https://www.tandfonline.com/doi/pdf/10.1080/20909977.2019.1689629

Application of high-resolution gravity data for litho-structural and depth characterisation around Igabi area, Northwestern Nigeria

Possible cause of gravity anomalies in parts of the Niger Delta Basin, Nigeria was investigated using three methods of gravity data interpretation; Euler-3D deconvolution, source parameter imaging (SPI) and forward and inverse modeling. The estimated depths from the interpretation techniques used show much similarity. Quantitatively, the results obtained from the SPI method showed a minimum to maximum depth of 1264.11 to 9354.57 m to the anomalous body. The results obtained from Euler-3D deconvolution method showed a depth range of 2136.40 to 9167.57 m to the anomalous body using a structural index of 3. The results from the forward and inverse modeling revealed a depth range of 793 to 7586 m to the anomalous body. Qualitatively, the gravity signatures in profiles 1, 2 and 3 possibly depict antiformal geologic features whereas the gravity signatures in profiles 4 and 5 possibly depict synformal features/basin geometries.

	 

	Key words: Gravity data, Niger Delta, source parameter imaging, Euler deconvolution, forward and inverse modeling, anomalous body.

https://www.africaneditors.org/journal/IJPS/full-text-pdf/95036-112995

Investigation of possible cause of gravity anomalies in parts of the Niger Delta Basin, Nigeria

/pdf/assessment-of-polycyclic-aromatic-hydrocarbon-contamination-2an1wphs.pdf

Assessment of Polycyclic Aromatic Hydrocarbon Contamination of Fruits, Leaves, and Soil within Automobile Repair Workshops in Nsukka Metropolis

Gravity anomalies in parts of the Niger Delta region, Nigeria, were investigated through the interpretation of aerogarvity data with the objectives to determine the thickness of the sedimentary basin, establish the basement topography, density contrasts and the geological models which will give information about variation of geological structures. Four sheets of digital airborne gravity data were used for the study.  Source parameter imaging (SPI), Standard Euler deconvolution and forward and inverse modeling techniques were employed in quantitative interpretation. The Bouguer anomaly of the study area varied from -20.0 to 37.7 mGal, while the residual Bouguer anomaly varied from -19.6 to 25.7 mGal. The SPI gave depth values ranging from -539.7 to -4276.0 m for shallow and deep lying gravity anomalous bodies. The windowed Euler-3D for Bouguer gravity result revealed the depth range of 1355.5 to -1518.1 m for structural index of one; 2384.5 to -3283.2 m for structural index of two and 2426.0 to -5011 m for structural index of three. The forward and inverse modeling gave the density values for the modeled profiles 1, 2, 3, 4 and 5 as 1.820, 2.410, 0.720, 2.310 and 2.100 gcm-3, respectively, with their respective depths of 3872, 4228, 4880, 3560 and 2527 m. The results from this study have shown that the depth to basement and density contrast have influence on the petroleum/hydrocarbon accumulation.

	Key words: Aerogravity, basement, density contrast, sedimentary.

/pdf/investigation-of-gravity-anomalies-in-parts-of-niger-delta-ebxnzpciul.pdf

Investigation of gravity anomalies in parts of Niger Delta Region in Nigeria using aerogravity data

The radiation coming from the sun to the earth is the only form of incoming radiant energy that determines the heat balance and thermal regime of the earth. Variation of solar radiation is the single most important factor affecting the earth’s surface temperature. This study seeks to investigate the relationship between ambient temperature and soil temperature with a view to determine the existence of space-earth coupling. With a view to achieving this aim, the research was narrowed to the correlation between air temperature and soil temperature for the Nsukka area of Enugu State in Nigeria. The data used in this study was a two-year data of air temperature and soil temperature measurements collected by the Nigerian Environmental Climactic Observing Program (NECOP) station situated at Nsukka, which carried out simultaneous basic measurements of meteorological and climatological variables, in real time, through telemetry technology, with 5-min update cycles. In order to visualize the relationship between the two variables under study, the soil and air temperatures were co-plotted with time for each month of the year for 2011 and 2012, daily and annual range using Microsoft Excel, OriginPro 2018 64-Bit and Python Programming. From the findings of this work, the air and soil temperature variation patterns over each day, month, and year depict a pattern of correlation. The soil temperature fluctuated alongside the variations observed in air temperature with the addition of time lags (response time) due to difference in their thermal conductivities and heat capacities. This time lag was observed from this work to be up to 2 to 3 h for Nsukka region. On cooling, a delay was also observed in the air temperature, as the air temperature cools about an hour after the reduction in soil temperature was observed in a daily cycle.

https://academicjournals.org/journal/IJPS/article-full-text-pdf/ED0253B68461.pdf

U J Abangwu

Papers

Investigation of gravity anomalies in parts of Niger Delta Region in Nigeria using aerogravity data

Space-earth coupling with relation to earths thermal capacity: A case study for Nsukka Region, Nigeria