The reactivated normal faults, conjugate faults and transtensional structures emplaced by The structural style of the study area is characterized by normal faults with a variation in throw direction and fault-related folds. Neotectonics of the offshore sirte basin Shows of natural gas were observed in the late s, but World War II interrupted exploration efforts.
Rifting commenced in the Early Cretaceous, peaked in the Late Cretaceous, and ended in the early Cenozoic, resulting in the triple junction within the basin. It was the hometown of Gaddafi.
Geologic setting[ edit ] The Sirte Basin province is considered to be a type locality of a continental rift extensional area and is referred to as part of the Tethyan rift system.
Normal faults of Pre-Messinian age lie broadly parallel to the coastline in the South-east of the study area and dip basinward. Land area[ edit ] Topography of Libya The land area in the Sirte basin is characterized by desert steppes and includes eolian deposits from the Rebiana and Kalansho Sand Sea of the Sahara Desert.
The structural regime has been reviewed in relation to regional tectonic events in the Western Mediterranean. To the south, the Nubian Swell is the stable continental basement for this rifted basin. The Italian government embarked on geologic investigations of the area and produced a geologic map in In the Sirte Basin the dominant trap style is structural 84 percentwith the remainder considered stratigraphic or a combination of the two.
The Pelagian province to the west, particularly the pull-apart basins of the Sabratah Basin and extending along the South Cyrenaica Fault Zone SCFZ and the Cyrenaica Platform to the east, is strongly influenced by extensional dextral strike-slip faulting.
These horsts and grabens extend from onshore areas northward into a complex offshore terrane that includes the Ionian Sea abyssal plain to the northeast.
As examples of combined traps, bioherm developments in the Paleocene Zelten Group are found on horst blocks, and clastic stratigraphic traps such as at Sarir or Messla field are superimposed on structures. The major structural trend is NW-SE trending, with some Neogene structures inheriting the trend of the pre-existing rift structures.
Oil and gas trapped within the porous rock unit migrate to a high point in the structure because of their low density. This source rock contains minor amounts of carbonates Tagrifet limestone.
Competitive bidding for concessions was subsequently permitted by two mineral laws passed in andand exploration by EssoMobilTexas Gulf, and others commenced with seismicmagnetic, and gravity data being collected.
In the north-eastern part, deformation of Plio-Quaternary sediments is due to differential compaction in underlying incised channels of Messinian age. Named after the town in Libya, Sirte. This plain is underlain by oceanic crust that is being subducted to the north and east beneath the Hellenic arc.
The basin is floored by a northwest-southeast-trending mosaic of narrow horsts and grabensan important structural characteristic that distinguishes it from the adjacent intracratonic KufraMurzukand Ghadames basins.
Analysis of the structural and stratigraphic interaction observed in the study indicates that stratigraphic thickness variations were controlled by faulting.
Home Essays Neotectonics of the The extreme western part of the study area in the adjacent Misurata Basin, is marked by transition from purely extensional to transtensional processes.
The transtensional structures, in the Misurata Basin to the west, are interpreted to be related to regional plate reorganization during Neogene times.
Libya nationalized its oil industry inand some American oil companies began withdrawing infollowing a US trade embargo. Neotectonics of the Offshore Sirte Basin Topics: GeologyMediterranean SeaMiocene Pages: 2 words Published: September 9, This study utilizes thirty-four intersecting, multi-channel regional 2D seismic lines from the Offshore Sirte Basin, Libya, to assess the structure and stratigraphy from the Miocene to the Quaternary.
Additional sanctions applied by the US Sanctions Act of were relaxed in TOC of this sequence ranges from 0. Libya started exporting oil in and by it was the 7th largest oil-producing nation in the world.
Overall drilling density of the basin is 3. From to giant oil fields were discovered. The Late Cretaceous rifting event is characterized by formation of a sequence of northwest-trending horsts and grabens that step progressively downward to the east; the Sirte Trough represents the deepest portion of the basin.
Integrating the evidence obtained from the seismic data, it is proposed that the Neotectonic evolution of the Offshore Sirte Basin is controlled principally by rapid subsidence and re-activation of pre-existing major faults and salt-related thin-skinned tectonics.
The South-central part of the study is dominated by Mid-Miocene. Recent indications of hydrocarbons within grabens suggest that these areas have potential as well as clastic reservoirs beneath the carbonate reservoirs in the Central Sirte Basin.
OMV has announced the discovery and successful testing of oil in the A1-NC exploration well in Block NC The well is located in the offshore Sirte Basin, 40 km southwest of Benghazi. A major marine transgression occurred in North Africa during the Late Cretaceous, depositing marine strata in some regions which had been dominated by terrestrial deposition or erosion since Permian times.
An evaporite-shale-dolomite succession has been discovered at outcrop at the northern margin of the Kufra Basin in southeast michaelferrisjr.com by: 4. The Sirt Basin contains some sixteen giant oil fields with about Billion barrels of proven oil in place recoverable reserves. The two principal source rocks in the Sirt Province are the Upper Cretaceous Rachmat Shale and Sirt Shale.
The Nafoora oilfield is situated on a major tectonic uplift in the eastern Sirte Basin, the Amal-Nafoora High. Four oilfields have been discovered on this uplift – Amal, Rakb, Augila and Naffora.
The Sirte basin province of Libya – Sirte-Zelten total petroleum system.
U.S Geological Survey Bulletin F, 29 pp. Anketell, J.M., Structural history of the Sirt basin and its relationship to the Sabratah basin and Cyrenaican platform, northern Libya. Sirte Basin, situated in the north-central part of Libya, is the largest oil producer in Africa. It was developed as a series of NW-SE trending It was developed as a series of NW-SE trending horsts and grabens (platforms and troughs) by the collapse of the Sirte Arch in Lower Cretaceous time.Neotectonics of the offshore sirte basin