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DC Field | Value | Language |
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dc.contributor.author | Olayinka, A.I. | - |
dc.date.accessioned | 2021-08-06T12:25:43Z | - |
dc.date.available | 2021-08-06T12:25:43Z | - |
dc.date.issued | 1997 | - |
dc.identifier.other | ui_art_olayinka_error_1997 | - |
dc.identifier.other | Journal of African Earth Sciences 24(4). Pp. 635-647. | - |
dc.identifier.uri | http://ir.library.ui.edu.ng/handle/123456789/5432 | - |
dc.description.abstract | The magnitude of errors in the determination of depth to bedrock from Wenner and Schlumberger resistivity sounding curves, caused by the nonidentification of a suppressed layer, has been investigated. The principal objective is to evaluate how the layer thicknesses and resistivities affect the accuracy of depth estimates. In the computations, the intermediate layer in a 3-layer model, in which the resistivity increases with depth, is removed and the 2-layer sounding curve that is electrically equivalent to the 3-layer curve is generated. The results indicate that there is a possibility for large depth underestimations when the resistivity contrast between layers 1 and 2 is very large. This is manifested in a steeply rising terminal branch on the sounding curve. There is a slight decrease in the depth underestimation as the resistivity contrast between layers 2 and 3 increases. Conversely, if the intermediate layer is fairly thick and the resistivity contrasts are not too large, the best-fit 2-layer curve shows large deviations from the 3-layer curve, in such cases, the intermediate layer can be identified, resulting in reliable depth estimates. A field example from Nigeria is presented in which the sounding data has been interpreted so as to account for a prebasement layer of intermediate resistivity, indicative of a fractured granite. | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | Elsevier Science | en_US |
dc.title | Error in depth determination from resistivity soundings due to non-identification of suppressed layers | en_US |
dc.type | Article | en_US |
Appears in Collections: | Scholarly works |
Files in This Item:
File | Description | Size | Format | |
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ui_art_olayinka_error_1997.pdf | 3.02 MB | Adobe PDF | ![]() View/Open |
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