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Lafia
INTRCDUCTICN The area under investigation is about 48 km The location is shown in fig. 1. The Obi Coal deposit, which is within the area, has been considered as a possible source of cokeable coal to supply the Nigeria's first Steel Complex at Ajaokuta. The important role that this deposit could Play in the economy of the country necessitated a thorough investigation which was started by Nigerian Steel Development Authority (N.S.D.A.) in 1973. Previous work in this area includes the general regional geological mapping by the Geological Surveys of Nigeria as far back as 1911. Out or the recent most important investigations it will be necessary to mention the work of Olfodile (1976) on Stratigraphic Correlation of the Benue Trough which includes the area being currently investigated. With the exception of the N.S.D.a.,none of the previous workers did any geotechnical work in the area. This paper covers mainly the geotechnical investigation with the view of knowing the engineering properties of the sub-coal strata and making valuable deductions for the mining conditions of the coal deposit. Hence, the volume of the present work includes, substantially, borehole drilling and laboratory testing. A total of 131 boreholes have been sunk,. 50 of which were for detailed engineering investigations and over 250 samples were collected for various laboratory tests. BRIEF GEOLOGIC SETTING The Obi coal deposit is within the southern boundary of the piedmont of the Jos Plateau. The geomorphology is rather simple with undulating terrain. The drainage 18 generally dendritic and the main rivers are Guma, Ma, Asu, Okpagada and Dep. They all flow southwards to the River Benue about 80km from the area. Slightly north of Obi village there is a big watershed with Dadere village almcst at the centre of it. From regional geological point of view, the area investigated forms part of the Benue valley which is generally accepted to have been associated with the rifting of the south Atlantic about Jurassic-Cretaceous (Reyment and Tait, 1972. The site geology of the area investigated is similarly complex. The lithology is generally of Cretaceous Sediments (Shale, sandstone, siltstone and limestone). At least four formations have been recognised as:Keana Formation, Ezeaku Formation Awgu Formation and Lafia Formation (Ckeudo & Oki, 1978). Within the Awgu Formation there are occurrences of coal seams which have been subdivided into upper and lower coal measures (Table- 1). These sedimentary deposits have been considerably folded and faulted, a tectonic episode which took place during the opening of the South Atlantic. The folding patterns conforms with the regional folds. The azimuth of folding is generally 40°–70°. The angles of dip are averagely low for most of the folds (10°–15° for Giza syncline). The Giza anticline which is symmetrical has one of its limbs angles between 40 and 50°. The area is affected by numerous faults which are mostly subsurface and are picked up by geoelectric sounding. Thirty five of such faults have been recognised. The faults etrilaebetween 95° and 100° azimuths.
aquifer, coal deposit, coal seam, compressive strength, core sample, discontinuity, engineering property, fracture, host rock, investigation, Lafia, metals & mining, Nigeria, pre-mining consideration, Reservoir Characterization, sandstone, shale, Siltstone, strength, structural geology, Upstream Oil & Gas
Country:
- Africa > Nigeria > Nassarawa > Lafia (0.63)
- Africa > Middle East > Egypt > Giza Governorate > Giza (0.45)
SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
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