Abstract: Early Structuring, Paleo-Emersion and Porosity Development: A Key for Exploration of the Aptian Serdj Carbonate Reservoir in Tunisia
OUAHCHI, ABDERRAHMEN, ALI M'RABET, JAMEL LAZREG, FAOUZI MESSAOUDI and SLIMAN OUAZAA, ETAP - Tunis, Tunisia
The Aptian Serdj carbonates are proven reservoirs in Tunisia as demonstrated by numerous oil and gas discoveries in both onshore (Douleb) and offshore (Mahdia) Tunisia. However, in some wells, only hydrocarbon shows were encountered due to poor reservoir quality.
Sedimentological and regional petroleum geology investigations, based on outcrop and subsurface data, have led to the definition of the Aptian Serdj play attributes, particularly the reservoir petrophysical properties.
Porosity development is primarily linked to early vadose and phreatic diagenesis (including dissolution, local karstification, dolomitization and dedolomitization) developed during the Aptian-Early Albian emersions.
Therefore, early structuring and subsequent emergence and unconformity development are major factors to be considered in the exploration of the Aptian target in Tunisia.
AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah