Integration of structural and horizon mapping of 3D seismic volume, petrophysical studies of over sixty (60) wireline logs, stratigraphic analyses, reservoir property modeling and production information have been adopted to study Eni field that has been experiencing production decline with increase in water output. Generated reservoir structural framework and spatial reservoir property distribution have proved useful to guide the optimal placement of proposed wells and also provide information needful for the development of best production plan that would guarantee effective oil drainage from the delineated reservoir compartments.
Three Dimensional (3D) Electrical Resistivity Imaging (ERI) was carried out for pre-construction foundation investigation of a proposed engineering construction site within the University of Ibadan Campus, southwestern Nigeria, where some distressed structures (offices and hostels) have been reported to show stress induced cracks attributed to incompetent foundation support from rocks upon which they were constructed. The 3D grid of resistivity data generated along parallel and equally spaced profiles stations presented the resistivity distribution of the subsurface as well as delineated zones of relatively high resistivity values (450-4500 Ω m) in the east and lower resistivity zones (15-300 Ω m) in the west. The study also delineates zones of isolated low resistivity values (10-50 Ω m) at the mid and west end of the field. The generated resistivity distribution sections, maps and 3D model indicate spatial variation in resistivity value which varies both laterally and vertically. The variation which is attributed to differences imposed by underlying rock's structural and geological rock composition resulted from complex rock coexistence as schist (quartz-and amphibolitic-schist) and quartzite coexist as underlying rocks of the proposed construction site, especially since these rocks respond to weathering differently. The generated subsurface resistivity model guided selection of geotechnical investigation points which captures spatial variation in subsurface physical properties as recorded by the measured subsurface resistivity. Better guided geotechnical investigation provided needed information required to design appropriate foundation support for the proposed engineering structure.
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