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Papers by moussa harouna

ACS Omega

This is the first study of pyrite minerals in the entire West and Central African Rift System (WC... more This is the first study of pyrite minerals in the entire West and Central African Rift System (WCARS). Several polished organic-rich core samples from the Cretaceous Yogou Formation of the Niger (Chad) Basin located in the WCARS were investigated for their pyrite content using FE-SEM and SEM-EDS imaging techniques. An attempt was made to classify the types and provenance of the pyrites and to highlight the control of rift fractures on the oxidation and dissolution of pyrites in the region. Three major types of pyrites are present in the studied formation, including euhedral pyrite (EPy) crystals, pyrite framboids (FPy), and sunflower pyrites (SPy). A statistical analysis of 307 FPy shows that the framboids are diagenetically formed with an average diameter of 6.61 μm. SPy is present in a relatively low amount compared to framboids. The pyrites underwent a variety of diagenetic modifications, from mechanical compaction to oxidation, dissolution, and recrystallization. Unoxidized pyrites primarily contain Fe, S, and C, but oxidized pyrites also contain O, Al, and Si. There is a strong correlation between the fractures and the spatial distribution of the physicochemical alteration of the pyrite in the study. Dissolution in relatively deep-buried samples occurs mainly along fracture planes. The fractures provide a pathway for oxidants and other metal elements to reach the pyrites. The pattern of pyrite dissolution reflects the timing of fracture formation and fracture activities as a purveyor or drainage for fluids in the organic-rich samples investigated. The pyrites are associated intimately with organic matter (OM); thus, the relationship between the fracture and the pyrites' transformation is significant in the assessment of organic matter preservation at deep-burial depth.

European Scientific Journal ESJ

The general objective of this study, which focuses on the geological modelling of sandstone forma... more The general objective of this study, which focuses on the geological modelling of sandstone formations and petrophysical characterization of hydrocarbon reservoirs in the Termit basin, is to build a geological model to visualize the geometry of reservoir formations. Its specific objectives are: (1) determine the extension of promising reservoir formations, (2) establish models of petrophysical parameters (porosity, permeability and saturation). The methodology implemented is based on the integration of lithological data and petrographic parameters from the logs into the Petrel software. The interpretation of the results obtained on geological modelling shows; geometry and extension of reservoir formations in the form of sand lenses of varying thickness from one prospect to another. Petrophysical parameter models including porosity and permeability models have made it possible to understand the vertical distribution of the different reservoir units.

2022 International Conference on Electrical, Computer and Energy Technologies (ICECET)

Journal of African Earth Sciences

International Journal of Biological and Chemical Sciences, 2022

La région d’étude est située en zone de socle dans la commune rurale de Torodi, partie sud-ouest ... more La région d’étude est située en zone de socle dans la commune rurale de Torodi, partie sud-ouest du Niger, où l’alimentation en eau des populations est faite à partir des eaux de surfaces et des nappes superficielles. Suite à la vulnérabilité de ces dernières, liée à la sècheresse et à la pollution, une attention plus particulière a été accordée aux eaux des nappes plus profondes à travers le fonçage des puits modernes et des forages. Cependant, des études récentes réalisées sur différents points d’eau situés en d’autres zones de socle, ont révélé d’importantes valeurs en éléments chimiques indésirables parfois même supérieures aux normes OMS. Evaluer la qualité des eaux de cette région par les analyses physico-chimiques s’avère aussi importante surtout dans ce contexte de pollution grandissante et pour une gestion rationnelle des ressources. L’approche méthodologique a consisté aux prélèvements de dix échantillons d’eau des puits et des forages pendant le mois de Mai pour les analy...

LES SEDIMENTS DU CARBONIFERE INFERIEUR DE LA REGION D'AGADES, TYPIQUEMENT MARINS AU NORD (ARG... more LES SEDIMENTS DU CARBONIFERE INFERIEUR DE LA REGION D'AGADES, TYPIQUEMENT MARINS AU NORD (ARGILITES DU TALAK), PASSENT LATERALEMENT A DES FACIES LAGUNO-LACUSTRES DANS LA PARTIE MERIDIONALE. CES FACIES RECELENT DES NIVEAUX DE CHARBON BIEN DEVELOPPES A ANOU-ARARENE ET A SEKIRET. LES SEQUENCES FLUVIO-DELTAIQUES DU GUEZOUMAN ET DU TARAT, ATTRIBUEES AU NAMURIEN-WESTPHALIEN CONTIENNENT DE LA MATIERE ORGANIQUE DISPERSEE, RESPONSABLE DE LA CONCENTRATION DE L'URANIUM. LE LINEAMENT MERIDIEN DE IN AZAWA CONSTITUE UNE STRUCTURE MAJEURE DE LA REGION. LE MOUVEMENT D'EFFONDREMENT DE SON COMPARTIMENT EST AURAIT PERMIS LA PRESERVATION DE LA MATIERE ORGANIQUE DES SERIES CHARBONNEUSES DANS LA PARTIE SUD DU BASSIN. DANS LA PARTIE NORD, CET ACCIDENT A JOUE LE ROLE D'INTERFACE CHIMIQUE ENTRE LES FORMATIONS PERMIENNES ET LES FORMATIONS CARBONIFERES AU COURS DE LA GENESE DE L'URANIUM. L'EVOLUTION THERMIQUE DE LA MATIERE ORGANIQUE DES SERIES CHARBONNEUSES EST FONCTION DE LA DIAGENESE...

