Groundwater exploration
Abstract A geophysical survey for groundwater resources was carried out in the administrative block of Federal University Dutsin-Ma, permanent site. This was successfully done by employing the electrical resistivity method to investigate the water table variations, the depth to basement, thickness of weathered basement, thickness of aquifer and area suitable for boreholes establishment within the areas covered wit...
Abstract Vertical Electrical Soundings (VES) using Schlumberger array were carried out at different points along five (5) profiles. This research investigates the causes of massive borehole failure at Kaura area of Kaduna state using the resistivity tomography techniques. Terrameter SAS300 is the instruments used to acquire the data. A total of 19 boreholes are functioning, while 31 boreholes are non-functioning within the area. The investigation has portrayed...
This paper is aimed at using up-hole method of seismic refraction survey to investigate the thickness of the weathering layer as well as the velocity of seismic waves through the layer. The first events to arrive at the geophones on a refraction profile had travelled by refraction along the top of the high speed zone just below the weathering layer. Using the time- offset curves of the first arrivals for shots from different charge depths; the thickness of the weathering layer was calculated ...
In this study, digital format data comprising of aeromagnetic and remotely sensed (Landsat ETM+7) data were used for structural interpretation of the Awgu area in Enugu State, southeastern part of Nigeria, predominantly underlain by sedimentary rocks. Aeromagnetic data were analyzed using the Oasis Montaj 7.5 software and interpretation was carried out using the vertical and horizontal gradients, analytical signal, reduction to pole, tilt depth as well as Euler deconvolution. The total magnet...
Magnetic study over South Eastern Nigeria was performed as part of a multi-technique geophysical investigation. Various magnetic data enhancement procedures such as, qualitative (second vertical derivative, total horizontal derivative, analytic signal, theta map, tilt derivative, total horizontal derivative of tilt derivative and horizontal tilt angle) and quantitative (Werner and Euler deconvolutions) interpretation techniques were employed to determine their effectiveness in characte...
Amplitude variation with offset (AVO) analysis was carried out on Konga oil field, an onshore oil field in the Niger Delta, Southeastern Nigeria. The study consisted of forward modeling from rock parameters measured from well logs and AVO analysis of events on pre-stack time migrated 3D seismic gathers. Forward modeling predicted specific AVO behaviour of anomalous reservoir sands in the field. Density, compressional and shear wave velocity logs, combined with a wavelet extracted from...
Abstract Municipal solid waste disposal sites can be sources of groundwater contamination and the contamination problems are more likely to occur in humid areas, where the moisture available exceeds the ability of the waste pile absorb water. 2-D resistivity imaging has frequently been used in the subsurface pollution studies. The method maps the distribution of resistivity of subsurface materials. The 2-D resistivity image provides general information on subsurface stratification of buried w...
ABSTRACT Qualitative Petrophysical Analysis of Wabi 10 well, located in the Wabi Oil Field in the Niger Delta was carried out. The wire-line log comprising of gamma rays, resistivity and neutron – density logs provided by Total Exploration and Production Nigeria Limited (TEPNL) was used. The properties considered include Lithofacies, the Permeable and Impermeable beds with their b...
In the field of geosciences, large sum of data are always acquired, processed and interpreted for different geographic locations, but only few of the data are well managed, such that, they can be useful for subsequent geoscience related surveys carried out in the same geographical locations. This is a challenge in the geoscience field, and it would be beneficial to the field when this challenge is resolved and it becomes a utilisable concept. It is in this regard that a database mana...
Geoelectrical investigation of soils in Umudike area of Abia State was undertaken in order to determine the competence of the soils as foundation materials. A total of 18 Vertical Electrical Sounding (VES), using Schlumberger configuration was carried out. The results revealed three to six distinct geoelectric sequences with resistivities ranging from about 8 Ωm to about 38,000 Ωm and a variation in topsoil thicknesses with the l...
The novel approach of unraveling the potential of bypassed hydrocarbon reservoir a thinly laminated geology by comparing the petrophysical parameters and computed Stock Oil Initial-in-Place (STOIIP) obtained from conventional log response to that obtainable in high resolution image data sets was carefully initiated. Archie's equation was adopted in the estimation of water saturation. The net-to-gross was estimated directly from the logs. TECHLOG 2.7 Version was used to estimate the pefrophys...
Abstract Schlumberger array is the most commonly used among other arrays for Vertical Electrical Sounding (VES) and it requires large spacing at both ends for deeper subsurface information. The problem of limited space for spreading in built up areas could lead to incomplete information from deeper depth. The Geolectrical survey involving electrical resistivity methods has been carried out at Birnin Kebbi and Fakai Local Government Area in Northern Nigeria with the view to delineate ...
Electromagnetic Distance Measurement (EDM) equipment is calibrated on a base to determine instrument constants and errors. A series of measurements on a base can also be used to check the performance and reliability of the instrument over time and to assess its precision against the manufacturer's specifications. This research work, the establishment of Electromagnetic Distance Measurement (EDM) calibration base entails the setting up of a functional base where calibration of electr...
A structural evaluation of a post stack time migrated (PSTM) 3D seismic data over an X–Field in the eastern Niger Delta has been attempted. The objective of the study is to structurally evaluate the field with a view to identifying structural features such as faults, map geologic horizons and analyze reflection characteristics that might be a good lead to probable hydrocarbon accumulations. Results revealed that six growth faults (F1, F2, F3, F4, F5, and F6) and three seismic horizons (HI, ...