British Journal of Earth Sciences Research (BJESR)

EA Journals

Geophysical Mapping

SUBSURFACE GEOPHYSICAL MAPPING AND DRILLING OF ABA-ISU LIMESTONE DEPOSIT (SHEET 156E), SOUTH-EASTERN, NIGERIA. (Published)

Geoelectric mapping and drilling of Aba-Isu limestone deposit was carried out using a hybrid method, a combination of Wenner and Schlumberger resistivity techniques. The iso-resistivity maps indicated a roughly NW–SE trending of the limestone deposit. The resistivity values in the range of 40-260Ώm is inferred to be limestone with varying gradations, and relatively low resistivity values <40Ώm. Areas around the central line axis have resistivity values >100Ώm particularly for the “a” of 5m and 10m respectively and consistent and coincidental with the areas where the limestone massively outcropped. The study area indicated a 4-5 layer stratified alternating sequence of high and low resistivity horizons, the sequence start with high resistivity horizon with values >100 Ώm alternating with low-medium resistivity horizons with values in the range of 20-50Ώm. This sequence in 2 or 3 cycles and terminated by the highly conductive horizon with resistivity values of <20Ώms. The pseudo-sections, resistivity values greater 100Ώm are inferred as limestone, there is a consistency of these values on a trend coinciding with the central line axis. The same values are observed at various depths beneath the subsurface implying the occurrences of limestone which extend beyond 35m depth.

Keywords: Aba-Isu, Drilling, Geophysical Mapping, Limestone, Nigeria

Scroll to Top

Don't miss any Call For Paper update from EA Journals

Fill up the form below and get notified everytime we call for new submissions for our journals.