The Tamazret block is located in south eastern onshore Tunisia, at the vicinity of Matmata city.
The TAMAZRET block is located on the northern edge of the Sahara platform, within the Permian Basin. The area is limited towards the east by the Jeffara fault. The Permian Basin was developed along a NW-SE strongly subsiding axis, passing across the western portion of the Tamazret Block. Along this axis, over 4000m of Permian sediments were accumulated. Further, the area is characterised by a transcurrent N-S trending system faults and a secondary NW-SE trending system faults defined to eastern part of the block (near Jeffara fault).
Reservoirs and Seals
- The main reservoirs in this block are biohermal Late Permian. The Late Permian is the only Paleozoic system outcropping in Tunisia toward the eastern part of Tamazret Block, at Djebel Tebaga near the town of Mednine. These reefs are well sealed by Upper Permian shales.
- The Triassic Kirchaou sandstones were considered as a second reservoir target in the block at least in western portion of the block. The evaporitic facies which surmounted the Kirchaou reservoir was considered as a good seal.
- The Ordovician sandstones are considered as an emerging play within the block. These reservoirs are gas and condensate producing in Sabria and El Franing fields located to the east. The intraformationnal shales are considered as a good seal for this reservoir.
- The Upper Silurian-Lower Devonian Fegaguira Hot shale and the Ordovician Azel shale are the main source rocks.
- The Permian shows locally good source rock characteristics.
- The trapping system in the zone includes tilted fault blocks, faulted anticlines, low amplitude anticlines and stratigraphic traps (pinch out, channel fill within the TAGI reservoir, unconformities and patch reef within Upper Permian).