Jean-Jacques Royer

Jean-Jacques Royer
University of Lorraine | UdL · GeoRessources Laboratory

About

135
Publications
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1,190
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Publications

Publications (135)
Article
Full-text available
This publication investigates indirect in-situ bioleaching as an alternative mining technology for minimizing waste production, environmental impact, and chemical consumption. The process consists in injecting a leaching solution into a targeted ore body for dissolving base metal bearing minerals, while iron-oxidizing microorganisms regenerate the...
Article
The mining industry needs effective techniques to meet the future challenges of resources extraction. As the deposits become more and more complex, a very good knowledge of an orebody is necessary. Mineralogical characterization is an essential contribution to improve the knowledge on the ore and wastes for a given mining project. It could bring ma...
Chapter
Full-text available
A database of European granite-related uranium deposits containing the average grade and resources for individual ore deposits has been constituted from the resources declared by the countries available in the literature and in the UDEPO website of the IAEA. This database was used to evaluate the statistical distribution of deposit size and grade a...
Chapter
Investigating uranium resources is a significant opportunity for the future energy policy. Uranium deposits are usually classified according to their host rocks, for instance, in the uranium database of the International Atomic Energy Agency (IAEA) in which the uranium deposits are re-grouped into 15 major types18. This work investigates uranium re...
Article
Full-text available
This work results from a cooperative scientific program between the Perm State University (Russia) and the University of Lorraine (France). Its objectives are to integrate modern 3D geomodeling in order to improve sustainable mining extraction, especially for predicting and avoiding the formation of sinkholes disaster potential zones. Systematic ex...
Article
Full-text available
This work aims at improving the exploitation of the K, Mg, salts ore of the Verkhnekamskoye deposit using advanced information technology (IT) such as 3D geostatistical modeling techniques together with high performance flotation. It is expected to provide a more profitable exploitation of the actual deposit avoiding the formation of dramatic sinkh...
Article
Full-text available
Ultra-sonic enhanced flotation ore process is a more efficient technique for ore recovery than classical flotation method. A classical simplified analytical Navier-Stokes model is used to predict the effect of the ultrasonic waves on the cavitations bubble behaviour. Then, a thermodynamics approach estimates the temperature and pressure inside a bu...
Article
Full-text available
The ore process flotation technique is enhanced by using external ultra-sonic waves. Compared to the classical flotation method, the application of ultrasounds to flotation fluids generates micro-bubbles by hydrodynamic cavitation. Flotation performances increase was modelled as a result of increased probabilities of the particle-bubble attachment...
Conference Paper
The gas of coal seam represents the non-conventional resources of energy of big industrial importance, which exist in considerable volumes worldwide, but they are confined in low-permeable coal rocks (matrix permeability is often less than 1 mD). Often the coal seams are naturally fractured due to their mechanical fragility to different deformation...
Conference Paper
Full-text available
In-situ leaching and bio-leaching have recently received an increasing attention from research and industry as a cost effective biotechnology for recovering metals from deep bur-ried deposits. They consist in injecting a leaching solution into the targeted ore body for dissolving base metal bearing minerals, and in regenerating the solution thanks...
Conference Paper
Full-text available
The in-situ recovery (ISR) method involves injection and producer wells between which a leach solution circulates and recovers the targeted commodity directly within the ore body. Pregnant solution is then brougth back to the surface, hydrometallurgically processed and renewed into fresh leach solution. This process is already well known in the ura...
Article
Full-text available
The classical application of Theory of Sampling (TOS) is univariate. However, most practical situations address multi-analyte issues, in which the common belief is that one should focus a variographic study on the analyte with the most heterogeneous distribution. This paper introduces a multivariogram approach to process sampling and compares it wi...
Article
We assess stratigraphic correlation uncertainties by stochastically generating several possible correlations lines between a set of stratigraphic logs. We motivate the use of automatic correlation methods to sample this uncertainty and introduce a stochastic version of Dynamic Time Warping (DTW) that correlates two logs. This method is extended to...
Conference Paper
Full-text available
A broad variety of gold deposits were formed within fault systems that provide a mineralized fluid with necessary conditions for metal accumulations. However, some gold occurrences are located far from the main faults. In this case, the permeability of the rock mass is caused by internal damage developed during a deformation event. It is possible t...
