Open Blocks: AYACHA

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GEOGRAPHICAL SETTING

Central onshore Tunisia.

ACREAGE

4240 Km².

PREVIOUS EXPLORATION

About 980 km of seismic have been recorded and no well has been drilled within the block.Surface geological work and wells drilled around the block provide addiotional data.

GEOLOGICAL SETTING

The Ayacha block covers parts of the Central and Southern Atlas.It comprises northeast –southwest trending folds to the north and east – west trending folds to the southwest, the two trends being separated by northwest –southeast Gafsa wrench fault.The area was affected by Early Mesozoic block faulting, followed by Mesozoic platform development with mixed facies .The northern part of the block emerged by Late Cretaceous as part of the Kasserine Island.

HYDROCARBON POTENTIAL

Reservoirs :
The Jurassic carbonate constitute the primary target  within the block  as indicated by  the presence of   good oil shows in the Limagues-1well drilled immediately to the south. The deep intervals such   Triassic  and Paleozoic strata may constitute  promising plays.

Source Rocks :
The Jurassic Middle Nara shales, Uppermost Jurassic – Lowermost Cretaceous Sidi Khalif shales and locally Mid –Cretaceous Bahloul laminated limestones are potential source rocks.

Traps :
The main taps may include fault blocks, anticlines and facies-controlled traps.

SEISMIC

DATE	SURVEY	OPERATOR	SOURCE	NB of KM	FIELD CONTRACTOR
1973-74	MT ,MTB	MOBIL	Weight Drop	310	RAY GEOPHYSICAL
1982-83	GSB	AGIP	Vibro&Dynamite	670	GSI

 

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