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Aeromagnetic Interpretation of Basement Structures and Geometry in Parts of the Middle Benue Trough,North Central,Nigeria

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Advances in Geological and Geotechnical Engineering Research 2022年第4期4卷 22-40页

作者： Esho Oluwaseyi Olatubosun Osisanya Olajuwon Wasiu ibitoye taiwo abel Ajibade Femi Zephaniah Tokunbo Sanmi Fagbemigun Department of Geology University of IbadanIbadanNigeria Department of Physics University of BeninBeninNigeria Department of Petroleum Engineering and Geosciences Petroleum Training InstituteEffurunNigeria Department of Geophysics Federal UniversityOye-EkitiNigeria

The research of an analysis of aeromagnetic data collected in the middle Benue Trough in north-central Nigeria is presented.A detailed analysis of basement structures is conducted in order to identify regions with high hydrocarbon potential that is different from those discovered by earlier *** data were filtered by using the Butterworth and Gaussian filters,transformed by engaging the reduction to the equator technique,and subsequently *** estimate magnetic basement depths at various places throughout the basin,the Euler deconvolution depth weighting approach was ***(11)sub-basins with depths ranging from-2000 m to-8000 m were also identified by Euler’s *** sub-basins trend in the NE-SW direction while the average sediment thickness is found to be more than 3 *** extracted structural features indicate areas like Kadi Blam and Kado areas in the southeastern part and Ogoja and Obudu in the southern part of the study area as regions with high structural *** areas coincide with the areas delineated as the *** cross-sections generated reveal depressions caused by the action of some tectonic activities in the *** study identified undulating basement topography believed to be due to tectonic activities as well as five areas that are possible targets for hydrocarbon exploration.

关键词： Aeromagnetic data Euler deconvolution Basement structures Hydrocarbon potentials Middle Benue Trough

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Application of Geophysical Methods to Building Foundation Studies

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International Journal of Geosciences 2013年第9期4卷 1256-1266页

作者： Folahan Peter ibitoye Felix Vincent Ipinmoroti Mudasiru Salami Kunle Joseph Akinluwade Adeyinka Taofeek taiwo Adelana Rasaki Adetunji 1Department of Applied Geophysics Federal University of Technology Akure Nigeria 2Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) Ilesa Nigeria 1Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) Ilesa Nigeria 2Department of Materials Science and Engineering African University of Science and Technology (AUST) Abuja Nigeria 1Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) Ilesa Nigeria 2Department of Materials Science and Engineering Obafemi Awolowo University Ile-Ife Nigeria Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) Ilesa Nigeria

A geophysical survey involving the electrical resistivity method utilizing the Vertical Electrical Sounding (VES) and Electrical Imaging Techniques was conducted around the premises of an area within south-western Nigeria with the aim of studying structural defects which may be responsible for future problems and characterizing the soil conditions of the site. A total of 15 VES stations were occupied using Schlumberger Configuration with AB/2 varying from 1 to 65 m. In the electrical imaging, dipole-dipole array was adopted and the two traverses were occupied in the S-N and E-W directions close to where wall cracks and subsurface problems were manifested. Five main geoelectric sequences were delineated within the study area;these include the topsoil (clay and sandy clay), lateritic clay, weathered bedrock (clay, sandy clay and clayey sand), fractured bedrock and fresh basement. A major discontinuity (fracture zone) was discovered along the S-N direction, while a weak zone was also discovered along E-W direction. The result of this research has shown that the causes of the cracks and distress on the walls within the site may have been influenced by the differential settlement resulting from the incompetent subsoil materials and the fractured bedrock on which the foundation of the building was laid.

关键词： Foundation Bedrock Basement Cracks Subsurface Instability

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