Fidelis Abija

University of Calabar | unical · Department of Physical Oceanography

The foundation of any civil engineering structure serves to transfer the superstructure load to the ground without causing any uneven response, excessive settlement and movement. The choice and design of any foundation requires consideration for the load, subsoil type, mineralogy and variation; suitable bearing capacity, groundwater conditions, geo...

This study aims at assessing the hydrogeological and geotechnical characteristics of gully erosion sites in Uturu and environs. Standard hydrogeological and geotechnical investigation methods were adopted in this study. Field geological study of the area revealed that it is covered by sedimentary rocks. The soils are lateritic and are the product o...

Production induced reservoir pressure dissipation causes stress changes leading to reduction in magnitude and rotation of the horizontal stresses on fault planes. Abrupt, stick-slip and spontaneous shear displacement of the downthrown block on crustal faults which can be due to stress perturbations is the causative mechanism of induced earthquakes...

All structures are founded either on or in soil or rock and design of all engineering structures is based on material properties. The alarming increase in the incidences of building collapse in Nigeria can be linked to the failure of foundation soils, apart from poor quality of construction materials in some cases. Under a structure, a foundation f...

Faults compartmentalize reservoirs and their stability can be breached under the current stress field. Fault failure may result in stick-slip displacement releasing felt seismicity, reservoir seal breach leading to secondary fluids migration and contamination; wellbore and casing shear, associated fracturing and activation of new faults. In this pa...

Pile foundation was proposed to support a 444.8kN loading jetty in the shoreline of the river channel. To determine the pile bearing capacities, engineering geological investigation involving the boring of 6 geotechnical boreholes to a depth of 30m, sampling, in situ standard penetration test and laboratory analysis were carried out. Foundation sub...

Faults compartmentalize reservoirs and their stability can be breached under the current stress field. Fault failure may result in stick-slip displacement releasing felt seismicity, reservoir seal breach leading to secondary fluids migration and contamination; wellbore and casing shear, associated fracturing and activation of new faults. In this pa...

Rock behavior in vertical and lateral successions, the effects of stress on the rock sequences which often cause compartmentalization and defining fluid communication within the basin is necessary for optimizing drilling , completion and production. Rock cores are seldom available for laboratory test hence dynamic method is used to derive the prope...

Correspondence: fidelabija@yahoo.co.uk. Abstract Research was aimed at assessing the suitability of Forcados River which is the major source of water for dry season irrigation farming in the study area. Method involved field sampling and laboratory analysis using the ASTM methods. Investigation of the suitability of the water for agricultural purpo...

Microbes act as geochemical agents for the degradation of environmental contaminants hence their abundance and distribution influences ecological response to pollution stress in soils, sediments, and rivers systems and in environmental protection. In this paper seasonal variation in geomicrologicl abundance in the river water, sediments and adjoini...

Reservoir pressure depletion with production leading to porosity loss, compaction and surface subsidence are the effect of effective stress changes and the imposition of the overburden stress which was partly supported by the fluids on the rock grain skeleton. Ground subsidence is associated with environmental hazards, failure of operational facili...

Pile foundation was proposed to support a 444.8kN loading jetty in the shoreline of the river channel. To determine the pile bearing capacities, engineering geological investigation involving the boring of 6 geotechnical boreholes to a depth of 30m, sampling, in situ standard penetration test and laboratory analysis were carried out. Foundation sub...

Reservoir pressure depletion with production leading to porosity loss, compaction and surface subsidence are the effect of effective stress changes and the imposition of the overburden stress which was partly supported by the fluids on the rock grain skeleton. Ground subsidence is associated with environmental hazards, failure of operational facili...

Coastal aquifer salinization which could be due to salt enriched intra-formation trapped seaward marine deposits, fossil sea water, leaching from saline confining beds, saline sea water intrusion, increase in the total dissolved solids, and tidally induced enlargement of salt water zone is a stack reality in the basin. In this study, integrated ver...

Oil and gas production leads to formation pressure depletion, porosity loss and compaction causing sinking of the ground surface above the producing zone that extends to hundreds of kilometers in lateral extent. Ground subsidence is noticeable as protrusion of wellheads and casings in oilfields, encroachment and submergence of previously dry lands...

Coasts and coastal systems are highly dynamic under hydrodynamic forcings. Relative rise in sea level in addition to the eustatic rise can be due to vertical ground movements, increase in volume or mass of water, changes in shape of the oceanic basin and the terrestrial hydrologic regimes acting to cause flooding and erosion in the coastal zone. In...

