Home / Vol. 24 (2019)

NEW INSIGHTS ON MESOZOIC DEPOSITIONAL SEQUENCES AND HYDROCARBON SYSTEMS, FROM JIFFARAH ESCARPMENT TO LIBYAN OFFSHORE BASINS

Ibrahim Y. Mriheel

Libya

DOI: 10.68482/prj.2019.24.001 · Published Dec 2019 · Section: Exploration · Pages: 1–8

Abstract

This paper provides the results of outcrop data analyses across the Jiffarah Escarpment (JE). A new Mesozoic stratigraphic scheme and sequence stratigraphic framework are proposed which could be used both in the Libyan onshore and offshore. Chronostratigraphic chart has been constructed across the JE, in E-W direction. The chart demonstrates the way in which depositional sequences and sedimentation history vary across the JE via time. The exposed stratigraphic succession at JE ranges in age from Middle Triassic to Late Cretaceous. This Mesozoic succession represents two second-order sequences (Triassic to Middle Jurassic; and Cretaceous), both depositional sequences are bounded by major tectonic unconformities. The lower sequence (SI) is bounded by the Hercynian unconformity at the base of the Triassic and MFS of SI is placed in the Bathonian. The Cretaceous sequence (SII) is bounded by the Cimmerian-Austrian unconformities at the base and the Albine unconformity at the top. Deposition of the JE Mesozoic mega-sequences took place during several rifting phases effecting the Mediterranean basins, starting from Triassic and passing through the Jurassic and terminated during Early Cretaceous. The region witnessed compressional phases during the Albine Orogeny which lead to uplifting and erosion of wide areas along northern African margin. Stratigraphic correlations made on Mesozoic sequences reveal a complex sequential organization and also account for the impact of the Hercynian uplift and paleotopography on eastward truncations of Triassic-Middle Jurassic sequence. Post Albian deposits developed on a smoothed topography associated with a regional transgression and can be easily correlated over the JE. Reservoir and source rocks potential of the outcropping Triassic-Cretaceous sequences along JE reveal the importance of the deeper thermogenic petroleum systems located in the subsurface of the adjacent Gabes-Tripoli Basin. The exposed Miocene sequence along eastern JE represent good analogue to the proven biogeneic Neogene gas system in the adjacent Mediterranean basins and support the assumption of discovering similar plays in the Libyan offshore basins.

Keywords

Mesozoic Sequences, HC Systems, Jiffarah Escarpment (JE), Libyan Offshore Basins

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