International Journal of Innovation and Applied Studies, 2020

This study is a contribution to the petrographic and petrophysical characterization of the reserv... more This study is a contribution to the petrographic and petrophysical characterization of the reservoir sandstones of Yogou Formation in the Termit Sedimentary Basin (Niger). It focuses on the impact of diagenetic processes on the petrophysical properties of Campanian sandstones. The pore types are generally intergranular, intragranular, and rare microcracks. The porosity varies from 0.3% to 25.3% and the permeability ranges from 0.1 mD to 470.3 mD. Diagenetic features that influenced the reservoir quality evolution include mechanical and chemical compaction, precipitation of carbonate cement, clay mineral cement, the formation of quartz overgrowths, and dissolution of feldspar grains. Compaction and cementation reduced significant volumes of primary porosity and permeability. On the other hand, feldspar dissolution and quartz corrosion contributed to an increase in the volume of primary porosity of the sandstones. The Yogou Formation reservoir was subjected to a high diagenetic overpr...

$Research paper thumbnail of Iconographies supplémentaires de l'article : Caractérisation des analcimolites du bassin de Tim Mersoï (Nord du Niger) par diffraction des rayons X$

$Research paper thumbnail of Iconography : Caractérisation des analcimolites du bassin de Tim Mersoï (Nord du Niger) par diffraction des rayons X$

2018 IEEE/MTT-S International Microwave Symposium - IMS, 2018

An accurate analytical model for the efficiency prediction of a hybrid ambient thermal and RF ene... more An accurate analytical model for the efficiency prediction of a hybrid ambient thermal and RF energy harvester is proposed in this paper. The DC power provided by the Thermoelectric Generator (TEG) is directly influencing the operation of the RF rectification. The proposed analytical model can provide an accurately predicted efficiency performance within a low-power range « −30 dBm)., thanks to a precise separation of each harmonic and DC component generated by diode. This has been verified by comparing with results obtained by both ADS simulation and experiments. Moreover., such a hybrid ambient thermal and RF energy harvester shows an advantage over its hybrid mechanical and RF energy harvesting counterpart in terms of rectified DC output power in the low-power range of interest. This is mainly due to the instinct of DC output converted from thermal energy and its huge contribution.

Journal of African Earth Sciences, 2021

Geological Journal, 2020

Analysis of apatite fission‐track and vitrinite reflectance combined with 1‐D basin modelling was... more Analysis of apatite fission‐track and vitrinite reflectance combined with 1‐D basin modelling was used to reconstruct the thermo‐tectonic history of the northeast Sichuan Basin, China. The study indicates that the basin has evolved through multi‐phase tectonic regimes involving a series of subsidence and tectonic uplift phases exerting significant control on the thermal history. Heating and cooling processes were largely related to deep burial and intense exhumation, respectively. Exhumation that extended from 122 to 2.5 Ma has resulted in at least 4 km of sedimentary removal. The rate of exhumation and removal (denudation) was found to have reached 58 and 35 m/Myr, respectively. The results show that the denudation magnitude is significantly higher in the eastern part reaching 5.5 km, compared with 2.2 km in the western part of the study area. The fission‐track ages demonstrate the occurrence of three cooling phases: initial‐gradually increasing (~120–70 Ma), stagnant (70–15 Ma), and rapid (15 Ma to present). This suggests that cooling was associated with different compressive thermo‐structural events that began in the mid‐Lower Cretaceous (~122 Ma) marking the subsidence climax period. With the sedimentary section approximating 8‐km thickness by the time of maximum burial, the modelled average maximum temperature and vitrinite reflectivity coefficient reached roughly 232°C, and 3.5% for the Lower Triassic Feixianguan Formation (T1f1), thus indicating the conditions of dry gas generation. The Meso‐Cenozoic thermo‐structural evolution that postdated the onset of hydrocarbon generation has been critical for the evolution of the petroleum play, including the Feixianguan Formation in the marine carbonates of the Early Triassic and the Xujiahe Formation in the non‐marine sandstones of the Upper Triassic. This resulted in the modification of primary hydrocarbon accumulations, mostly in the lower petroleum play, and development of secondary accumulation in the newly formed structural traps in the upper petroleum play. Therefore, accurate thermo‐tectonic history reconstruction is valuable for understanding the geological history and hydrocarbon prospectivity.

