Applied Geophysics Research Papers/Topics

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

  ABSTRACT Aeromagnetic 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 freque...

GEOELECTRICAL INVESTIGATION OF GROUNDWATER POTENTIAL OF ADMINISTRATIVE BLOCK AT PERMANENT SITE, FEDERAL UNIVERSITY DUTSIN-MA, KATSINA STATE, NIGERIA

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...

Geophysical Investigation of the Causes of Borehole Failure in the Crystaline Basement Complex: A Case Study of Kaura Area of Kaduna State, Nigeria

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...

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 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 ...

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 effectiveness in characte...

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, combined with a wavelet extracted from...

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

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...

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 their b...

Development of a Geo-electrical Database Management System (GDBMS) for Geoscientist Application.

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 as Foundation Materials in Umudike Area, Southeast Nigeria

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...

Resolution of Uncertainties in Convectional Logs Using 3D Explorer (3DEX) Data Sets: Niger-delta Example, OLU Field

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...

Geoelectrical Survey of Ground Water in Some Parts of Kebbi State Nigeria, a Case Study of Federal Polytechnic Bye-Pass Birnin Kebbi and Magoro Primary Health Center Fakai Local Government

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 ...

Establishment of Electromagnetic Distance Measurement (EDM) Calibration Base

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...


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