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Abstract

The Upper Jurassic succession exhibits lateral variations in both thickness and lithology over the Abu Dhabi area. These variations are related to eustatic changes in sea level, structural growth of the Qatar Arch and Mender-Lekhwair high, spreading of the Neo-Tethys, and local diapiric movements.

The Upper Jurassic section in the eastern part of Abu Dhabi is subdivided, from bottom to top, into the following formations and reservoirs: Tuwaiq Mountain Formation with Hadriya reservoir, Hanifa Formation with Hanifa reservoir in the southeast area, Jubaila dense section, and the Asab-Asab equivalent with the Asab Oolite reservoir. In the western area, the section contains the Tuwaiq Mountain, Hanifa, Jubaila with Arab D reservoir at the top overlain by the Arab Formation with Arab A, B, and C reservoirs and the Hith anhydrite, locally overlain by the Manifa reservoir at the top of the Hith Formation.

The Late Oxfordian structural growth of the Mender-Lekhwair high and the Qatar Arch led to the development of the main intrashelf basin in between, where the Hanifa Formation was deposited. The Hanifa is the main source rock for the Arab and the Thamama hydrocarbons.

Approximately 75% of the present structural configuration of Abu Dhabi onshore area resulted from the late Cretaceous structural compressional movements due to the Oman Nappes overthrust zone. The Late Cretaceous subsidence in the Falaha trough in central Abu Dhabi enhanced organic and inorganic gas generation.

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