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7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia, 2010Printed on recycled paper
IntroductionThe U.S. Geological Survey (USGS) assessed the potential
-
logicprovinces of North AfricaSirte Basin in Libya and Pela-
gian Basin in Tunisia and western Libyaas part of the USGSWorld Petroleum Resources Project1). The Sirte Basinoriginated as a Cretaceous rift that evolved into a post-rift basindominated by
-grained clastic
deposition introughs (Ahlbrandt, 2001; Hallett, 2002). The Pelagian Basin wasdominated by Mesozoic
and Cenozoic subsidence related to tecto-
nism along the northern margin of the African plate (Klett, 2001).One total petroleum system (TPS)
PelagianBasin Province.
The SirteRachmat Composite TPS in the SirteBasin Province contains the post-rift
ConiacianCampanianSirteRachmat organic-rich shale/marl, which was deposited introughs across
the Sirte Basin during the early phase of thermalsubsidence (Ahlbrandt, 2001; Hallett, 2002). Major
reservoirs inthe Sirte Basin Province include syn-rift continental sandstonesand post-rift shallow-marine carbonates, with shales and evapo
-rites acting as seals for hydrocarbon reservoirs (Ahlbrandt, 2001;Hallett, 2002). Two assessment units
withinthe SirteRachmat Composite TPS: the Onshore Sirte Carbon-
Klett(2001) were retained for this assessment. The JurassicCretaceousComposite TPS consists of
-marine shales that migrated into JurassicCretaceous shal-
low marine limestones and Upper Cretaceous fractured deep-water chalks. Seals include Jurassic and
this TPS, the JurassicCre-
taceous Structural/Stratigraphic AU, based on Klett (2001). TheBou Dabbous Cenozoic TPS containsthe Eocene Bou Dabbousorganic-rich shale, with hydrocarbons that migrated into lower and middle
Eocene shallow-water limestones that are sealed by
Using a geology-based assessment methodology, the U.S.Geological Survey estimatedmeans of 3.97 billion barrels of undiscovered oil, 38.5 trillion cubic feet of undiscovered
natural gas, and 1.47 billion barrels of undiscovered natural gas liquids in two provinces ofNorth Africa.
Figure 1.Locations of the Sirteand Pelagian Basin Provinces,North Africa. AU, assessment unit.
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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t
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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Assess
ment
of
Undisc
overed
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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Oil and
Gas
Resour
ces of
Libyaa
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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nd
Tunisia
, 2010Printed on recycled paperIntroductionThe U.S. GeologicalSurvey (USGS)
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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assessed the
potentialfor undiscovered
conventional oil and
two geo
-logic provinces of
North AfricaSirte
Basin in Libya and
Pela
-
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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gian Basin in
Tunisia and westernLibyaas part of
the USGSWorldPetroleum
Resources Project
1). The SirteBasinoriginated as a
Cretaceous rift thatevolved into a post-
rift basindominated
by thermal
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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subsidence; it is
characterized bycarbonatedeposition
on high blocks and-grained clastic
deposition introughs
(Ahlbrandt, 2001;Hallett, 2002). The
Pelagian Basinwasdominated by
Mesozoic and
Cenozoic
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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subsidence related
to tecto-
nism along thenorthern margin of
the African plate
(Klett, 2001).Onetotal petroleum
system (TPS) wasthe
SirteBasin Province,
and two TPSs were
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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the PelagianBasinProvince. The
SirteRachmatComposite TPS in
the SirteBasin
Province containsthe post-rift
ConiacianCampan
ianSirteRachmat
organic-rich
shale/marl, which
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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was deposited
introughs across theSirte Basin during
the early phase ofthermalsubsidence
(Ahlbrandt, 2001;
Hallett, 2002).Major reservoirs
inthe Sirte BasinProvince include
syn-rift continental
sandstonesand post-
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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rift shallow-marine
carbonates, withshales and evapo
-rites acting as sealsfor hydrocarbon
reservoirs(Ahlbrandt,
2001;Hallett, 2002).Two assessment
units (AU) were
withinthe
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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SirteRachmat
Composite TPS: theOnshore Sirte
Carbon-ateClastic AU and
the Offshore SirteBasin AU.Within
the Pelagian Basin,two TPSs as
Klett(2001) were
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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retained for this
assessment. TheJurassicCretaceous
Composite TPS
from Jurassic and
Cretaceousdeep-marine shales that
migratedinto JurassicCretac
eous shal
-
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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low marine
limestones andUpper Cretaceous
fractured deep-water chalks. Seals
include Jurassic and
Cretaceous shalesandevaporites. One
for this TPS, the
JurassicCre
-
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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taceous
Structural/Stratigraphic AU, based
on Klett (2001).TheBou Dabbous
Cenozoic TPS
contains the EoceneBou
Dabbousorganic-rich shale, with
hydrocarbons that
migrated into
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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lower and middle
Eocene shallow-water limestones
that are sealed byUsing a geology-based
assessmentmethodology, theU.S.GeologicalSurvey estimatedmeans of 3.97
billion barrels
7/29/2019 Assessment of Undiscovered Oil and Gas Resources of Libyaand Tunisia
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of undiscovered
oil, 38.5 trillioncubic fe