Seismic Attributes Aided Characterization of Margin Backstepping and Advance along Isolated Carbonate Sequences, Sirt Basin, Libya

• Muneer A. Abdalla

  Department of Geology, Faculty of Science, Omar Al-Mukhtar University, Al Bayda, Libya

  Author

Isolated carbonate platforms are common and contain significant hydrocarbon accumulations, particularly in the tectonically complex Sirt Basin in Libya. This study investigates 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 backstepping 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 advance.

Abadi, A. M., Van Wees, J.-D., Van Dijk, P. M., & Cloetingh, S. A. (2008). Tectonics and subsidence evolution of the Sirt Basin, Libya. AAPG bulletin, 92(8), 993-1027.

Abdalla, M., & Yang, W. (2021). Progradation of a middle Eocene carbonate slope system, Assamoud Field, Sirte Basin, north central Libya–Implications on the dynamics of lateral growth of isolated carbonate platforms. Marine and Petroleum Geology, 129, 105119.

Ahlbrandt, T. S. (2001). The sirte basin province of Libya: sirte-zelten total petroleum system. US Department of the Interior, US Geological Survey.

Barnes, A. E. (2016). Handbook of poststack seismic attributes. Society of Exploration Geophysicists.

Becker, R., House, M., & Kirchgasser, W. (1993). Devonian goniatite biostratigraphy and timing of facies movements in the Frasnian of the Canning Basin, Western Australia. 293–321. High resolution biostratigraphy. Geological Society, London, Special Publication, 70, 357.

Blanchon, P. (2011). Back-stepping. Encyclopedia of Modern Coral Reefs: Structure, form and process: New York, Springer-Verlag, 77-84.

Guiraud, R., & Bosworth, W. (1997). Senonian basin inversion and rejuvenation of rifting in Africa and Arabia: synthesis and implications to plate-scale tectonics. Tectonophysics, 282(1-4), 39-82.

Hallett, D. (2002). Petroleum geology of Libya: BV Elsevier. Amsterdam, The Netherlands.

Mitchum Jr, R. (1977). Seismic stratigraphy and global changes of sea level: Part 11. Glossary of terms used in seismic stratigraphy: Section 2. Application of seismic reflection configuration to stratigraphic interpretation.

Mouzughi, A., & Taleb, T. (1981). Tectonic Elements of Libya (1: 2,000,000). National Oil Corporation of Libya.

Roohi, M. (1996). A geological view of source-reservoir relationships in the western Sirt Basin. Geology of the Sirt Basin: Amsterdam, Elsevier, 2, 323-336.

Schlager, W. (2005). Carbonate sedimentology and sequence stratigraphy. SEPM (Socity Sedimentary for Geology) USA.

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