Print this pagePermian Reefs and Triassic Pinch Out: Emergent Plays in Central - South Tunisia
SILENZI, SANDRO, SLIMANE OUAZAA, ERWIN UNGER, and JAMEL LAZREG
Recent regional assessment in Central-South Tunisia, based on seismic and well data, led to the recognition of two emergent plays: the Permian reefs and the Triassic sandstone pinch out.
The Lower Permian reef play is characterized by a series of seismic anomalies developed during the Late Paleozoic opening of the Chotts and Jeffara Basins, to the north and east of the Tunisian-Algerian Telemzane Arch. These reefs are well sealed by Upper Permian shales ; they may be sourced by both the Upper Permian organic-rich shales and locally by the underlying Upper Silurian-Lower Devonian black shales.
The Triassic pinch out consist of both sedimentary thinning of the Mid-Upper Triassic sandstones, developed on both sides of the Late Paleozoic uplifted Telemzane Arch. The pinch out are well sealed by the Upper Triassic evaporites. To the south of the Telemzane Arch, they are sourced, by long distance migration, from the Silurian and the Devonian source rocks of the Ghadames Basin. To the north of the Arch, the Triassic sandstone pinch out may be sourced from the Upper Silurian-Lower Devonian and Upper Permian organic-rich shales.