Xavier Freulon

Xavier Freulon
MINES ParisTech | ParisTech · Centre de Géosciences (GEOSCIENCES)

PhD

About

23
Publications
2,537
Reads
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221
Citations
Citations since 2016
10 Research Items
126 Citations
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20162017201820192020202120220510152025

Publications

Publications (23)
Article
Simulations of object-based models are widely used in various fields of geoscience to represent subsurface heterogeneities. A prototype of such a model is the Boolean model. Based on the stability and decomposition properties, a novel algorithm is proposed to simulate Boolean models, stationary or not, subject to foreground and background point con...
Article
When too few field measurements are available for the geological modeling of complex folded structures, the results of implicit methods typically exhibit an unsatisfactory bubbly aspect. However, in such cases, anisotropy data are often readily available but not fully exploited. Among them, fold axis data are a straightforward indicator of this loc...
Article
Full-text available
Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants produced by anthropogenic activities that contaminate all environmental spheres, including soils. This study focused on PAHs measured in 2154 soils in France, covering the entire territory based on a regular sampling grid. The quantified concentrations in the Σ15 PAHs ranged...
Article
Full-text available
Uranium In Situ Recovery (ISR) is based on the direct leaching of the uranium ore in the deposit by a mining solution. Fluid flow and geochemical reaction in the reservoir are difficult to predict due to geological, petrophysical and geochemical uncertainties. The reactive transport simulation code used to model ISR is very sensitive to the spatial...
Preprint
Full-text available
When too few field measurements are available for the geological mod-ling of complex folded structures, results of implicit methods typically exhibit an unsatisfactory bubbly aspect. However, in such cases, anisotropy data are often readily available but not fully exploited. Among them, fold axis data are a straightforward indicator of this local a...
Preprint
Full-text available
Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants produced by anthropogenic activities that contaminate all environmental spheres, including soils. This study focused on PAHs measured in 2154 soils in France, covering the entire territory based on a regular sampling grid. The quantified concentrations in the Σ15PAHs ranged f...
Article
Characterization of contamination in soils or groundwater resulting from industrial activities is critical for site remediation. In this study, geostatistics and physically-based simulations are combined for estimating levels of contamination within the unsaturated zone. First, a large number of flow and transport simulations are run and their outp...
Article
Full-text available
A spectral algorithm is proposed to simulate an isotropic Gaussian random field on a sphere equipped with a geodesic metric. This algorithm supposes that the angular power spectrum of the covariance function is explicitly known. Direct analytic calculations are performed for exponential and linear covariance functions. In addition, three families o...
Article
Full-text available
The plurigaussian model is particularly suited to describe categorical regionalized variables. Starting from a simple principle, the thresh-olding of one or several Gaussian random fields (GRFs) to obtain categories, the plurigaussian model is well adapted for a wide range ofsituations. By acting on the form of the thresholding rule and/or the thre...
Article
Historically, linear and lognormal krigings were first created to estimate the in situ mineral resources of blocks. Nonlinear geostatistics and indicator kriging were subsequently developed to evaluate also the portion recovered when applying a cut-off on selective mining units (SMUs) within blocks. In practice these methods are generally based eit...
Article
In some ore deposits, the grade distribution is heavy-tailed and high values make the inference of first- and second-order statistics nonrobust. In the case of gold data, high values are usually cut and the block estimation is performed using truncated grades. With this method, a part of the deposit is omitted, resulting in a potential bias on reso...
Article
Full-text available
Domaining is very often a complex and time-consuming process in mining assessment. Apart from the delineation of envelopes, a significant number of parameters (lithology, alteration, grades) are to be combined in order to characterize domains or subdomains within the envelopes. This rapidly leads to a huge combinatorial problem. Hopefully the numbe...
Article
In some metallic deposits, the grade distribution is skewed and extreme values make the inference of first and second order statistics imprecise. In the case of gold data, high values are usually cut and the estimation is performed using cut grades. With this method, a part of the deposit is omitted, resulting in a potential bias on resources figur...
Article
France's Naval Oceanographic and Hydrographic Service (SHOM) operates multibeam echo sounders (MBES) for hydrographic surveys, which provide a full coverage of the seabed with a fine resolution. The data sets contain sparse erroneous soundings, which must be detected and removed. Cleaning methods, mainly manual, ensure high quality data sets but re...
Conference Paper
The French Naval Oceanographic and Hydrographic Service (SHOM) operates two multibeam echo sounders for hydrographic surveys. These systems provide a full coverage of the sea bed with a fine resolution. The data sets contain sparse erroneous soundings which must be detected and removed. Cleaning methods in use are mainly manual. They ensure high qu...
Article
A three dimensional geological model of a reservoir defines the matrix heterogeneities and the petrophysical properties (porosity, permeabilities, saturations). To construct a model two sources of information are used: a conceptual model and the available measured data (subsurface and outcrop) interpolating techniques are needed. To integrate these...
Chapter
We consider the problem of simulating a multigaussian random vector observed through non linear and/or corrupted sensors. To sample the conditional distribution, linear methods such as conditional kriging or sequential Gaussian simulation can be applied only to the case of linear observations. But more complex observations can be integrated into st...
Chapter
Functions with mixed discrete/continuous distribution, random sets or coregionalizations between a function and a random set can be modelled using gaussian random functions. In these cases, the conditions at experimental points are expressed in terms of inequalities: 1 ≤ i ≤ n, a i ≤ X i ≤ b i . The simulation with composite constraints (equalities...

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Projects (2)
Project
Website : http://cg.ensmp.fr/rgeostats RGeostats is the Geostatistical R Package developed by the Geostatistics Lab of the Geosciences Research Center of MINES ParisTech. RGeostats offers most of the famous geostatistical techniques invented or developed by our Lab since decades. In particular, it is designed to tackle problems with several variables defined in a space of any dimensions. It is particularly adapted for students or researchers who want to test geostatistical procedures using R scripts.
Project
Website: https://flumy.minesparis.psl.eu FLUMY is a process-based model for meandering channels in both fluvial and turbidites environments. FLUMY combines first-order hydraulic equations to track the evolution of meandering channels and realistically build associated sediment accumulations. FLUMY generates 3D reservoir models following user-defined multi-sequences scenario, which can be conditioned to existing subsurface datasets (well or seismic data).