Seismic attributes-aided characterization of margin backstepping and ad-vance along isolated carbonate sequences, Sirt Basin, Libya

Abstract EN

Isolated carbonate platforms are common and contain significant hydrocarbon ac-cumulations, particularly in the tectonically complex Sirt Basin in Libya.

This study investi-gates the margin cyclicity of two carbonate stratigraphic sequences developed on an isolated carbonate platform in the NW Sirt Basin using 3-D post-stack seismic volume and wireline log data.

The two sequences (sequences 4 and 5) are bounded by unconformity surfaces from the base and top.

Seismic attributes show that each sequence displays a cycle of margin back-stepping followed by margin advance for several hundred meters.

This study concludes that the margin backstepping and advance are mainly influenced by sea-level changes.

A rapid sea-level rise caused the backstepping, whereas slow sea-level rise caused the margin ad-vance.