Reservoir pressure depletion with production leading to porosity loss, compaction and surface subsidence are the effect of effective stress changes and the imposition of the overburden stress which was partly supported by the fluids on the rock grain skeleton. Ground subsidence is associated with environmental hazards, failure of operational facili...

Wellbore failure reportedly accounts for more than 10% of drilling non productive time in the Niger Delta. Rock mechanical properties critical to wellbore stability, well design, fracking, sanding prediction and production planning were evaluated in 3 wells in an onshore field, western Niger Delta using 4-arm caliper, gamma ray, density and sonic l...

The central areas of Cross River State are underlain by cretaceous sediments and basement complex rocks with a history of low yield groundwater abstraction wells thus necessitating detailed pre-drilling aquifer characterization and groundwater assessment for siting of drilling locations and appropriate well design. In this study, 20 vertical electr...

Pre-design and construction geotechnical assessment of subgrade and sub-base materials was carried out for optimal performance and pavement sustainability. Method involved boring of 59holes and trial pits, sampling and geotechnical testing. Soil profile indicates a top inorganic clay layer (CL) from surface to an average depth of 0.55m, a silty san...

In this paper site, investigation was carried out to reveal the site subsurface condition, determine bearing strength, predict settlement and recommend foundation for a 20,000us gallons elevated Braithwaite water tank. Method involved the boring of 3geotechnical boreholes to a depth of 10m, sampling and laboratory analysis.Results indicatethat very...

Road pavements in the coastal Niger Delta are under perennial flooding and ingress of undrained water into the pavement layers through cracks, joints, voids, and embankments. Studies have shown that water in road bed leads to increased unit weight under saturated conditions, reduced shear strength, excess pore water pressures, increased seepage pre...

Subsurface rocks' response to stress and the attendant deformation is a function of the geomechanical properties under in situ pore pressure conditions. Understanding rock behavior in vertical and lateral successions, the effects of stress on the rock sequences which often cause compartmentalization and defining fluid communication within the basin...

Predicting subsurface rocks' storage properties is a fundamental problem of groundwater prospecting and potential evaluation for planning of long term abstraction wells. Water in aquifers is stored and or released from elastic storage and gravity drainage. Aquifer storage parameters are traditionally determined from pumping tests data which are sel...

This study was carried out to map and characterize the water bearing formations (aquifers) in Abia State, southeastern Nigeria. Vertical electrical resistivity depth sounding for inferring the resistivity and thicknesses of the vertical succession of different conducting zones in the subsurface was employed in characterization of the subsurface aqu...

Heavy metals (Fe, Zn, Cu, Cd, Cr, V, Ni, Pb, and Mn) contamination in Forcados river bed sediments and adjoining soils were evaluated over two seasons in 2009 and 2010. Nine sediment sampling stations were established as upstream, midstream and downstream along the course of the river around the communities of Tuomo, Tamigbe and Ojobo and samples c...

This study was carried out to map and characterize the water bearing formations (aquifers) in Abia State, southeastern Nigeria. Aquifer hydraulic properties were obtained from existing borehole logs and pumping tests data obtained from the field. More recent productive boreholes in the study area were accurately geo-referenced by taking GPS elevati...

A pre-construction site investigation was carried out in a marshy stream channel and adjoining areas for a proposed building site to characterize the subsurface subgrades and recommend foundation design for which proposed structures include a 1-floor 39.7m x 33.7m hostel, a 20.5m x 10.0m 4-bedroom duplex and a 1-floor 2-bedroom block of flats measu...

A pre-construction site investigation was carried out in a marshy stream channel and adjoining areas for a proposed building site to characterize the subsurface subgrades and recommend foundation design for which proposed structures include a 1-floor 39.7m x 33.7m hostel, a 20.5m x 10.0m 4-bedroom duplex and a 1-floor 2-bedroom block of flats measu...

Agenda 2030 of the UN General assembly (2015) has set out 17 target goals to address present most critical global challenges building on the 8 millennium development goals (2000) which actions were for low income countries except MDG 8 (global partnership) that held rich countries responsible for their actions. Sub-Saharan Africa and Nigeria in par...

This study was carried out to map and characterize the water bearing formations (aquifers) in Abia State, southeastern Nigeria. Aquifer hydraulic properties were obtained from existing borehole logs and pumping tests data obtained from the field. More recent productive boreholes in the study area were accurately geo-referenced by taking GPS elevati...

In situ stress magnitude and orientation are necessary for oil and gas field development planning to achieve optimal well placement whether vertical, deviated or horizontal, wellbore stability analysis for safe and stable drilling to reduce non-productive time, fault stability and cap rock integrity modeling for CO 2 geosequestration and stage plac...