Conference Paper
Several gold deposits are related to fault systems that control metals’ transport and accumulation through relatively high permeable discontinuous structures. However, some gold deposits form during the same deformation event but occur at locations far from the main faults. In those cases, due to the rock mass heterogeneity, the fracture systems ca...
Poster
Whilst a broad variety of gold deposits are linked to fault systems, some others are located far from main faults in fractured zones caused by internal rock damage developed during deformation events. Restoration tools are used here to estimate deformation attributes for predicting such off-fault damage zones.
Chapter
3D geomodelling, a computer method for modelling and visualizing geological structures in three spatial dimensions, is a common exploration tool used in oil and gas since more than several decades. When adding time, 4D modelling allows reproducing the dynamic evolution of geological structures, and reconstructing the past deformation history of geo...
Chapter
The Polish Kupferschiefer, with sediment-hosted polymetallic (Cu, Ag, Au, PGE) deposits, is one of the most important sources for copper and silver in the world. Within the framework of the ProMine project, the Lubin region (southwestern Poland), was selected for modelling the geological formations in 3 dimensions and 4 dimensions in order to bette...
Conference Paper
Coal Bed Methane (CBM) is gas stored in coal layers, generally extracted from wells after hydraulic fracturing and/or CO2 or solvent injections. The Karaganda Basin was selected to develop CBM production because of its huge gas potential (4 300 Bm3 equivalent to 2 billion tons of coal, with gas content about 15-25 m3/t of coal (for comparison San J...
Conference Paper
Full-text available
A broad variety of gold-deposits are related to fault systems developed during a deformation event. Such discontinuities control the metals transport and allow the relatively high permeability necessary for the metals accumulation during the ore-deposits formation. However, some gold deposits formed during the same deformation event occur at locati...
Conference Paper
Full-text available
Predicting fractures in rocks is one of the most important issues in reservoir engineering for enhancing oil and gas production from low permeable reservoirs and unconventional formations. This work discusses a theoretical framework for predicting fractures through time and space during a stimulation hydraulic fracturing test in anisotropic medium....
Article
Full-text available
This paper presents a matrix formulation of factorial kriging, and its relationships with simple and ordinary kriging. Similar to other kriging methods, factorial kriging can be applied to both stationary and intrinsic stochastic processes, and is often used as a local operator. Therefore, the concepts of intrinsic random function and local station...
Article
A procedure to predict potential Cu areas in the Polish Fore-Sudetic region using structural surface-restoration and logistic regression (LR) analysis is investigated. The predictor variables are deduced from the restored horizon that contains the ore-series. Curvature attribute are calculated for each restored time after applying flexural slip to...
Poster
Full-text available
The structural complexity in a region on the earth surface directly impacts the difficulty, cost and risk associated with producing natural resources. Anticipate, within a reasonable error margin, the structural complexity in a given locality could help to define better strategies to explore and exploit a natural resource placed in that locality. B...
Article
Full-text available
The location of potentially unrecognized gold deposits in the close vicinity of the Cadillac–Larder Lake Fault Zone in the Archean Abitibi Subprovince (Canada) is predicted by applying a stochastic approach to the distribution of known gold deposits. The methodology uses the distances between neighboring orogenic gold deposits along the fault trace...
Conference Paper
This work explains a procedure to predict Cu potentials in the ore-Kupferschiefer using 4D modeling and logistic regression (LR) analysis. The predictor variables in the assessments are established from restored horizons that contain the ore-series. Applying flexural-slip to unfold/unfault the 3D model of the Fore-Sudetic Monocline (FSM), we obtain...
Conference Paper
3D restoration can help to better understand the history of geological formations, to identify fossil mineralizing fluid pathways, to establish the physical and chemical processes involved in ore formations and to predict the locations of potential economic mineral resources. In the case of sediment-hosted ore deposits, the unfolding and unfaulting...
Conference Paper
Understanding the history of sedimentary basins is of paramount importance for reconstituting oil and gas migration, but also in mineral exploration for identifying brine pathways. Advanced modeling technology such as 3&4D geomodeling can be fruitfully used to explore with new eyes old matured mining field. The Polish Kupferschiefers, a sediment-ho...
Chapter
A geostatistical approach is proposed to image the uncertainties attached to the rock moduli in a 3D geomechanical model. Then, this approach is applied to quantify the effects of these uncertainties on the calculated displacements and stresses in a geological structure undergoing depressurisation due to hydrocarbon production. It is shown that the...
