The Bight Basin, Evolution & Prospectivity I: gravity, deep seismic & basin morphology

Abstract

Definition of the basement architecture within the Ceduna Sub-basin is poorly understood due to the depth of the basin and limited deep crustal geophysical datasets. This study uses seismic interpretation of BightSPAN™ deep crustal seismic lines combined with 2D forward models of the gravity to define the basement architecture in the Ceduna Sub-basin. Gravity forward models identify two depocentres with maximum depths of 25 km overlying thinned continental crust. Syn-rift sedimentary packages are several km thick and underlie up to 10 km of post-kinematic Cretaceous deltaic sequences. Regional Moho models contain only sparse data points offshore and isostatic residual gravity data suggests s..