COMPARISON OF GEOPHYSICAL PARAMETERS OF GEOELECTRIC SECTION AND SEISMIC REFRACTION IMAGING ALONG THE SAME PROFILE ACROSS A BOREHOLE LOCATION AT AGBAN-KAGORO, KADUNA STATE NIGERIA

Cyril Gwazah Afuwai

Abstract


Geophysical survey was carried out across a functional borehole with the aim to compare the geophysical parameters of Geoelectric section and seismic refraction tomography taken along the same profile. In the Geoelectric section ten (10) VES Points were taken at 5m interval along the W-E direction across the borehole, five (5) subsurface layers were detected; the topsoil comprising wet sandy clay, the weathered basement which constitutes of water and sand with little traces of sandy clay at VESagb8, the partially weathered basement with resistivity range of 133-178Ωm composed of fine grain sand, the fractured basement comprises of coarse grain sand with resistivity range of 237-316Ωm, the fifth layer is the fresh basement rock. The Seismic refraction tomography is predominantly characterized by four (4) layers having relatively low p-wave velocities (327m/s) at its uppermost layers and relatively high velocities of over 2420m/s at depths. The range of the velocity measured (327 - 2500 m/s) encompasses the p-wave velocities of sand (320 - 800 m/s), sandy clay (850 - 1250m/s) and clay (900 – 25000 m/s) which occur at shallow depths (24m) while at depths, occur coarse grain sand (weathered basement) of p-wave velocities (1500-30000m/s) and porphyritic granite (fresh basement) of range 2000–45000 m/s. Aquiferous zones (1200 m/s – 1500 m/s) occur between the depths of 12m and 25m. Generally, the survey shows a high correlation of the earth materials along the profile for both the resistivity and seismic refraction surveys.

 

 

 

 

 

 

Keywords: Borehole, Geoelectric, Seismic


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