La construction de modèles 3D et leur utilisation demeurent répandues dans le domaine de la géologie. Cela peut être expliqué, entre autres, par la diversité des données à disposition et les nombreuses étapes à réaliser afin de construire un modèle 3D valide et cohérent par rapport à son utilisation. Afin de pallier ce déficit au sein de la CML, ce projet d'étude a été mené dans un contexte particulier. En effet, la minéralisation manganésifère de la mine de Lauzoua est de très faible épaisseur (8 à 13 m) contrairement aux autres mines dans le monde. De ce fait la mine de Lauzoua est exploitée sous forme de carrière. Les projets avancés s'arrêtent donc à l'étape des puits et tranchées. Les tables de données pour la modélisation sont donc des données issues des puits de prospection et non de sondages. Les données sont entre autres l'identifiant du puits, les coordonnées (X, Y, Z), les épaisseurs échantillonnées et les résultats d'analyse géochimiques (teneurs en Mn). Les tables ont été utilisées pour créer un modèle solide puis validé. Les ressources ont été estimées par trois méthodes d'interpolation à savoir le krigeage, la méthode du plus proche voisin et la pondération inverse de la distance. Les tests statistiques ont permis de retenir l'estimation faite par le krigeage ordinaire, soit 559411T de minerai d'une teneur moyenne de 29,44%. La modélisation permet de réduire les coûts d'exploration et d'exploitation des gisements. Ensuite, elle contribue à réduire les risques financier et matériel. Enfin, elle permet une meilleure planification des opérations d'extraction. C'est un outil d'aide à la prise de décision.

Samples from two wells implanted at the level of the dark gray clay outcrop of Bingerville were the subject of this palynological study. The main objective of this work is to inventory all the palynomorphs encountered, to propose a local palynostratigraphy and to reconstitute the paleobotany of our study area during the Tertiary formations north of the lagoon fault. The samples were processed according to the classical procedure of extraction and concentration of palynomorphs. The high populations of dinocysts of the genus Lejeunecysta lata, Opreculodinium centrocarpum and Selenopemphix quanta as well as those of spores and pollens of the genre Magnastriatites howardii, Perfotricolpites digitatus, Pachydermites diederixi, Bombacacidites bombax, Retitricolporites irregularis, Retitriporites sp. Verrucatosporites usmensis are tributary to Oligocene. At the palaeobotanical and palaeoecological level, the highlighted palynoflora made it possible to characterize three environments, including mangroves, coastal plain, and rainforests.

About 239 samples of cuttings from two boreholes located in Dabou were the subject of sedimentological studies (lithological, granulometric and morphoscopic analysis) in this work. These studies aim to identify the origin of these sediments and to specify the factors and the phenomena which involved in their transport and their deposit during Tertiary-Quaternary. After a detailed lithological description of each sample, the sandy fractions were treated according to conventional particle size methods. The formations traversed in the two wells consist of lateritic clays, yellow clays, clay sands and coarse sands. The analyzed sands are coarse and testify to the différents variations in the energy of the stream that transported the sediments. The hyperbolic granulometric facies is dominant in the study area, indicating a variation in streamflow during sedimentation. The predominantly round to sub-round quartz grains suggest a relatively distal supply source while their blunted blunted appearance suggests a stay in the aquatic environment. The sediments of these two wells are therefore sands of fluviatile origin, deposited in a shallow marine environment.

The logging and petrophysical study of four oil wells, MSP1, MSP2, MSP3 and MSP4 from San-Pedro margin of the Ivorian sedimentary basin has made it possible to evaluate the reservoir characteristics of the Cenomanian-Santonian age formations. Lithostratigraphically, this study has shown that this interval consists of clay and sandstone deposits interspersed with frequent past carbonate. At the logging, ten (10) sandstone reservoirs are highlighted with effective porosities ranging from 16% to 21% and permeabilities from 100 mD to 1100 mD (millidarcy). These reservoirs have very good petrophysical characteristics however their high water saturation show that they are rather aquifers. The various log gamma ray profiles of the intervals considered highlight a fluvial and marine deposition environment. Sedimentation would have started in a René et al.; AJEE, 10(1): 1-21, 2019; Article no.AJEE.50725 2 Cenomanian-type fluvial environment and would have continued in a marine environment marked by the accumulation of sandstone and clay under the influence of transgression and regression phases in the Turonian and Lower Senonian. Original Research Article

Morphoscopic and exoscopic analysis of quartz grains collected on the Ivorian beaches of the gulf of Guinea between Abidjan (Côte d'Ivoire) and Aforenou (Ghana) during topographic surveys between March 2007 and March 2009 on the examination of quartz at the binocular loupe, reveals blunting grains shining on all beaches (50% to 70%). In Abidjan area, the majority of the grains are reddish, indicates a ferrous and inherited environment. The exoscopy for the fine and detailed study of the morphology and the surface of the quartz grains was made with the Scanning Electron Microscope (SEM). This approach makes it possible to interpret traces related to events (energy level) or environments (transport, transition and storage environments). These observations indicate that the quartz after a long transport in a fluvial environment have been reworked in a marine environment. They were finally deposited in a low-energy aquatic continental medium marked by the polishing of the crystalline points and the siliceous corpuscles dotting the surface of the grains. The energy of the transport environments crossed is high in a turbulent environment through traces of shock, as large and numerous as they are. SEM examination of the samples reveals that beach quartz has generally been transported by river and recovered in an intertidal and/or subtidal environment. They have a continental and marine origin.