Origin of asphalt and adjacent oil stains in Lower Cretaceous fractured limestones, Deep Sea Drilling Project Leg 77.

Abstract

The oil-stained and asphaltic material appears to be a post-migration alteration product of a mature oil that has migrated from source rocks deeper in the section, or from stratigraphically equivalent but compositionally different source-facies down-dip from the drill site. Further, hydrocarbon of the altered petroleum residues were shown to be similar to Sunniland-type oils found in Lower Cretaceous rocks of South Florida.-from Authors