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Borehole Siting in Crystalline Basement Areas of Nigeria with a Microprocessor‐Controlled Resistivity Traversing System
Author(s) -
Olayinka Abel,
Barker Ron
Publication year - 1990
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1990.tb02244.x
Subject(s) - traverse , borehole , geology , electrical resistivity and conductivity , basement , mining engineering , mineralogy , geotechnical engineering , geodesy , engineering , civil engineering , electrical engineering
A Microprocessor‐controlled Resistivity Traversing (MRT) System using the Wenner configuration has been developed to measure the distribution of resistivity in the subsurface down to depths of 200 m. The data are presented as a contoured apparent resistivity cross section, a type of electrical image, from which useful information about the structure of the subsurface can be obtained. Quantitative interpretation consists of iterative computer modeling using a two‐dimensional finite‐difference method. Measurements conducted in Kwara State, Nigeria, in borehole siting surveys show that MRT surveys are an important aid in locating areas of deep weathering and fissure zones in structurally complex basement areas. The resistivity information obtained allows an appreciation of the subsurface structure which cannot be obtained easily with other geophysical techniques.