Abstract:

In this study, cross section balancing and restoration of 2D seismic reflections acquired from the Dehui depression is utilized in defining the structural evolution of the identified stratigraphic units and to further detail out the inverted structures which had occurred as a result of fault reactivated inversion. Inversion which occurred in the Late Cretaceous had led to a region-wide extension and compression with re-occurring reactivation of pre-existing normal faults resulting in the formation of complex inverted structures. The evolution of the pre-existing normal faults had a significant controlling influence on the deposition of sediments which defined the depressions architecture, such that it had led to the formation of half-grabens. Reactivation of pre-existing normal faults had resulted in the inversion style being depicted as a moderate inversion. Displacement along the reactivated pre-existing normal faults had also led to shortening within the syn-rift succession sequence, resulting in the structural deformation being largely accommodated by asymmetrical fault-related folds.