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Geoelectric Investigation for Groundwater Exploration in YaoundéArea, Cameroon

International Journal of Geosciences 2012年第3期3卷 640-649页

作者： William Assatsé. Teikeu philippe nouck njandjock Théophile Ndougsa-Mbarga Tabod Charles Tabod Department of Physics Advanced Teachers’ Training College University of Yaounde I P.O. Box 47 Yaounde Cameroon Department of Physics Faculty of Science University of Yaounde I P.O. Box 812 Yaounde Cameroon

Yaounde zone is originally characterized by the small number of aquifers and bad renewal capacity. Within the frame-work of the emergency program which aims at supplying the city with drinking water, seventeen Vertical Electrical Soundings (VES) were carried out using Schlumberger configuration in parts of Yaounde (latitude 3o- 5oN and longi- tude 11o-13oE) to determine the nature and thickness of aquifer zone and necessary geoelectrical parameters. Four to five geoelectric layers were delineated from the survey area. The first layer is the topsoil and has resistivity values ranging from 13 - 216 Ω·m and thickness is between 0.1 - 6 m. The second layer made up of clay sand and laterite has resistivity values ranging between 23 and 923 Ω·m and thickness ranged from 1 and 40 m. The third and fourth geoelectric layers consisting of clay and gneiss/migmatite with thickness varying from 1.7 - 63.3 m correspond to an aquifer horizon. Resistivity values of the aquifer ranges from 4 to 9215 Ω·m. The study indicates that average depth of the aquifer is 20 m and average thickness of the aquifer is 55 m. Soundings curves suggest several four layered geoelectrical sections KH, KQ, HK type and some five layered sections of the HKH, KHK types. KH type is dominant and can be used as reference for future studies. The resistivity survey reveals that the parameters obtained through interpretation of VES curves corroborate the litho logs of boreholes from the area.

关键词： Aquifer Geoelectrical Section Vertical Electrical Sounding (VES) Yaoundé

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Hydrogeophysical Parameters Estimation for Aquifer Characterisation in Hard Rock Environment: A Case Study from Yaounde, Cameroon

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Journal of Water Resource and Protection 2012年第11期4卷 944-953页

作者： William Assatsé Teikeu philippe nouck njandjock Dieudonné Bisso Quentin Yene Atangana Jean-Paul Sep Nlomgan Department of Earth Science University of Yaounde I Yaounde Cameroon Department of Physics Faculty of Science University of Yaounde I Yaounde Cameroon National Institute for Geologic and Mining Research Yaounde Cameroon

Detailed local geological and hydrogeophysical investigations were carried out for the aquifer in Yaoundé, Cameroon to delineate the architecture of different subsurface geological horizons using lithologs and generated vertical electrical sounding (VES) data. An attempt has also been made to estimate aquifer transmissivity from resistivity data. The transmissivity of the uncon?ned aquifer was computed by determining the Dar-Zarrouk parameters (longitudinal unit conductance and transverse unit resistance) and were compared with the actual field transmissivity. The results showed a direct relation between aquifer transmissivity and transverse resistance. The relationship established has therefore, been generalized in the study area in order to evaluate hydraulic conductivity and transmissivity at all the points where geoelectrical measurements have been carried out. This generalization allows one to derive maps of the product Kσ and transmissivity in the study area based on geoelectrical measurements. These maps are important in future modelling processes oriented towards better exploitation of the aquifers.

关键词： Hydrogeophysical Transmissivity Hydraulic Conductivity Yaounde

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Electrical and Geological Investigations to Conduct Petrophysical Study in Douala-Cameroon Sedimentary Basin

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Open Journal of Geology 2013年第4期3卷 273-277页

作者： philippe njandjock nouck Dieudonné Miyem Aristide Binyam-bi-Mpeck Quentin Yene Atangana Simon Ngos Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon

Electrical and geological methods are used to conduct petrophysical study in Douala-Cameroon sedimentary basin along Yaounde-Douala National road No. 3. Studies in this region are made of three outcrops, namely: Missolè II located on the sedimentary basin of Douala, Edea and Sikoum which are outcrops of basement rocks that form the eastern boundary of the sedimentary basin of Douala. This study reveals that the rocks of the sedimentary basin of Douala are mainly composed of sandstone and clay. Both basement rocks of Edea and Sikoum are subjected to the same phases of deformation. These phases of deformation give the quartzite a particular structure that greatly influences the resistivity and density of these rocks and give it a planar anisotropy.

