic front (Morocco), kinematic and petrological approaches.

2016: University Diploma (D.U.) “Project management in geothermal energy”, organized by the University of Strasbourg and the “Ecole Nationale du Génie de l’Eau et de l’Environnement de Strasbourg” (ENGEES)

Xavier Sengelen - UCP

Research topics of Ronan Hébert: Petrology and fluid-rock interactions in geothermal reservoirs fluids, culturage heritage rocks. Innovative building materials with low environmental impact

1993: PhD – The tectono-metamorphic evolution of an island-arc at the upper Proterozoic: The Saint-Brieuc domain (Armorican massif, France).

1993-1996: Post-doctoral research fellow at the University of Southampton (UK) on fracturing and fluid flow through continental and oceanic crust.

1996: Assistant Professor, University of Cergy-Pontoise, France.

2004-present: Professor, University of Cergy-Pontoise, France

2013: Habilitation à Diriger des Recherches (HDR).

I have been working on the characterization of the relationships between calcite precipitation/fractures/fluid flow in Soultz-sous-Forêts Boreholes. Since 2015, I am participating in the Geotref project which aims to improve the understanding of fractured geothermal reservoirs (

Ronan Hébert - UCP

Philippe Robion is assistant professor at the CY Cergy Paris University. He works on the reservoir properties of sedimentary and has developed an expertise on the characterization of the relationship between microstrutures, fractures and both petrophysical and geomechanical properties of rocks. He particularly worked on carbonate rocks and sandstones coming from different foreland basins and investigated the effects of the tectonic stress and strain on the distribution of fractures at different scales.

Philippe Robion - UCP

Jean-Baptiste Regnet is an Assistant Professor at the CY Cergy Paris University since sept. 2018. The main avenues of research he has been pursuing until now are essentially related to the feedbacks between fluid-rock interactions and the evolution of rock physical properties or their mechanical behavior. He has a strong background in sedimentary geology of carbonate systems and their associated diagenesis.

2011 – 2014 : Ph.D Thesis – Physical properties and mechanical behavior of microporous carbonates : integrated and experimental approach. UCP, Paris, France.

2014 – 2016 : Postdoctoral Fellow – Physical properties of continental carbonate rocks, from controlling factors to models. ENS, Paris, France.

2016 – 2018 : Postdoctoral Fellow – Mechanical compaction and permeability anisotropy of heterogeneous limestones. McGill University, Montreal, Canada.

Jean-Baptiste Regnet - UCP

Christophe Barnes has more than 20 years of experience in research, research and development, and industry projects management.

Strong technical expertise in data processing, numerical modeling, geophysics and software development.

Dual education: High-level generalist engineer (Ecole des Mines de Paris) and PhD in geophysics (Paris-VII).

Currently President and Director of GIM-labs company and half time Professor at the CY Cergy Paris University.

Main professional experiences:

  • 2012 – today : Technical director, president and expert of GIM-labs company: R&D, engineering and expertise in geophysics for oil&gas and geotechnical companies (seismic imaging, monitoring, reservoir characterization, numerical modeling). (see
  • 2000 – 2012 : Consultant-Expert in scientific engineering, in geophysics for oil company and for nuclear waste industry, in HPC computing.
  • 11/2006 – today : Half time Professor at UCP: Teaching in bachelor and master levels in geophysics, geochemistry, thermodynamics, geophysical imaging. Research in geophysical imaging, numerical modeling of seismic wave propagation, anisotropic analysis of samples, inverse problem for mountain orogenesis.
  • 2/2003 – 9/2006 : Technical director of the software service company DATUS, acquired by AlcionGroup company, then technical director of the industry business unit of AlcionGroup (40 engineers).
  • 12/2004 – 9/2006 : Projects direction example of major project: hardware and software project achieved by AlcionGroup for SNCF (French RailWay) 12 engineers, 1.5 million euros, duration 2 years. Acquisition system onboard of a TGV (high velocity train), named Iris320 and dedicated to the measurement at very high velocity (real-time, data acquisition, database, high availability, specific network). (see TGV_IRIS_320).


Google Scholar statistics at

Research Gate statistics at

Christophe Barnes - UCP

Cédric Bailly is a postdoctoral researcher at the CY Cergy Paris University since January 2020. His work is focusing on the geological controlling factors of physical properties of rocks, using geological characterization and geophysical measurements at different scales. His main skills include sedimentary petrology of carbonate rocks (facies, diagenesis, depositional environments), multi-scale acoustic measurements (from millimetric to pluri-metric scale) and modelling.

2016 – 2019 : PhD Thesis – Multi-scale characterization of continental carbonates (Samos Island, Upper Miocene) : Links between microstructure and physical properties, impact of diagenesis. IFPEN & ENS, Paris, France.

2016 : MSc Thesis – Diagenesis and geochemistry of the dolomitization of the Chalk (Paris Basin, Upper Cretaceous). UBFC, Dijon, France.