Article
Full-text available
Generally the geostatistical simulation methods are used to generate several realizations of physical properties in the sub-surface, these methods are based on the variogram analysis and limited to measures correlation between variables at two locations only. In this paper, we propose a simulation of properties based on supervised Neural network tr...
Poster
Full-text available
The assessments in mineral exploration are based on models supported by descriptive and/or metallogenetic evidences and geo-variables. The potential maps to find an ore deposit are expressed as a function of the posterior probabilities when the evidences are present or not1. In other situations, the potential is the result of a linear combination o...
Conference Paper
Full-text available
3 & 4D geomodeling, a computer method for reconstituting the past deformation history of geological formations, has been used in oil and gas exploration for more than a decade for reconstituting fluid migration. It begins nowadays to be applied for exploring with new eyes old mature mining fields and new prospects. We describe shortly the 3&4D geom...
Article
Continuous media theory in physics uses the Von Karman's theory to describe the shape, strains and stresses of thin plates, non Euclidian thin shells or surfaces. Given a set of boundary conditions, it relates geometrical shape parameters such as the Gaussian and the mean curvatures, the physical properties of the materials such as the Young's modu...
Conference Paper
Full-text available
The past two decades have seen a rapid development in structural restoration as key to identify favourable target mother rock formations, to reconstitute fluid migration in oil and gas surveys and to predict faults and fracturing in the rock mass. In the case of sediment-hosted ore deposits, the restoration procedure can be used to identify mineral...
Conference Paper
The past two decades have seen a rapid development in structural restoration as key to identify favorable target mother rock formations, to reconstitute fluid migration in oil and gas surveys and to predict faults and fracturing in the rock mass. In the case of sediment-hosted ore deposits, the restoration procedure can be used to identify minerali...
Conference Paper
Full-text available
ProMine is a European Union (EU) co-funded project, focused on “Innovative concepts and processes for strategic mineral supply and for new high added value mineral-based products”. It started in 2009, for a four years period, and involves 27 partners from 11 countries. A first major result from the project is the release of the collaboratively deve...
Conference Paper
Greece’s geology favors a potent and dynamic use of mineral resources. Among the Non-Energy Metallic Minerals commodities, base and precious metals, in particular zinc, lead, copper gold, and silver are becoming an increasingly important and rapidly growing target of the mining industry. In NE Greece, where most of the potential resources and feasi...
Article
Full-text available
By compiling geological, structural, geophysical, and geochemical information into a 3D geological model, we evaluated the orogenic gold potential in the vicinity of a hidden segment of an important Archean fault zone, the Cadillac-Larder Lake fault (CLLF) in the region of Rouyn-Noranda. The segment of CLLF in the present study is partly covered by...
Conference Paper
Defining distance is crucial for modeling geological properties with geostatistics. However, geological structures are generally deformed, making the present-day Euclidean distance inappropriate for applying geostatistics. Considering this, chronostratigraphic coordinate system maps geological models into a regular chronostratigraphic space, where...
Article
Unconformity-related uranium deposits are the highest grade, large tonnage uranium resources in the world. In the Athabasca Basin (northern Saskatchewan, Canada), which is the premier host for unconformity-type deposits, the ore deposits are frequently hosted and surrounded by breccias in sandstone. The significance of these breccias and their rela...
Article
Full-text available
Streamline approach is often used as an alternative effective method to classical finite difference technique for solving large heterogeneous fluid flow models in petroleum reservoirs. In the case of complex multi-component fluid system, this approach is scarcely used because the hydrodynamic and thermodynamic flow equations are strongly coupled th...
Article
Full-text available
Natural gas hydrates may contain more energy than all the combined other fossil fuels, causing hydrates to be a potentially vital aspect of both energy and climate change. This article is an overview of the motivation, history, and future of hydrate data management using a CODATA vehicle to connect international hydrate databases. The basis is an i...
Article
Full-text available
Streamline simulators are often used as an alternative effective method to classical finite differ-ence technique for solving large heterogeneous fluid flow models in petroleum reservoirs. In the case of complex multi-component fluid system, this approach is scarcely used because the hydrodynamic and thermodynamic flow equations are strongly couple...
Conference Paper
4D Seismic is becoming a conventional tool for hydrocarbon reservoirs monitoring and management, especially for heavy oil bearing fields (Calvert, 2005). In this case, 4D, or time-lapse seismic, can be used to detect important reservoir properties variations imposed by thermal enhanced oil recovery processes. This work aims at identifying remaining...
