Estimate of Groundwater in Parts of Niger Delta Area of Nigeria Using Geoelectric Method

The River Niger, which flows beside Asaba, is grossly inadequate for domestic use due to activities in its early stages. At Ibusa, the existing streams are not good for domestic use due to contaminations. Unfortunately, these have been the main sources of water to residence of Asaba and Ibusa. The situation is worse in Ogwashi-Uku where there is no nearby stream. This inadequacy of potable water is of great concern to the residence of these communities. The groundwater potential of Asaba and neighboring towns in parts of Delta State of Nigeria was therefore, evaluated using geoelectric method to alleviate this problem (Mbipom and Archibong 1989). The data obtained showed that while the formation at Asaba is AK type, the neighboring towns have typically A- type curves. The resistivity of the top soil ranges from 73m -130m, while the second and third layers are 120m-230m and 320m-560m respectively. Viable aquifer is within 35m to 40m at Asaba but above 100m at Ibusa and Ogwashi-Uku which are just a few kilometers away. @JASE

Determination of Formation Strata and Groundwater Potential in Sapele Metropolis and Environ

This study was carried out in Sapele, Jesse and Oghara, Delta state to determine the groundwater potential by correlating results of seismic refraction survey and those of electrical resistivity studies. Fifteen vertical electrical sounding (VES) locations were sounded and nine seismic stations were shot to complement the study. The seismic results show that the area has generally three or four layer formations. The thin weathering layer with thickness of 1.0 - 3.5 m has velocity range of 250 \u2013 350 m/s. while the velocities of second and third layers range from 900 -1400m/s to consolidated zone. The analysis of the VES data delineated 4 to 5 layers with HK and AKA curves types mainly and showed that the formation of the area is basically conducting which suggests the existence of heavy clay or clayey sand formations. Although the numbers of layers delineated differ, both methods indicate that viable aquifer at Sapele and Jesse is generally within 25m although false and contaminated aquifer may be intercepted at 10 -15 m. On the contrary, Oghara is more of sandy formation with aquifer above 35 m

Determination of Formation Strata and Groundwater Potential in Sapele Metropolis and Environ

This study was carried out in Sapele, Jesse and Oghara, Delta state to determine the groundwater potential by correlating results of seismic refraction survey and those of electrical resistivity studies. Fifteen vertical electrical sounding (VES) locations were sounded and nine seismic stations were shot to complement the study. The seismic results show that the area has generally three or four layer formations. The thin weathering layer with thickness of 1.0 - 3.5 m has velocity range of 250 – 350 m/s. while the velocities of second and third layers range from 900 -1400m/s to consolidated zone. The analysis of the VES data delineated 4 to 5 layers with HK and AKA curves types mainly and showed that the formation of the area is basically conducting which suggests the existence of heavy clay or clayey sand formations. Although the numbers of layers delineated differ, both methods indicate that viable aquifer at Sapele and Jesse is generally within 25m although false and contaminated aquifer may be intercepted at 10 -15 m. On the contrary, Oghara is more of sandy formation with aquifer above 35 m

Prospecting for metallic mineral deposits using integrated electromagnetic and electrical resistivity tomography in Agbede, Edo State Nigeria

This study involves the application of Very Low Frequency-Electromagnetic (VLF-EM) and Electrical Resistivity Tomography (ERT) in locating and mapping of metallic mineral deposit potential in Agbede and its environs, Edo State Nigeria. The field geometry was made up of four traverses measuring 200 m, 210 m, 320 m and 310 m carried out in four localities (Kilometres 50, 54, 86 and 92 respectively along Okene-Benin Road) at a mean separation of 10 m with frequency band of 18.8 KHz and signal strength of 13 db. Two traverses in Kilometres 86 and 92 were utilized by ERT investigation due to VLF- EM results. The results of the qualitative interpretation of VLF-EM identified areas suspected to be of Metallic Ore importance. These form the basis for Electrical Resistivity Tomography (ERT) investigation. Results of the resistivity model and surfer plot geologic sections show that metallic mineral signatures of ERT imaging in Kilometre 86 are not well defined probably due to low data density records. However, the ERT images obtained from Kilometre 92 and line crosses of the electromagnetic anomalies, c1, c2, c3 and C4 revealed c4 as metallic mineral. The ERT interpretations indicate that the c4 anomalies in the VLF-EM curve are responses from closely separated conductors. These inferred metallic mineral deposits occur at 4.8 m and 7.5 m below the surface extending to depths of 8.5 m and 9.3 m respectively. The geologic section shows that they are laterally located at 123m, 128 m, 133 m and 137 m respectively along the transverse.Keywords: VLF – EM, Resistivity tomography, Metallic mineral deposits, Geologic interface, Agbede Edo State Nigeri

Estimate of groundwater in parts of Niger Delta Area of Nigeria using geoelectric method

The River Niger, which flows beside Asaba, is grossly inadequate for domestic use due to activities in its early stages. At Ibusa, the existing streams are not good for domestic use due to contaminations. Unfortunately, these have been the main sources of water to residence of Asaba and Ibusa. The situation is worse in Ogwashi-Uku where there is no nearby stream. This inadequacy of potable water is of great concern to the residence of these communities. The groundwater potential of Asaba and neighboring towns in parts of Delta State of Nigeria was therefore, evaluated using geoelectric method to alleviate this problem (Mbipom and Archibong 1989). The data obtained showed that while the formation at Asaba is AK type, the neighboring towns have typically A- type curves. The resistivity of the top soil ranges from 73m -130m, while the second and third layers are 120m-230m and 320m-560m respectively. Viable aquifer is within 35m to 40m at Asaba but above 100m at Ibusa and Ogwashi-Uku which are just a few kilometers away. @JASE