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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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Geoelectrical Inversion Study of Limestone Attributes at Mayo Boki Area (Northern Cameroon)

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International Journal of Geosciences 2014年第8期5卷 816-825页

作者： Theophile Ndougsa-Mbarga Quentin Yene-Atangana Joseph william teikeu assatsé Arsène Meying Pactrick Assembe Stéphane Department of Earth Sciences Faculty of Science University of Yaoundé I Yaoundé Cameroon Department of Physics Advanced Teachers’ Training College University of Yaoundé I Yaoundé Cameroon Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon School of Geology and Mining Exploitation College University of Ngaounderé Ngaounderé Cameroon

A geoelectrical survey using the electrical resistivity method was carried out in the Mayo Boki (Northern Cameroon), to investigate the subsurface layering and evaluation of the limestone characteristics. In addition to geological data collection, three vertical electrical soundings and one electrical resistivity profile were measured. Joint interpretation of the DC data allows us to obtain reliable 1D models of the resistivity distribution. The interpretation of the field data was carried out using the RES2DINV software, which converts the apparent resistivity as a function of electrode spacing to the true resistivity as a function of depth in two dimensions. The results obtained from the electrical resistivity survey showed that: 1) A limestone layer was put in evidence at a depth of 4 m and the thickness varies from 13 m to 44 m;2) The limestone layer resistivity is ranged from 125 to 2410 ohm.m;3) An area of probable limestone deposit with interesting thicknesses have been identified. These facts are useful for future mining exploration as drilling map definition and operations. The geologic section of a nearby location termed resistivity profile was delineated and its total depth was found to be 57 m, which corroborates the lithologs of the boreholes from the area. The correlation of geological data and the geoelectric section has led to envisage pursuing exploration activities. Based on the limestone layer characteristics extracted from this DC investigation, the exploration drilling operations have to be initiated in order to define the limestone resource over the area of study, which will certainly enables to built the exploitation project prefeasibility document.

关键词： Geoelectrical Method 1D Model Resistivity Limestone Mayo Boki Cameroon

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