关键词： Resistivity Petrophysic Douala Sedimentary Basin Edea

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Water Infiltration Study from Magnetotelluric Data in the Limestone Fault Network of Mintom (South Cameroon)

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International Journal of Geosciences 2015年第9期6卷 1007-1017页

作者： Harlin L. Ekoro Nkoungou Daniel H. Gouet philippe njandjock nouck Eliézer Manguelle Dicoum Department of Physics Faculty of Science University of Yaounde I Yaounde Cameroon International Institute for Water and Environmental Engineering Ouagadougou Burkina Faso Institute of Mining and Petroleum Industries University of Maroua Maroua Cameroon

Magnetotelluric surveys have been conducted in the Mintom area in order to evaluate the water infiltration potential of the Dja river in a limestone deposit estimated at about 350 million?m3 laying on a network of faults compromising the exploitation of this limestone deposit. The interpretation of these data shows that this network of faults is clearly highlighted as 2D/3D structures consolidated showing a low potential water infiltration through these structures. This result is confirmed by the absence of confined and induced aquifer along all the profiles. From this finding, we concluded that the exploitation of this deposit is not conditioned by the water infiltration from the Dja River.

关键词： Limestone Fault Network Water Infiltration 2D Magnetotelluric Inversion

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Depositional and Structural Styles in the Logone Birni Basin (LBB), Northern Cameroon, from 3D Potential Field Modeling: Preliminary Results

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Open Journal of Geology 2019年第4期9卷 226-244页

作者： Elad Mkoumbe Fosso Téguia M. Estelle Eric Eyike Yomba Albert njandjock nouck philippe Tabod Charles Tabod Department of Physics Faculty of Science University of Douala Douala Cameroon Branch for Geophysical and Volcanological Research/Institute of Geological and Mining Research Buea Cameroon Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon

A three-dimensional model of the Logone Birni Basin (LBB) is presented by combining gravity and magnetic data and constrained by broad seismic profiles. The 3-D model has revealed the distribution of the stratigraphic formations as well as the top basement variation. Detailed structure of different stratigraphic sequences is presented for the first time for this basin and some of the sequences correlate with established sequences of the neighboring basins. The sediments pill consists of six sedimentary units dating from the Neocomian to the Quartenary. The Makary subbasin or Northern Logone Birni Basin (NLBB) is the deepest part of the basin and may hold good prospect for hydrocarbon generation and accumulation. However, the limited presence of faults and intrusive bodies decreases the possibility of thermal degeneration, contrary to the Central Logone Birni Basin (CLBB) where conditions seem to be fulfilled for possible hydrocarbon generation and maturity. The complexity of the structural pattern of the model is further enhanced by the presences of volcanic bodies, some of which lay directly on basement or interbedded with the sediments layers mainly in the CLBB.

关键词： Gravity/Magnetic Anomalies Stratigraphic Sequences Sediment Thickness Logone Birini Basin 3D-Model

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Geophysical Contribution for the Determination of Aquifer Properties in Memve Ele, South Cameroon

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Journal of Water Resource and Protection 2012年第10期4卷 885-890页

作者： Harlin L. E. Nkoungou philippe N. nouck Dieudonné Bisso Stéphane Assembe Eliézer M. Dicoum Department of Earth Sciences Faculty of Science University of Yaounde I Yaounde Cameroon Department of Physics Faculty of Science University of Yaounde I Yaounde Cameroon

This article aims to localise aquifer and to estimate hydraulic parameters such as transmissivity and tranverse resistance in the Memve Ele dam site (26.35 km2) in South-Cameroon region, using audiomagnetotelluric (AMT) method. For this purpose, resistivity data are collected at twenty-two measurement stations distributed along two perpendicular profiles in the study area. The sounding curves of phase and impedance are modelled and interpreted. The geological models and geoelectrical sections are also provided. The transverse resistivity and transmissivity field maps are plotted. The audiomagnetotellurics insights have been compared with boreholes. All these results allow us to localise the area which may be suitable to set up monitoring wells.

关键词： Hydraulic Parameters Aquifer Audio-Magnetotelluric Method Sounding Curves Memve Ele

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