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Seismic net-to-gross estimation for a geologic model update: A case study from a turbidite lobe reservoir in the deepwater of the Niger Delta
Quantifying a tide-dominated, wave-, and river-influenced delta in Miocene facies of the Niger Delta basin
A mechanical basis of fault-bend folding
Descriptive systematics of Upper Palaeocene–Lower Eocene pollen and spores from the northern Niger Delta, south-eastern Nigeria
Distribution of Foraminiferal Assemblages in Contemporary Bottom Sediments of Qua-Iboe River Estuary, Southeast Nigeria
Ceramics Properties of Indurated-Shale Quarry Wastes from Abakaliki, Southeastern Nigeria: Application as Raw Materials in Roofing-Tile Production
Estimation of detachment depths and displacements from the area–depth markers of contractional growth structures: Testing the “inverse line” concept
Amplitude variation with angle analysis for deepening of a well planned as an infill opportunity: A case study of a mature oil field in the Niger Delta
Fracture pressure, leak-off tests and Poisson's ratio
Biostratigraphy and sequence stratigraphy of the deep offshore Niger Delta and implications for future hydrocarbon exploration in the Paleogene sequences
Depth to magnetic basement in the Anambra Basin, Benue Trough of Nigeria from aeromagnetic data: A prelude for hydrocarbon exploration
Geomorphometric analysis of seabed pockmarks, offshore western Niger Delta: A case study of the Freeman Field
Quantitative diamondoid analysis indicates oil cosourcing from a deep petroleum system onshore Niger Delta Basin
Interaction between sea-level changes and depositional tectonics: Implications for hydrocarbon prospectivity in the western coastal swamp depobelt, Niger Delta Basin, Nigeria
Characterizing the growth of structures in three dimensions using patterns of deep-water fan and channel systems
Comparison of chemical sediment analyses and field oiling observations from the Shoreline Cleanup Assessment Technique (SCAT) in heavily oiled areas of former mangrove in Bodo, eastern Niger Delta
Active transform faults in the Gulf of Guinea: insights from geophysical data and implications for seismic hazard assessment
Abstract Research in Cretaceous shales from West Africa has demonstrated that significant permeability can develop within shales at shallow depths (<100 m), equivalent to a permeability of >1 m day −1 . Much of the variation in permeability is related to the degree of burial metamorphism, with shales that have been altered and that approach the anchizone having the highest permeability and those that are largely unaltered (early diagenetic zone) having the lowest permeability. However, further research targeting largely unaltered shales dominated by smectite clay has shown that the presence of small igneous intrusions can radically alter the hydrogeology. Twenty-four exploratory boreholes were drilled into smectite-dominated shale and nine of these boreholes were targeted to small dolerite intrusions within the shale. The dolerite was intensely fractured at the intrusion edge, with significant zeolite growth along the fracture surfaces. The permeability in the fractured dolerite was the highest measured in any shale borehole, with transmissivities of up to 60 m 2 day −1 measured from pumping tests. Fracturing was less where dolerite was intruded into sandstones, however, and the measured transmissivity was lower (<0.5 m 2 day −1 ). We postulate that the low permeability and high water content of the shale enabled high pressures to develop during intrusion, facilitating the development of fractures along the intrusion contact zone.