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- W2188697344 abstract "The main objective of this research is to constrain the earlier results from the works of Ademilua (2007) and Ademilua and Olorunfemi (2010) on modeling and interpretation of the parametric VES with borehole lithological logs as a further step to confirm the validity or otherwise of the earlier works as a means of offering good resolution to the detectability question as regards the basement transition zone. This is because the zone, which has remarkable significance in hydrogeological as well as engineering construction concerns, has the tendency to be suppressed on the Vertical Electrical Sounding (VES) curve due to its intermediate resistivity and often thin thickness. The research approach has been to obtain fifteen VES datasets from locations that have been drilled and with accompanying borehole driller‘s logs. The resulting parameters from the analyses of the VES and borehole records were used as field tests for the observations and results from the earlier works. In carrying out the analyses, the field VES data were plotted into field sounding curves using the developed forward modeling software BABRES 1.0. The curves, as usual, were studied for signatures of the transition zone. The drag lengths were measured and recorded for curves displaying evidence of the transition zone, From these it was observed that the transition zone becomes detectable with a thickness ratio (between it and the overlying layers) not less than 0.73 for the HAand 1.11 for the KHAtype curves. Also, it was discovered that the resistivity ratios (between it and immediate overlying layer) permitting detectability range between 1.67 to 3.67 for the HA-type, and 1.67 to 4.33 for the KHA-type curves. Below these ranges the zone becomes undetectable. These findings are not only supportive, but confirmatory of the results from the said earlier works of Ademilua (2007) and Ademilua and Olorunfemi (2010). It can thus be concluded that the basement transition zones are only detectable within certain limits of thickness and resistivity ratios. (" @default.
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- W2188697344 date "2011-01-01" @default.
- W2188697344 modified "2023-09-26" @default.
- W2188697344 title "Further Reflections on Computer Modeling for Detectability Assessment of the Transition Zone in the Basement Complex Terrain of Southwest Nigeria." @default.
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