Behaviour of fractures in hard rocks — A study by surface geology and radial VES method

Mallik, S. Basu; Bhattacharya, D.P.; Nag, S. K.

doi:10.1016/0016-7142(83)90063-7

Cited by 31 publications

(19 citation statements)

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“…The Dar-Zarrouk parameters are obtained from the first order parameters (geoelectric parameters) which are Total longitudinal unit conductance (S), Total transverse unit resistance (T), and coefficient of anisotropy (λ). Electrical anisotropy is a measure of the degree of in homogeneity (Billings, 1972;Maliek et al, 1973) in a basement terrain; which arises from near surface effects, variable degree of weathering and structural features such as faults, fractures, joints, foliations, and beddings. These in turn are responsible for creating secondary porosity (Φ s ) and hence effective porosity (Φ e ).…”

Section: Methodsmentioning

confidence: 99%

Evaluation of groundwater potential and aquifer protective capacity assessment at Tutugbua-Olugboyega area, off Ondo road, Akure Southwestern Nigeria

Ayuk¹,

Adelusi²,

Adiat³

2013

Int. J. Phys. Sci.

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A total of thirty-two (32) vertical electrical sounding (VES) data were acquired using R 50 d.c. Resistivity meter within the Precambrian basement geology of part of Akure metropolis southwestern Nigeria. The VES data were interpreted; eight type curves were identified, from the geoelectric section the subsurface was characterized into four lithologies namely topsoil, weathered layer (clay /lateritic clay), weathered / fractured basement and bedrock. Thus, two major aquifers were mapped these are weathered/partially weathered layer and weathered basement/fractured basement aquifers. These aquifers are characterized by thick overburden, found within basement depressions and exhibit moderate to relatively high values of coefficient of anisotropy, λ, (0.97-1.11) with depth. Also, ancient river channel trending approximately NE-SW was mapped. The assessment of the materials above the aquifers showed that longitudinal conductance (S), values ranged from 0.0035 to 0.17 mhos; thus the S values are generally low suggesting that the materials above the aquifers are loose and porous thus having less capacity to protect aquifers in the study area. Thus the aquifers are poorly protected, and by implication vulnerable to infiltration.

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Section: Methodsmentioning

confidence: 99%

Evaluation of groundwater potential and aquifer protective capacity assessment at Tutugbua-Olugboyega area, off Ondo road, Akure Southwestern Nigeria

Ayuk¹,

Adelusi²,

Adiat³

2013

Int. J. Phys. Sci.

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“…RVES is a modified resistivity technique wherein the magnitude, intensity and direction of electrical anisotropy are determined. This method has proved very successful in the delineation of subsurface geology and structures, especially for effective identification, behavior and delineation of fracture orientations in the shallow (about 100 m) subsurface of crystalline basement terrains [2,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydrogeological Structures of Paiko Region, North-Central Nigeria Using Integrated Geophysical and Remote Sensing Techniques

et al. 2017

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Aeromagnetic data coupled with Landsat ETM+ data and SRTM DEM have been processed in order to map regional hydrogeological structures in the basement complex region of Paiko, North Central Nigeria. Lineaments were extracted from derivative maps of aeromagnetic, Landsat ETM+ and SRTM DEM datasets. Ground geophysical investigation utilizing Radial Vertical Electrical Sounding (RVES) was established in nine transects comprised of four sounding stations which are oriented in three azimuths. Source Parameter Imaging (SPI) was employed to map average depths of structures from aeromagnetic dataset. Selected thematic layers which included lineaments density, lithologic structure, slope, drainage density and geomorphologic maps were integrated and modeled using ArcGIS to generate a groundwater potential map of the area. Groundwater zones were classified into four categories: Very good, good, moderate and poor according to their potential to yield sustainable water to drilled wells. The results from RVES survey reveal a close correlation to lineaments delineated from surface structural mapping and remotely sensed datasets. Hydrogeological significance of these orientations suggest that aeromagnetic data can be used to map relatively deep-seated fractures which are likely to be open groundwater conduits while remotely sensed lineaments and orientations delineated from the RVES survey may indicate areas of recharge. Regions with high lineament density attributable to thick regolith and highly fractured basement have better groundwater potential. Drill depths in this area should target a minimum of 80 m to ensure sufficient and sustainable supplies to drilled wells. The outcome of this study would act as information framework that would guide the siting of productive water wells while providing needed information for relevant agencies in need of data for the development of groundwater resources.

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“……………………… (1) …………………… (2) …………………... (3) where hi is the layer thickness, is layer resistivity while the number of layers from the surface to the top of aquifer, (i) varies from 1 to n. Electrical anisotropy is a measure of the degree of earth's inhomogeneity [14], [15]. In a typical basement terrain, this electrical effect is due to near surface features such as variable degree of weathering and structural features like faults, fractures, joints, foliations and beddings.…”

Section: Materials and Methods Of Studymentioning

confidence: 99%

Geoelectric Investigation of Aquifer Vulnerability within Afe Babalola University, Ado –Ekiti, Southwestern Nigeria.

Ogungbemi¹

2013

IOSR-JAGG

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Behaviour of fractures in hard rocks — A study by surface geology and radial VES method

Cited by 31 publications

References 0 publications

Evaluation of groundwater potential and aquifer protective capacity assessment at Tutugbua-Olugboyega area, off Ondo road, Akure Southwestern Nigeria

Evaluation of groundwater potential and aquifer protective capacity assessment at Tutugbua-Olugboyega area, off Ondo road, Akure Southwestern Nigeria

Investigation of Hydrogeological Structures of Paiko Region, North-Central Nigeria Using Integrated Geophysical and Remote Sensing Techniques

Geoelectric Investigation of Aquifer Vulnerability within Afe Babalola University, Ado –Ekiti, Southwestern Nigeria.

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