Research Papers/Topics in Applied Geophysics

Interval Velocity Estimations from Seismic Reflection Data

ABSTRACTThe research project was carried out to study the estimations of interval velocity from seismic reflection data of the acoustic P waves inside the Earth using the method of time migration which is necessary for obtaining seismic images in regular Cartesian coordinates. The main goals of the research work were to develop algorithms to convert time-migration velocities to true seismic velocities, and to convert time-migrated images to depth images in regular Cartesian coordinates....

Integrated geophysical investigation of foundation condition beneath a site earmarked for a civil engineering construction project

Geophysical investigation involving the electrical resistivity method was carried out at a site earmarked for construction of a Lecture Theatre at the Obafemi Awolowo University Teaching Hospital Complex (OAUTHC) in Ile-Ife, Osun State Nigeria. The aim was to generate 2-D subsurface images beneath the site which will provide the required geological information for location and design of the building foundation. The geophysical investigation involved the 2-D imaging technique which utiliz...

DEPTH TO MAGNETIC SOURCE ANALYSIS USING SOURCE PARAMETER IMAGING (SPI), ANALYTICAL DEPTH AND SPECTRAL DEPTH ESTIMATES

Four sheets of aeromagnetic data, which are the aeromagnetic map of Nsukka, Udi, Nkalagu, and Igunmale were obtained from the Nigerian Geological Survey Agency, these areas are within the Lower Benue trough and Anambra Basin, Southeast of Nigeria. Oasis Montaj 6.4.2, ArcGIS 10.2.2, Surfer 11, and Excel 2016 software, were used in the processing and interpretation of the aeromagnetic data obtained qualitatively and quantitatively. The results of the qualitative interpretation on application of...

GEOPHYSICAL INVESTIGATION OF SHARE, TSARAGI AND YIKPATA IN KWARA STATE, NIGERIA.

This  report  describes  the  acquisition,  processing,  and  results  of  the  University  of  Ilorin Department  of  Geophysics  2019  Summer  Field  Camp.  From  4th  of  April  through  7th  of  April,  a team  of  undergraduate  students  from  the  University  of  Ilorin,  along  with  lecturers  and department  technicians  conducted  a  series  of  geophysical  surveys  at  Share,  Tsaragi  and  Yikpata area  in  Kwara  state.  In...

Application of Very Low Frequency (VLF) Electromagnetic method to mineral exploration (Mining Geophysics) with case study review.

The Very Low Frequency Electromagnetic (VLF-EM) method, which enables surveying without contact with the ground, is suitable for ground surveys in a wide area and has been used in mapping geology and in mineral exploration for decades. The technique makes use of signal radiation from military navigation radio transmitters operating in the frequency range of 15-30 kHz. When the electromagnetic wave impinges on the surface it is both reflected back into the air and refracted into the earth. By ...

MAPPING OF MAGNETIC ANOMALIES IN SOME PARTS OF NIGERIA CHAD BASIN, USING AEROMAGNETIC DATA

 ABSTRACTAeromagnetic data over some part of the Chad Basin, Nigeria was analyzed. The aeromagnetic anomaly map, its qualitative and quantitative interpretation helped in identifying the nature and depth of the magnetic sources in the study region. The regional-residual separation was performed with a first order polynomial using oasis montaj software. The residual data obtained was contoured into 3-D maps and this revealed two prominent magnetic anomaly source intensities; the low fre...

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Geophysical investigation of groundwater potential 

Investigation into the weathering layer using up-hole method of seismic refraction.

This paper is aimed at using up-hole method of seismic refraction survey to investigate the thickness ofthe weathering layer as well as the velocity of seismic waves through the layer. The first events to arriveat the geophones on a refraction profile had travelled by refraction along the top of the high speed zonejust below the weathering layer. Using the time- offset curves of the first arrivals for shots from differentcharge depths; the thickness of the weathering layer was calculated by c...

Integration of Aeromagnetic Data and Landsat Imagery for Structural Analysis: A Case Study of Awgu in Enugu State, South-Eastern, Nigeria.

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...

Integration of Aeromagnetic and Landsat Data in the Analysis of Dump Site (Landfill) in Owerri, Imo State.

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 e...

Determination of subsurface rock properties from AVO analysis in Konga oil field of the Niger Delta, Southeastern Nigeria.

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, combin...

Evaluation of Waste Landfill Using 2-D Resistivity Imaging. ( A Case Study Of Iguomo Dumpsite) Edo State, Nigeria

AbstractMunicipal 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 wa...

QUALITATIVE PETROPHYSICAL ANALYSIS OF WELL LOG DATA FROM WABI FIELD_By Popoola, Oladotun, 2015

                                                                          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 thei...


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