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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Target Exploration, Target Exploration, 65 Kenton Court, London W14 8NW United Kingdom ,
phone: +44 207 371 2240, [email protected]
A 3600 Km2 area covering a 14,000 feet thick Upper Cretaceous-Miocene graben and parts of two platforms in Sirte Basin
was studied for undeveloped fields opportunities and remaining E&P potentials. The study found that a number of early
discoveries remained un-produced including a field with >100 MMSTBO of reserves. The tectonic evolution of the studied
area can be divided into five stages: 1. Pre-rift intra-cratonic Paleozoic basin stage, Hercynian uplift and regional Triassic
and Jurassic erosion, 2. Lower Cretaceous incipient Sirte Basin rift, 3. Upper Cretaceous syn -Sirte Basin rift, 4.
Maastrichtian transitional stage and 5. Paleocene post-Sirte Basin rift sag. The tectonic history overprinted four groups of
evolving local structures: 1. Pre-rift structural
anomalies, 2. Syn-rift
structural
anomalies, 3. Transitional stage
structural
anomalies and 4. Post-rift
structural
anomalies. The operating petroleum
system
is charged by the source rocks of the
Upper cretaceous Sirte Shale, and it can be divided into three subsystems on basis of Kerogen type, domain and time of
maturation. In all three, the presence of proximal source rocks, and any combination of the seven proven reservoirs within a
voluminous
structural
closure does not create a successful
trap
without the presence of an effective overlying Upper
Cretaceous Sirte Shale or Palaeocene Hagfa Shale seals, which form the critical factors of most successful traps in the
studied area. The petroleum
system
of this graben can be used as a model for Sirte Basin grabens.