Journal of Geoscience and Environment Protection, 2018

The study aimed at investigating the geochemistry of a sandstone-type uranium deposit in Tarat fo... more The study aimed at investigating the geochemistry of a sandstone-type uranium deposit in Tarat formation for provenance, paleo-redox, tectonic setting in order to propose a geological model of uranium. X-Ray Fluorescence (XRF) and Induced Coupled Plasma Mass Spectrometry (ICP-MS) analyses were used to determine the sandstone composition. Major, trace and rare earth element compositions of the sandstones have been investigated to determine their provenance, tectonic setting and the influence of weathering conditions. Field studies of Tarat formation revealed that a major accident N30˚ that can be interpreted as an extension of the Austriche accident ensures the controls of Tarat sedimentation and mineralization deposits and the presence oxidized zone and reduced zone indicate the direction of circulation of the mineralized fluids from West to East. The uranium mineralization is disseminated as pitchblende that gives a yellow color to the sandstone while, molybdenum mineralization gives a blue color to the sandstone. Results of the Geochemical analysis indicate that the sandstone-type uranium deposit of Taratis classified into Protoquarzite (i.e. lithearenite and sublitharenite), arkose, subarkose, wacke and quartz arenite and varied in their maturity. Their Rare Earth Elements (REE) pattern displays high light REE over heavy REE, flat HREE and a significant negative Eu and Ce anomalies and in general correlated well with the NASC and PAAS average composition. The source area may have contained quartzose sedimentary rocks. The geochemical data support deposition in reducing environment of arid to humid climatic condi

Comptes Rendus Geoscience, 2019

Located in northern Niger, the NWeSE T efidet trough is the western branch of the T en er e rift ... more Located in northern Niger, the NWeSE T efidet trough is the western branch of the T en er e rift megasystem. Here we present a tectono-sedimentary analysis of the T efidet trough, based on the combined use of satellite imagery, field observations and measures, and available literature. We use these data to analyse the sedimentary facies and the tectonic deformations (faults, folds, basins) in the T efidet trough, and derive their relative chronology. Doing so, we characterize synrift and postrift deformations and their interactions with sedimentation. Altogether our analyses suggest that the T efidet trough was affected from the Cretaceous to the Paleogene by three major tectonic periods. The first period was a rifting stage with extension and transtension during the Albiane Aptian times. The mean extension was~N60 and dominantly produced NWeSE-trending normal faults, a few strike-slip faults locally associated with small folds with sigmoidal axis and small reverse faults, and progressive unconformities. the second period was also a rifting time, which prevailed during the Upper Cretaceous. The regime was marked by transtensional to extensional tectonics, under a~N130 shortening and a~N60 trending stretching. The end of this period saw the closure of the T efidet trough. the third period was a postrift stage. It was characterized by a~N70 extensional to transtensional regime during the OligoceneePliocene. It mainly produced post-sedimentary extensional faults and fractures and alkaline volcanism. We eventually discuss these deformation phases in relation with the Cretaceous Gondwana breakup and its related rifting events in West and North Africa, and with the subsequent AfricaeEurope collision.

Http Www Theses Fr, 1991

SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : T 82421 / INIST-CNR... more SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : T 82421 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Bulletin de la Société Géologique de France, 2016

The Téfidet trough (eastern Niger) belongs to the Ténéré megasystem set of Cretaceous rifts N130°... more The Téfidet trough (eastern Niger) belongs to the Ténéré megasystem set of Cretaceous rifts N130°E to N170°E oriented, corresponding to the direction of the Lake Chad-Hoggar tectonic axis.The study of the relationship between the structure of the trough and alkaline fissural volcanism that developed there from the Oligocene to Plio-Quaternary shows the uniqueness of the Téfidet trough compared to the neighboring contemporary volcanic areas of Hoggar, Cameroon, and southern Aïr.The tectono-magmatic reactivation of the Cretaceous Téfidet trough developed in two steps: – a period contemporaneous with the Tuareg shield bulging (Aïr, Hoggar, Iforas);– a subsequent extension period generally N060°E, which has persisted since the opening of the South Atlantic (upper Jurassic to Plio-Quaternary).The fissural volcanism, due to the reactivation of Pan African and Cretaceous faults evolved concomitantly with the N060°E extension (syn-magmatic micro-fractures with basaltic filling), in several ...

Energy Procedia, 2015

The present paper is about a preliminary study of the georesources of Niamey (Niger). The main go... more The present paper is about a preliminary study of the georesources of Niamey (Niger). The main goals are the qualitative and quantitative characterization of surface water, groundwater, and aggregates. There was a census of the wells and quarries, an in situ characterization and a consequent sampling survey. Laboratory analyses were performed to evaluate chemical and physical features of water and aggregates. Thanks to a dedicated Geodatabase, schematic forms reporting the available data of wells and quarries were produced. The study evidenced the actual condition of surface water, groundwater and active and closed quarries, also highlighting local phenomena of pollution.