Article
Summary Dependency of soil properties on scale is a crucial issue in soil physics. In this paper, fractal approaches are used in two case studies in France and Australia, respectively, to study how measured physical soil properties change with the sample spacing and the scale of observation. At a scale of 10–1000 m (104 to 106 mm), fractals were ap...
Article
Full-text available
Multi-attribute interpretation with discriminant analysis is an efficient tool to interpret 4D seismic data in terms of reservoir changes. Yet, because this method cannot take into account data uncertainties which are in most cases significant, the interpretation may be questionable. The following paper presents an algorithm based on interval arith...
Article
The average Pb/U ratio of the Shea Creek unconformity-type uranium deposit has been estimated at 0.071±0.015. The calculation was performed on a volume enclosing the orebody to take into account the possible radiogenic lead migration within the ore zone. Despite this precaution, this ratio is significantly lower than the expected ratio (0.211) assu...
Article
Full-text available
This paper presents our experience in applying 3D modeling for processing and visualizing geoscience's information since more than 10 years. Subsurface characterization is important in a number of geological activities including petroleum industry, waste deposit, natural resources (mineral and water), geotechnical engineering and environmental appl...
Article
In a statistical pattern recognition context, discriminant analysis is designed to classify, when possible, objects into predefined categories. Because this method requires precise input data, uncertainties cannot be propagated in the classifying process. In real case studies, this could lead to drastic misinterpretations of objects. A new nonparam...
Article
Hydraulic fracturing is a common procedure to increase the permeability of a reservoir. It consists in injecting high-pressure fluid into pilot boreholes. These hydraulic tests induce locally seismic emission (microseismicity) from which large-scale permeability estimates can be derived assuming a diffusion-like process of the pore pressure into th...
Conference Paper
In the petroleum exploration/production context, characterizing the reservoir quality, identifying the main rock types, or predicting their spatial variations is a challenge for the industry. To achieve this purpose, supervised pattern recognition methods, as discriminant analysis are widely used. These methods aim at calibrating, when possible, a...
Article
Drilling at Soultz-sous-Forêts, France, conducted as part of the European ‘Hot Dry Rock’ Project, penetrated the Rhine Graben basement down to 5090 m and revealed a porphyritic monzogranite. Chemical composition and REE patterns of three samples at 5 km depth indicate homogeneous composition with a slight vertical differentiation, suggesting stable...
Article
Drilling at Soultz-sous-Forêts, France, conducted as part of the European 'Hot Dry Rock' Project, penetrated the Rhine Graben basement down to 5 090 m and revealed a porphyritic monzogranite. Chemical composition and REE patterns of three samples at 5 km depth indicate homogeneous composition with a slight vertical differentiation, suggesting stabl...
Article
Full-text available
Deep temperature estimations are important for rheological studies of the crust and also for the planning of deep drill holes. Thermal modeling requires the input of realistic boundary conditions in order to obtain reliable values for the temperature at depth. Boundary conditions necessary for thermal models may be inferred from geochemical and geo...
Article
Stratigraphic inversion of seismic amplitudes is a widely-used technique for estimating acoustic or elastic impedances, these impedances being related to reservoir properties in a second step. For inversion processes incorporating a priori information, it is very important to weight the a priori in the cost function, consistently with the a priori...
Article
1 Fachrichtung Geophysik, Freie Universität Berlin, Malteserstrasse 74-100, Build. D, 12249 Berlin, Germany.E-mail: shapiro@geophysik.fu-berlin.de
Article
The study of the natural alteration of ancient vitreous slags (100 to 4 000 years) suggests a single global mechanism. In a first stage, weathering consists of a selective extraction of the modifier cations of glass (including Pb and Ba). This phenomenon is associated with an increase of the solution pH, inducing the glass dissolution. The elements...
Article
Full-text available
Multidisciplinary three-dimensional modelling, involving geophysical, structural and geochemical data, has been used to study the relationships between magmatism, tectonics, fluid circulation and mineralisation in the northern Limousin, and to provide P-T-Z-t paths constrained by the available dating. The ore deposit occurrence displays little spat...
Article
Full-text available
We propose an approach for in-situ estimating of the large-scale permeability tensor of reservoirs. F or this w e use the seismic emission micro-seismicity induced by borehole hydraulic tests. The approach is based on the hypothesis that the triggering front of the hydraulic-induced micro-seismicity propagates like the low-frequency second-type com...