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Aptian–Albian Transition in Central Tunisia:Tectonosedimentary and Paleogeographic Records

Journal of Earth Science 2014年第5期25卷 787-798页

作者： Imen Marco ferid dhahri Taoufik Haji Noureddine Boukadi University of Tunis El Manar Faculty of Sciences of Tunis Tunis 2092 UR11ES15 Sedimentary Environments Petroleum systems and reservoirs characterization University of Gafsa Faculty of Sciences de Gafsa Gafsa 2112 Tunis

The Aptian-Albian series are characterized, in Tunisia, by several variations in subsidence rates and records discrete unconformity between Albian and Aptian in central and southern Tunisia. In central Tunisia Upper Aptian regressions were sustained until the beginning of Albian with a low sea level stand. In this paper, wells data gathered from central Tunisia exposes well expressed Aptian-Albian hiatus associated to several partial sedimentary gaps, erosion surface and unconformities and correlated with the ＂Aptian Crisis＂ highlighted at the Tethyan scale. This latter is coeval with an extensional regime in concurrence with the African rifting responsible for halokinesis movements and magmatism and leaded to the establishment of paleoreliefs as much as tilted blocks and half grabens in central Tunisia. Deposition shows regional hiatus and lateral transition from platform facies to south to, open marine facies to the north. The structural configuration of this domain within normal faulting, horsts and grabens leaded to the establishment of several distinct basins with different subsidence rates. Discordances occur specially around and upward uplifted blocks and emerged land and are especially associated with Aptian reef, karsts and shallow marine facies. They are unconformably overlaid by the transgressive open marine facies of Albian-Cenomanian series acknowledged as source rock in Central Tunisia. In addition, the reefal Aptian facies is considered a potential reservoir rocks in central Tunisia and it is frequently associated to mineralization and Hydrocarbure reservoirs.

关键词： central Tunisia Aptian Albian Hiatus well data.

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