Our Team

Lionel Bertrand

Lionel Bertrand, geologist Ph.D. at Université de Lorraine and president of Enerex SAS. With his Ph.D. Thesis « Study of geothermal reservoirs developed in the basement and at the interface with the sedimentary units. », He is specialized in the study of deep geothermal reservoirs. He develops an Expertise in the analysis and modelization of fractured reservoirs. 

Yves Géraud

Yves Geraud, a scientific contributor of Enerex, was Lecturer at the University of Strasbourg until 1995. He is Professor at the Université de Lorraine and a researcher at the GeoRessources Laboratory since 2013. Expert in petrophysics measurement and rock properties, he is specialized in the study of unconventional reservoirs for petrologic resources and high energy geothermal projects. He also insure the link between public authorities and Enerex for our R&D projects.

Marc Diraison

Marc Diraison is a Lecturer at the University of Strasbourg since 2000 and a researcher from the GeoRessources Laboratory since 2018. He is a  scientific contributor to Enerex. Expert in structural geology and geophysics data interpretation. He is specialized in the study of geologic structures and associated fluids circulation.

Our reference studies and previous work

Although newly created, ENEREX is based on the experience acquired during the long-term Research of the team. Those are especially focused on fractured and heterogenous reservoirs characterization for petroleum or geothermal purposes in different industrial and academic research programs. Among the most striking that led to scientific publications, can be cited the work on field analogs to basement rock reservoirs in the West of Marocco, in Uganda, Yémen, Spain, France, Greece, or the Tcheche Republic.

Our experience in rock properties characterization rests also on various projects, namely on well logs and boreholes samples from the experimental deep geothermal site at Soultz-sous-Forêt or in petroleum fields in the Upper Rhine Graben (ENGIE).

Scientific publications

Bertrand L., Y. Géraud, E. Le Garzic, J. Place, M. Diraison, B. Walter, S. Haffen, 2015 : A multiscale analysis of a fracture pattern in granite: A case study of the Tamariu granite, Catalunya, Spain. Journal of Structural Geology, 78, 52-66.

Bertrand L., J. Jusseaume, Y. Géraud, M. Diraison, P.-C. Damy, V. Navelot, S. Haffen, 2018 : Structural heritage, reactivation and distribution of fault and fracture network in a rifting context: Case study of the western shoulder of the Upper Rhine Graben. Journal of Structural Geology, 108, 243-255.

Bertrand L., B. Gavazzi, J. Mercier de Lépinay, M. Diraison, Y. Géraud, M. Munschy, 2020 : On the use of aeromagnetism for geological interpretation : 2. A case study on structural and lithological features in the Northern Vosges. Journal of Geophysical Researh: solid Earth, in press.

Bossennec C., Y. Géraud, I. Moretti, L. Mattioni, D. Stemmelen, 2018 : Pore network properties of sandstones in a fault damage zone. Journal of Structural Geology, 110, 24-44.

Dutilleul J., S. Bourlange, M. Conin, Y. Géraud, 2020 : Quantification of bound water content, interstitial porosity and fracture T porosity in the sediments entering the North Sumatra subduction zone from Cation Exchange Capacity and IODP Expedition 362 resistivity data. Marine and Petroleum Geology, 111, 156-165.

Gavazzi B., L. Bertrand, M. Munschy, J. Mercier de Lépinay, M. Diraison, Y. Géraud, 2020 : On the use of aeromagnetism for geological interpretation: 1. Comparison of scalar and vector magnetometers for aeromagnetic surveys and an equivalent source interpolator for combining, gridding, and transforming fixed altitude and draping data sets. Journal of Geophysical Research: Solid Earth, 125, e2019JB018870. 

Géraud Y., M. Diraison, N. Orellana, 2006 : Fault zone geometry of a mature active normal fault: A potential high permeability channel (Pirgaki fault, Corinth rift, Greece). Tectonophysics, 426, 61-76.

Géraud Y., M. Rosener, F. Surma, J. Place, E. Le Garzic, M. Diraison, 2010 : Physical properties of fault zones within a granite body: Example of the Soultz-sous-Forêts geothermal site. Comptes Rendus Geoscience, 342, 566-574.

Haffen S., Y. Géraud, M. Diraison, C. Dezayes, 2013 : Determination of fluid-flow zones in a geothermal sandstone reservoir using thermal conductivity and temperature logs. Geothermics, 46, 32-41.

Haffen S., Y. Géraud, M. Rosener, M. Diraison, 2017 : Thermal conductivity and porosity maps for different materials: A combined case study of granite and sandstone. Geothermics, 66, 143–150.

Le Garzic E., T. de L’Hamaide, M. DiraisonY. Géraud, J. Sausse, M. de Urreiztieta, B. Hauville, J.-M. Champanhet, 2011 : Scaling and geometric properties of extensional fracture systems in the proterozoic basement of Yemen. Tectonic interpretation and fluid flow implications. Journal of Structural Geology, 33, 519-536.

Le Maire P., L. Bertrand, M. Munschy, M. Diraison, Y. Géraud, 2020 : Aerial magnetic mapping with an UAV and a fluxgate magnetometer: a new method for rapid mapping and upscaling from the field to regional scale. Geophysical Prospecting, accepted.

Navelot V., Y. Géraud, A. Favier, M. Diraison, M. Corsini, J.-M. Lardeaux, C. Verati, J. Mercier de Lépinay, L. Legendre, G. Beauchamps, 2018 : Petrophysical properties of volcanic rocks and impacts of hydrothermal alteration in the Guadeloupe Archipelago (West Indies). Journal of Volcanology and Geothermal Research, 360, 1–21.

Place J., M. Diraison, Y. Géraud, A. Hemin, 2018 : Horst Inversion Within a Decollement  Zone During Extension Upper Rhine Graben, France, in Misra, A. A. and. Mukherjee., S., ed., Atlas of Structural Geological Interpretation from Seismic Images, John Wiley & Sons Ltd, p. 44-46.

Rosener M. et Y. Géraud, 2007 : Using physical properties to understand the porosity network geometry evolution in gradually altered granites in damage zones. Geological Society, London, Special Publications, 284, 175-184.

Stanek M. et Y. Géraud, 2019 : Granite micro-porosity changes due to fracturing and alteration : secondary mineral phases as proxies for porosity and permeability estimation. Solid Earth, 10, 251-274.

Surma F., Y. Géraud, L. Pourcelot, F. Gauthier-Lafaye, J.B. Clavaud, M. Zamora, M. Lespinasse, M. Cathelineau, 2003 : Microstructures d’un grès affecté par une faille normale : anisotropie de connectivité et de perméabilité. Bulletin de la Société Géologique de France, 174, 295-303.

Walter B., Y. Géraud, D. Bartier, C. Morlot, M. Diraison, 2018 : Petrophysical and mineralogical evolution of the crystalline weathered basement in Western Uganda. Implications for fluid transfer and storage. AAPG bull., 102, 6, 1035-1065.

Walter B., Y. Géraud, Y. Hautevelle, M. Diraison, F. Raisson, 2019 : Fluid circulations at structural intersections through the Toro-Bunyoro fault system (Albertine rift, Uganda): a multidisciplinary study of a composite hydrogeological system. Geofluids, Article ID 8161469, 20p.

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