IFPEnergies Nouvelles

Rueil-Malmaison, France

IFPEnergies Nouvelles

Rueil-Malmaison, France
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Leroy S.,CNRS Paris Institute of Earth Sciences | Ellouz-Zimmermann N.,IFPEnergies Nouvelles | Corbeau J.,CNRS Paris Institute of Earth Sciences | Rolandone F.,CNRS Paris Institute of Earth Sciences | And 30 more authors.
Terra Nova | Year: 2015

We explored the submarine portions of the Enriquillo-Plantain Garden Fault zone (EPGFZ) and the Septentrional-Oriente Fault zone (SOFZ) along the Northern Caribbean plate boundary using high-resolution multibeam echo-sounding and shallow seismic reflection. The bathymetric data shed light on poorly documented or previously unknown submarine fault zones running over 200 km between Haiti and Jamaica (EPGFZ) and 300 km between the Dominican Republic and Cuba (SOFZ). The primary plate-boundary structures are a series of strike-slip fault segments associated with pressure ridges, restraining bends, step overs and dogleg offsets indicating very active tectonics. Several distinct segments 50-100 km long cut across pre-existing structures inherited from former tectonic regimes or bypass recent morphologies formed under the current strike-slip regime. Along the most recent trace of the SOFZ, we measured a strike-slip offset of 16.5 km, which indicates steady activity for the past ~1.8 Ma if its current GPS-derived motion of 9.8 ± 2 mm a-1 has remained stable during the entire Quaternary. © 2015 John Wiley & Sons Ltd.

Caumon G.,French National Center for Scientific Research | Gray G.,ExxonMobil | Antoine C.,French National Center for Scientific Research | Titeux M.-O.,IFPEnergies Nouvelles
IEEE Transactions on Geoscience and Remote Sensing | Year: 2013

Remote sensing data provide significant information to constrain the geometry of geological structures at depth. However, the use of intraformational geomorphologic features such as flatirons and incised valleys often calls for tedious user interaction during 3-D model building. We propose a new method to generate 3-D models of stratigraphic formations, based primarily on remote sensing images and digital elevation models. This method is based on interpretations of the main relief markers and interpolation of a stratigraphic property on a tetahedral mesh covering the domain of study. The tetrahedral mesh provides a convenient way to integrate available data during the interpolation while accounting for discontinuities such as faults. Interpretive expert input may be provided through constrained interactive editing on arbitrary cross-sections, and additional surface or subsurface data may also be integrated in the modeling. We demonstrate this global workflow on a structurally complex basin in the Sierra Madre Oriental, Northeastern Mexico. Copyright © 1980-2012 IEEE.

Corbeau J.,CNRS Paris Institute of Earth Sciences | Rolandone F.,CNRS Paris Institute of Earth Sciences | Leroy S.,CNRS Paris Institute of Earth Sciences | Mercier de Lepinay B.,French National Center for Scientific Research | And 3 more authors.
Tectonophysics | Year: 2016

Multibeam bathymetry data and multichannel seismic reflection profiles have been collected at the end of 2012 along the Enriquillo-Plantain-Garden Fault Zone (EPGFZ) in the Jamaica Passage, between Jamaica and Hispaniola. Analysis of the data set reveals the tectonic evolution and the stratigraphic complexity of the northern Caribbean boundary. Stratigraphic correlations with previous marine and on land studies are proposed to place the identified seismic sequences in their regional tectonic history. Two distinct crustal domains are interpreted. Typical stratigraphic sequences for the rifted blocks of the Eastern Cayman Trough margin are identified in five basins of the Jamaica Passage, highlighting the eastward limit of the Cayman Trough margin. These inherited basins are deformed and folded during a first phase of compression that could correspond to the regional tectonic rearrangement recorded in the early Miocene (about 20 Ma). A distinct crustal domain that we propose to relate to the Carib Beds (Caribbean typical reflectors A″, B″ and V) is identified in the southern part of the Jamaica Passage, indicating that the Caribbean Large Igneous Province could extend up to the extreme northeast part of the Lower Nicaragua Rise. The left-lateral EPGFZ currently cuts across two pre-existing basins, the Morant and Matley basins. During the activity of the EPGFZ, these basins are deformed and folded indicating a second phase of compression. In contrast, the Navassa basin, located in the middle of the Jamaica Passage, results from the strike-slip motion of the EPGFZ and is interpreted as an asymmetrical basin bordered by the EPGFZ only on its northern side. © 2016 Elsevier B.V.

Trichard F.,CNRS Institute of Analytical Sciences | Gilon N.,CNRS Institute of Analytical Sciences | Lienemann C.P.,IFPEnergies Nouvelles | Baco-Antoniali F.,IFPEnergies Nouvelles
Journal of Analytical Atomic Spectrometry | Year: 2016

On-line nickel and vanadium determination in oil samples was proposed using laser induced breakdown spectroscopy to reach low mg kg-1 concentrations. Both 266 nm and 532 nm emissions of a neodymium YAG laser were evaluated and the visible wavelength gave better results. An original optimization strategy employing a Doelhert design and full quadratic model was carried out. The number of laser shots, the delay time, the integration time gate and the laser energy were selected as factors. Measurements were compared under static and dynamic conditions (i.e. the sample being moved at a cc h-1 flow rate as it is under the process conditions), and no significant difference in terms of sensitivity and detection limits was observed due to the viscous nature of oil samples. Detection limits achieved for vanadium were 7 mg kg-1 and 31 mg kg-1 for nickel. In view of on-line measurements a Czerny Turner spectrometer equipped with a photomultiplier was evaluated. Then, the LIBS method developed enabled the plot of linear calibration curves for Ni and V with a sensitivity in agreement with the need of the petroleum industry for on-line determination. © The Royal Society of Chemistry 2016.

Roiban L.,CNRS Institute of Genetics and of Molecular and Cellular Biology | Ersen O.,CNRS Institute of Genetics and of Molecular and Cellular Biology | Hirlimann C.,CNRS Institute of Genetics and of Molecular and Cellular Biology | Drillon M.,CNRS Institute of Genetics and of Molecular and Cellular Biology | And 4 more authors.
ChemCatChem | Year: 2016

The ability of energy-filtered transmission electron microscopy (EFTEM) tomography to provide 3D chemical maps at the nanoscale opens a new way to analyse heterogeneous materials quantitatively. In association with other techniques, EFTEM tomography has been employed in the study of amorphous silica-alumina catalyst supports. Two types of samples prepared either by mechanical mixing (MM) or by the precipitation of silica on boehmite (PSB) that have similar proportions of silica and alumina were analysed. The sample synthesised by the PSB method shows a smaller degree of heterogeneity than the sample obtained by MM. For both types of samples, a higher concentration of alumina was found at the surface, whereas silica mostly constituted the core of the sample. A thermal treatment in a humid atmosphere was shown to redistribute the silica inside the sample as well as on its surface, which decreased the specific surface area at the same time. The acid sites localisation was defined as a specific curve at the interface between the two components upon reaching the surface of the support. The length of this curve, the "alumina-silica boundary line", was estimated by using EFTEM tomography and discussed qualitatively with the chemical inter-mixing information deduced from additional techniques such as FTIR and NMR spectroscopy. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim..

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