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In this paper tectonics induced syndepositional tensile fracturing, faulting and block kinematics during structural evolution of this tertiary field has been reconstructed and the orientations of present-day horizontal stresses determined. Balanced cross-section using well coordinates and wireline logs correlation to portray the present-day architecture of the deformed geometry and stratigraphy has indicated two flank faults. The stratigraphic section depicts offlapping cyclic sedimentation in the middle to outer neritic environment during the Oligocene – Miocene epoch. Syndeposional shear displacement of the interconnected fractures in NE – SW and NW – SE fault trends indicate the directions of the maximum horizontal stress and present day maximum horizontal stress orientations determined from compressional shear failures in vertical wellbores depict NE – SW, NW – SE and ENE – WSW dominant directions consistent with the major fracture zones in the Gulf of Guinea along which triple-junction rifting into Nigeria’s Benue trough aulacogen had occurred. Recent increase of earth tremors in Nigeria occurring in the NE – SW, NW – SE and ENE – WSW directions when correlated with the two tectonic episodes, the Aptian/Albian epeirogenic tectonism and the late Miocene – Pliocene faulting together with the presentday stress orientations all align in the axes of the major fracture zones that separated South America from Africa indicates that intraplate tectonic reactivation due to migration of the African plate along the major fracture zones that cut into Nigeria is imminent.

sdrp journal of earth sciences and environmental studies

Paleokinematic reconstruction and wellbore breakout analysis of in situ stress orientation in a Niger Delta Oilfield: Implications for tectonic reactivation in Nigeria