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The study was done in the portion of Anambra Basin that stretches into Edo State, covering Esan west, Esan central, and Esan north east. The study was done with the aim of identifying occurrence of deformational structures in Esan part of Anambra Basin, the origin of the structures, and their economic importance in the area. Detailed geological and...
Contexts in source publication
Context 1
... study area falls within the portion of Anambra Basin that extends to Edo State. It covers Esan west, Esan central, and Esan north east ( Figure 1). Deformational structures are structures formed by geological processes that have taken place in the time past or that are taking place in the present time. ...
Context 2
... the result of 2D resistivity imaging along transverse 2 (Figure 3), gives monoclinic image (Figure 9), uniformly dipping beds in one direction. Transverse 3 and 4 show that the results of the 2D resistivity survey along the transverses have images that reflect break or discontinuity in lateral continuity of subsurface strata (Figures 10 and 11). ...
Context 3
... presence of springs, wetlands, artisanal wells and offset streams in some portions of the study area as observed during the geological study gives evidence of fault occurrence in Esan land. Lateral discontinuity signature in the 2D resistivity imaging along transverse 3 and 4 ( Fig. 1.9 and 1.10) indicates the presence of fault in the study area. This observation corroborates the occurrence of deformational structures in the Esan portion of Anambra ...
Context 4
... presence of fold at the outcrop section exposed at Uvue in Uromi, gives evidence of fold in the study area. The image of homoclines structures ( Fig. 1.8) along transverse 1 confirms occurrence of fold in the Esan axis of Anambra Basin. The manner and the signature of the homoclines image ( Fig. 1.8) shows that the folds are closed and tight folds. This indicates that the folds have been intensely deformed. The presence of faults and folds attests to the fact that deformational ...
Context 5
... presence of fold at the outcrop section exposed at Uvue in Uromi, gives evidence of fold in the study area. The image of homoclines structures ( Fig. 1.8) along transverse 1 confirms occurrence of fold in the Esan axis of Anambra Basin. The manner and the signature of the homoclines image ( Fig. 1.8) shows that the folds are closed and tight folds. This indicates that the folds have been intensely deformed. The presence of faults and folds attests to the fact that deformational structures occur in Esan land axis of Anambra ...
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Citations
... Hence, Two Dimensional Electrical Resistivity Tomography was employed in studying the lithologic section of the subsurface in the study area, with the intention to delineate any deformational structures of the area. This became necessary after a previous work by Salufu and Ujuanbi (2015) on identifying occurrence of deformational structures in Esan Land. This paper deals with distortions of various primary sedimentary structures and deformed bedding that may have taken place at a time of or shortly after deposition of the sediment. ...
In this study, Electrical Resistivity Tomography (ERT) technique was used to investigate and delineate the presence of deformational (geologic) structures within the lithological section of the study area as well as the origin of such structures. Three (3) traverses were investigated within the area with traverse 1 taken in the N-S direction measuring 200 m while traverses 2 and 3 were taken in the W-E direction measuring 150 m each. The geographical coordinates of the study area are within 6o 44′19.1′′ N to 6o 44′ 26.1′′ N and 6o 5′67.6′′ E to 6o 5′76′′ E. The two dimensional (2D) ERT data obtained were processed and inverted to generate subsurface model of the study area. Traverse 1 with resistivity distribution values which ranged from 78 - 10713 Ωm has at the centre two significant geologic structures; folds and faults. Traverses 2 and 3 showed only folds. The two structures were restricted to the north eastern part of the study area. The structures which are localized and non expansive must have been formed by unequal loading of the overlying strata, which led to the build up of stress on the underlying rock units. The occurrence of the deformational structures in the study area are indicative of potential hydrocarbon accumulation and surface water.
