Geochemical
Characteristics of Source Rocks, and the Hydrocarbon Family in the Eastern
Abulkhier, Idris1 (1) Waha oil company, Tripoli, Libya
Identifying the characteristics source
rock sediments and the knowledge of the petroleum generation is well known in
the exploration success of an area. Detailed evaluation of the qualities and
the maturation levels of the Upper and Lower Cretaceous potential source rocks
in the eastern Sirte basin was the primary objective
of this study. In this study cutting samples and core samples from more than
fourteen wells have been analyzed geochemically and paleonologically. Geochemical data from previous studies
and the result of oil samples analysis from selected wells have also been
incorporated. The work has been concentrated on selected intervals of Lower
Cretaceous sediments, some samples from Upper Cretaceous sediments and younger
units were also analyzed to identify the source rocks and their maturity
levels. The results of this study indicate that both petroleum systems (Upper
and Lower Cretaceous rocks) have a very good source section with high potential
for oil and gas generation. Both systems have organic facies
derived from marine and terrestrial organic input. The Geochemical analysis
including carbon isotope, gas chromatograph, and mass spectrometry indicates
that the Hydrocarbon extracted from Pre Upper Cretaceous have a positive
correlation with Hydrocarbon found in the Lower Cretaceous Nubian sandstone.
The Geochemical modeling has demonstrated that source rock in the deeper parts
of the eastern Sirte basin is mature for oil and gas
generation. The hydrocarbons were derived from different organic facies and grouped into four oil families, oil from Upper
Cretaceous, oil from Lower Cretaceous, oil from Triassic, and oil from mixed or
unknown source rocks.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California