TITLE:
Integrated Geophysical and Geological Mapping of the Lithological and Geological Structures at a Proposed Generator Site
AUTHORS:
Akwasi Acheampong Aning, Vandycke Sarpong Asare, David Dotse Wemegah, Reginald Mensah Noye, Kwasi Preko, Sylvester Kojo Danuor
KEYWORDS:
Electrical Resistivity Tomography, Seismic Refraction, Borehole, Subsurface, Mapping
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.7 No.12,
December
17,
2019
ABSTRACT: The discovery of oil in commercial
quantity in Ghana has led to increase in infrastructural development to provide
the needed services to the oil industry. The siting of these industries
requires the characterization of the subsurface to determine its suitability to
host these facilities. It is in this line that seismic refraction and
geo-electrical surveys were conducted on a site near Takoradi, Ghana that has
been planned to host a generator and its appurtenances for the oil industry.
The objective of the survey was to provide subsurface information critical for
the design of earthing system for the proposed generator plant and its
appurtenances. The ABEM SAS4000 Terrameter with the Lund imaging system and a
24-channel ABEM Terraloc MK6 were respectively used for the electrical and
seismic refraction data collection. The seismic refraction and resistivity
results identify three lithological units namely, dry gravel, sand and silty
clay layer, water saturated sand and silty clay layer and granodiorites
basement rocks. The first layer has a thickness of 10 m and the second layer
with thickness in the range of 5 to 10 m. The lithological classifications as
obtained from these results correlate with the drill logs. Electrical grounding will be suitable at a depth of
10 m beneath resistivity profile two at a distance between 32 to 52 m.