GEOGRAPHICAL
SETTING
The Rwis block is located in South-Eastern onshore Tunisia,
about 30 km East of Zarzis city. The Rwis block is situated
between Ezzouia and El Biban productive oil fields.
ACREAGE
160 km².
PREVIOUS
EXPLORATION
About 122 km of seismic data
were acquired, with different vintages, the first seismic
program was acquired in 1973 by Mobil, and the latest was
acquired by Marathon in 1994. No well was drilled within the
block.
GEOLOGICAL
SETTING
The tectonic feature in this area is dominated by NW-SE
network fault system. Therefore, most of the leads and prospects
are three-way-dip closure. These structures were subject of
series of compressional events through Upper Cretaceous to
Tertiary time.
HYDROCARBON
POTENTIAL
Reservoirs :
● The Upper Cenomanian Zebbag Dolomite exhibit a good
reservoir parameters generally enhanced by fracturing. This
reservoir made of pervasive dolomite produce, oil in the nearby
Ezzaouia and El Biban fields.
● The shallow marine sandstone of the Upper Jurassic M'Rabtine
formation constitute the major reservoir in Ezzaoui oil field.
● The recent discovery of oil within the dolomitic and sandstone
facies of the Lower Cretaceous Meloussi formation in the Robbana-1
well on Jerba Island; highlight this reservoir as a promising
new target in the block.
● The secondary objectives in the block include the Barremian
Sidi Aïch sandstone Formation and The Middle Jurassic Krachoua
Dolomite.
The seal of his reservoirs is provided by the intraformational
shales which exhibit a high seal capacity.
Source Rocks :
The geochemical data indicate that the oil in the nearby
Robbana, Ezzaouia and El Biban productive fields derived from
two possible source-rocks: The organic-rich shales interval of
the Cenomanian Zebbag Formation and the Callovian organic-rich
shales.
Traps :
The main trap types include faulted blocks (three-way dip
closure), anticlines and stratigraphic traps related to lateral
facies change.
SEISMIC
