ELECTRICAL RESISTIVITY IMAGING OF A COAL DEPOSIT AT TAI AREA OF GOMBE STATE, NORTH EASTERN NIGERIA
ELECTRICAL RESISTIVITY IMAGING OF A COAL DEPOSIT AT TAI AREA OF GOMBE STATE, NORTH EASTERN NIGERIA
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Date
2015-09
Authors
MOHAMMED, Mustapha Adejo
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Abstract
A 2-D electrical resistivity imaging of some parts of Tai in Akko Local Government area of Gombe State, northeastern Nigeria was carried out. Tai is located 28km from Pindiga and lies between latitudes 100 00′00″ and 100 06′00″N and longitudes 100 40′ 00″E and 10045′00″E. This study was prompted by a report that in the course of siting a hand-dug well and motorized borehole in Tai, coal seam was intercepted at a depth of about 18m. The aim of this geoelectrical investigation was to image the survey area for possible location and future exploitation of coal seams found in the area. The survey was targeted at determining the lateral extent of the coal seam, strike direction and resistivity values associated with the coal seams. The lund imaging system consisting of the ABEM Terrameter SAS 1000, electrode selector ES 464, stainless steel electrodes, multicore cables and jumpers was used to acquire the data in this survey. The protocol chosen was the Wenner-Schlumberger array because of its sensitivity to both horizontal and vertical structures, larger median depth of investigation and slightly better horizontal coverage. Data processing was done using RES2DINV software. The results show that the resistivity values range from 3Ωm to 2033Ωm. The top layer has resistivity ranges of about 66Ωm to 907Ωm. Below this, is a layer of low resistivity ranging from 3Ωm to 57Ωm probably saturated with water. The layer with resistivity range of 250Ωm to 900Ωm is probably the host of the coal seams. It can be concluded that the occurrence of the coal seam is probably more at the Northwest of the survey area and the coal seam is suspected to have resistivity values ranging from about 250Ωm to 900Ωm. It can also be inferred that the coal seam is striking in the Northeast-Southwest direction.
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BEING A DISSERTATION SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY,
ZARIA, NIGERIA.
IN PARTIAL FULFILMENT FOR THE AWARD OF
MASTERS OF SCIENCE DEGREE IN APPLIED GEOPHYSICS
DEPARTMENT OF PHYSICS
FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY, ZARIA
Keywords
ELECTRICAL RESISTIVITY IMAGING,, COAL DEPOSIT,, TAI AREA,, GOMBE STATE,, NORTH EASTERN,, NIGERIA