The El Garsi open block lies in Eastern offshore Tunisia where water depth is less than 200m.
The GARSI block is located within the Gulf of Hammamet. It is part of Halk el Menzel Platform, which is a stable structural zone since the Cretaceous. The block is transected by two major Tertiary grabens (Jriba and Kuriate), trending NW-SE to E-W to the south by E-W Kuriate Tertiary graben and affected by NW-SE and E-W fault systems, associated with wrench movements.
Reservoirs and Seals
Main reservoirs are:
- The Senonian Abiod chalky limestone which produce oil and Gas in several fields within the Gulf of Hammamet (Maamoura, Zinnia) and tested gas in Tazerga field.
- Langhian Ain Grab limestone which producing oil in Baraka Oil Field.
- Mid-Miocene Birsa sandstones, producing oil in Tazerka, Oudna, Birsa, Cosmos and Yasmin fields, at least in the eastern part of the block.
- The main source rock recognised within the El Garsi Block is the Albian Mouelha Lower Fahdene shales.
- The Cenomanian - Lower Turonian Bahloul and Ypresian Bou Dabbous dark limestones are considered as secondary source rocks within the block.
The main trap types include faulted blocks, anticlines, faulted anticlines and rollover structures in the grabens.