Combined geophysical and tectono-stratigraphic models to characterise Jurassic syn-rift petroleum systems in the Shushan Basin, northern Egypt

Albrkawy, Ahmed I. and Alves, Tiago M. ORCID: https://orcid.org/0000-0002-2765-3760 2025. Combined geophysical and tectono-stratigraphic models to characterise Jurassic syn-rift petroleum systems in the Shushan Basin, northern Egypt. Petroleum Geoscience 10.1144/petgeo2024-095

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Abstract

Northern Egypt and its Western Desert region are hydrocarbon provinces recording important Mesozoic extension. Yet, Jurassic and older syn-rift strata are still poorly characterised in these two areas, and particularly so in the onshore Shushan Basin. This work uses seismic-reflection data tied to borehole and geochemical data to investigate three (3) main Jurassic syn-rift seismic and depositional megasequences in the Shushan Basin: i) a Lower Jurassic retrogressive megasequence, ii) a Middle Jurassic prograding megasequence, and iii) an Upper Jurassic retrogressive megasequence. These megasequences, defined for the first time in this work, accompanied Late Triassic-Early Cretaceous tectonic extension, with deposition occurring in proximal environments such as rivers, lakes and deltas. Terrigenous organic matter was preserved over long periods of time in such environments, within clay-rich source intervals, as confirmed via organic geochemical analyses. Significantly, the presence of kerogen of Types II and III, and a total organic content of up to 3.91%, suggest good hydrocarbon source-rock potential in specific Jurassic intervals. One-dimensional burial models suggest that, with sufficient burial, these source intervals generated oil and gas with a recorded maximum yield in the Early Miocene. As a corollary, this work indicates that conventional and unconventional hydrocarbon exploration targets exist in the Shushan Basin. Results show Middle Jurassic shale-rich intervals to be prime tight-gas targets, while Upper Jurassic carbonate units are promising conventional reservoirs in both the central and southern parts of the basin. The high formation temperatures recorded show that geothermal options are also feasible for deep wells, expanding the economic importance of northern Egypt.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Schools > Earth and Environmental Sciences
Publisher:	The Geological Society
ISSN:	1354-0793
Date of First Compliant Deposit:	19 December 2025
Date of Acceptance:	1 December 2025
Last Modified:	23 Dec 2025 09:30
URI:	https://orca.cardiff.ac.uk/id/eprint/183384

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