Resistivity methods used in horizontal and vertical discontinuities in the electrical properties of the ground water detection
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Resistivity
methods used in horizontal and vertical discontinuities in the electrical
properties of the ground water detection
Chapter One:
Introduction
The
resistivity method is used in the study of the horizontal and vertical
discontinuities in the electrical properties of the ground and also in the
detection of three dimensional bodies of anomalous electrical conductivity. In
the study of ground water movement in obubra area, the the resistivity method
commonly employed are the electrical resistivity method. Electrical resistivity method is one of the
most useful techniques in groundwater geophysical exploration, because the
resistivity of rocks is sensitive to its ionic content (Alile, et al., 2011).
The method allows a quantitative result to be obtained by using a controlled
source of specific dimensions. Records show that the depths of aquifers differ
from place to place because of variation in geo-thermal and geo-structural
occurrence (Okwueze, 1996). Therefore, the need to study the area for
groundwater potential especially in
terms of determining the flow direction is a prerequisite for portable ground
water exploration and exploitation in this area.
1.1 Location And Geology Of The Area
The study
area lies between latitudes 50 15′ and 60 15′N and longitudes 70 45′ and 80
45′E. It is located within the sub-equatorial climatic region of Nigeria with a
total annual rainfall of more than 300 to 400cm. Temperature ranged from 250C
to 280C. The area experiences two seasons, these are the wet season which lasts
from April to September with a peak in June and July while the dry seasons
lasts from October to March (Iloeje,1991).
The study area is underlain by two major
lithologic units: Crystalline basement and Cretaceous sediments. The
crystalline basement rocks occupy the extreme south of the study area. Also,
there are intermediate rocks scatteredin patches around Obubra, Iyamayong, Iyamitet,
Ikom, Nkpani and Usumutong. The Cretaceous sediments cover about 90% of the
study area. Asu River Group is the basal and oldest recorded sediment in the
study area. It is dominated by bluish gray/black to olivine brown shale and
sandy shale, fine - grained micaceouscalcareous sandstone and siltstone with
limestone lenses. The shale is often carbonaceous and pyritic which indicates
that the sediments were deposited under a poorly oxygenated shallow water
environment of restricted circulation, an indication of low energy environment
(Petters et al., 1987). In general, Southern Obubra lies within the Cross River
plain and the clastic beds in the study area can be ascribed to the Ezillo
Formation. The Ezillo Formation comprises mostly dark gray shales with fine
sandstone and siltstone intercalations in the lower part, and an upper unit
that is highly bioturbated, fine medium sandstone, similar to the sandstone of
the Amaseri Formation. The Ezillo Formation between Appiapum and Ikom was
deposited in a deltaic coastal plain, in brackish marshes and
inter-distributary bays (Barth, et al., 1995). A major river (Cross River)
exists in the study area into which minor streams empty their loads. The
elevation of the study area ranged from 14 to 170m above sea level. The relief
is characterized by undulations running at undefined direction and variably
demarcating the very lowland areas from moderate relief landmarks. The
occurrence of the low plains is occasionally broken by inselbergs of granite
and basalts in the southern portion of the study area. In the sediment filled
portions, the low plains are occasionally broken by flat -topped hills of sandstone ridges and igneous
intrusive with highly ferroginized sandstones with gravels resulting from
uplifts. The area is drained by the Cross River with major tributaries like,
Udip, Ukong, Lakpoi, Okwo, and Okpon rivers. These rivers form a network of
dendritic drainage system
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