by A. O. Ebuka, A. O. Akankpo and U. E. Essien
Original Research
This study provides accurate behaviour of petrophysical properties with depth for this formation by using Interactive Petrophysics software. The results of the analysis revealed the presence of different sand and shale units. From the analysis of the geological logs comprising gamma-ray and electrical resistivity, the Sonic, Density, Gamma, Neutron, Resistivity and Net Pay Zone value for the reservoirs of the two wells are 110.604 µs/ft., 341.659 µs/ft.; 2.180 g/cc, 2.195 g/cc; 52.782 API, 97.50API; 0.343, 0.52; 8.148 ohmm, 41.651 ohmm and 3295.5 ft, 2301.0 ft, the total porosity in the hydrocarbon bearing zone was found to range from 0.006 to 0.514, the water saturation range from 0.166 to 0.836 and the hydrocarbon saturation 0.164 to 0.834. Good well-to-well lithology correlation was established across the fields studied. The researcher found that the bulk of the hydrocarbon encountered in the Niger Delta basin was found to be within a depth range of 5,473 – 13,381 ft (1,668.17 – 4,078.53 m). The hydrocarbon reservoirs in this study were found to be in the Agbada formation, which is in conformity with the geology of the Niger Delta, Nigeria.
Journal of Geosciences and Geomatics. 2017, 5(2), 87-95. DOI: 10.12691/jgg-5-2-5
Pub. Date: April 17, 2017
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by Rasheed B. ADESINA and Peter OGUNSEIJU
Original Research
This study aimed at determining the depth profile and effects of domestic and economic activities on the accumulation of nutrients and trace metals in Awoye Estuary. Bathymetry profile along an approximately twenty-kilometre profile reveals a shallow water estuary, while its physico-chemical properties are greatly influenced by the influx of seawater, with chloride and sodium being the dominant ions. Low concentrations of calcium and potassium ion were observed across the estuary due to their preferential absorption with magnessium and sodium ion respectively. Nutrients concentrations such as phosphate and sulphate were present in relatively high amounts which can be hazardous to marine lives in the estuary, thus requiring urgent control. Results of trace metals in sediments show that concentrations of Pb, Zn, Cu, Cr and Ni are reflective of their inputs; with concentrations of Pb, Cu and Zn being higher at areas where there is high human population, oil exploration and economic activities. Generally, the estuary has fairly good water quality for the survival of marine lives. Sediments quality, however, needs to be closely monitored for ecological and public health risks associated with anthropogenic activities in the area.
Journal of Geosciences and Geomatics. 2017, 5(2), 78-86. DOI: 10.12691/jgg-5-2-4
Pub. Date: April 11, 2017
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by Luc Achille ZIEM A BIDIAS, Amidou MOUNDI and Jonas Didero TAKODJOU WAMBO
Original Research
Diverse eruptive dynamisms have occurred in the west side of the Bamoun plateau, producing ashes, scoria, lapilli, blocks and bombs. The lavas are essentially transitional basalts, and rhyolites. Transitional basalts are rather exceptional in the Cameroon Volcanic Line (CVL). The chemical composition of the minerals of these basalts is indicative of the thermobarometric conditions of their formation. In the locality of Nkoumelap situated to the West of the Bamoun plateau, they crystallized at low pressure (1.8 Kb) and relatively high temperatures (from 1110°C to 862°C in clinopyroxenes and 1044°C to 801°C in opaque minerals of transitional basalts) and differ significantly from the alkali basalts of the same plateau as well as from all the typical alkali basalts of the CVL. Measures of the distribution of volcanic products coupled to the volcanic history of the region could enhance understanding of the intensity of volcanic events and facilitate evaluation of induced risks. The Landstat 7 ETM+ data of the region was used to elaborate a hazards map of the zone, highlighting volcanic risks. This study, realized in the Bamoun plateau, is the baseline for a vast cartography program of the hazards and risks along the CVL. It could help to better protect the population and efficiently manage risks in case the volcanic activity is revived.
Journal of Geosciences and Geomatics. 2017, 5(2), 65-77. DOI: 10.12691/jgg-5-2-3
Pub. Date: April 08, 2017
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by Marju Ben Sayed and Shigeko Haruyama
Original Research
The flooding is a common feature for problem solution in rapidly urbanizing Dhaka city. In this research, evaluation of flood risk of Dhaka city in Bangladesh has been developed by using an integrated approach of GIS, remote sensing with socio-economic data. The purpose of the study is to evaluate the flooding risk concerning with the flood protection embankment in remarkable flooding events (1988, 1998 and 2004) and urbanization of Dhaka metropolitan zone. In this research, we considered the Dhaka city into two parts east Dhaka where is outside the flood protection embankment and west Dhaka where is inside the flood protection embankment. Using statistical data we explored the socio-economic status of the study area population by comparing density of population, land price and income level. We have drawn the cross section profile of the flood protection embankment into three different points for realizing the flooding risk in the study area, especially in the historical flooding year (1988, 1998 and 2004). According to the physical condition of the study area, the land use/land cover map has been classified into five classes. Comparing with each land cover unit, historical weather station data and the socio-economic data the flooding risk has been evaluated. Although various adaptation strategies for prevention infrastructure was developed on basis of 1988 memorial flood. As a result, urban area expansion has driven by infrastructure development by 10% and population growth by 5% inside the embankment area. The socio-economic development such as; the average total income inside of embankment has been increased 10 USD while the income outside the embankment remain same.
Journal of Geosciences and Geomatics. 2017, 5(2), 46-58. DOI: 10.12691/jgg-5-2-1
Pub. Date: March 09, 2017
30215 Views4542 Downloads