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Variations et variabilité spatio-temporelle des argilites callovo-oxfordiennes de Meuse/Haute-Marne : valorisation géostatistique des données diagraphiques

Abstract : Andra (National Radioactive Waste Management Agency) has conducted studies in its Meuse/Haute-Marne Underground Research Laboratory located at a depth of about 490 m in a 155-million-year-old argillaceous rock: the Callovo-Oxfordian argillite. The purpose of the present work is to obtain as much information as possible from high-resolution log data and to optimize their analysis to specify and characterize space-time variations of the argillites from the Meuse/Haute-Marne site and subsequently predict the evolution of argillite properties on a 250 km2 zone around the underground laboratory (transposition zone). The aim is to outline a methodology to transform depth intervals into geological time intervals and thus to quantify precisely the sedimentation rate variation, estimate duration; for example the duration of biostratigraphical units or of hiatuses. The latter point is particularly important because a continuous time recording is often assumed in geological modelling. The spatial variations can be studied on various scales. First, well-to-well correlations are established between seven wells at different scales. Relative variations of the thickness are observed locally. Second, FMI® (Fullbore Formation MicroImager, Schlumberger) data are studied in detail to extract as much information as possible. For example, the analysis of FMI® images reveals a clear carbonate - clay interbedding which displays cycles. Third, geostatistical tools are used to study these cycles. The variographic analysis of conventional log data shows onemetre cycles. With FMI® data, smaller periods can be detected. Variogram modelling and factorial kriging analysis suggest that three spatial periods exist. They vary vertically and laterally in the boreholes but cycle ratios are stable and similar to orbital-cycle ratios (Milankovitch cycles). The three periods correspond to eccentricity, obliquity and precession. Since the duration of these orbital cycles is known, depth intervals can be converted into time intervals (duration) and thus give real sedimentation rates, an estimation of the duration of three ammonites zones (Coronatum, Lamberti and Mariae zones) and a quantification of hiatus duration.
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https://pastel.archives-ouvertes.fr/pastel-00585401
Contributor : Bibliothèque Mines Paristech <>
Submitted on : Tuesday, April 12, 2011 - 5:23:11 PM
Last modification on : Wednesday, October 14, 2020 - 3:52:38 AM
Long-term archiving on: : Wednesday, July 13, 2011 - 2:49:04 AM

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  • HAL Id : pastel-00585401, version 1

Citation

Marie Lefranc. Variations et variabilité spatio-temporelle des argilites callovo-oxfordiennes de Meuse/Haute-Marne : valorisation géostatistique des données diagraphiques. Sciences de la Terre. École Nationale Supérieure des Mines de Paris, 2007. Français. ⟨pastel-00585401⟩

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