Neoproterozoic (infracambrian) - Paleozoic Total Petroleum Systems of Arabian Peninsula; an Overview

Adel AL-Johi, Abdulaziz Al-Laboun

Abstract


The Neoproterozoic (infracambrian)-Paleozoic total petroleum systems are considered. as major TPS in Arabian Peninsula. The Neoproterozoic TPS located in subsiding rift basin which has been formed during the infracambrian. It is represented generally by Huqf Supergroup. The Infracambrian is consisting of two sub-TPSs. The North Oman Huqf/“Q”–Haushi (!)(201401) TPS involving Ghaba-Makarem Combined Structural Assessment Unit (AU), has been identified for the Ghaba Salt Basin Province. Second TPS is North Oman Huqf–Shu’aiba (!) TPS (201601); Fahud-Huqf Combined Structural AU in Fahud Salt Basin Province. In both provinces, hydrocarbons were generated from Infracambrian buried source rocks pertaining to the Huqf Supergroup. Oil in the Ghaba Salt Basin may be linked to at least two distinct Huqf source-rock units: a general North Oman Huqf-type oil source and a more dominant “questionable unidentified source” or “Q”-type Huqf oil source. For the (201401) TPS migration is. vertical and lateral into Permian-Carboniferous Haushi Group carbonate- clastic reservoir within structurally complex traps. The North Oman Huqf-Shu’aiba TPS (201601) and Fahud-Huqf Combined Structural AU mostly produce gas from Middle Cambrian to Lower Ordovician clastic reservoirs of the Haima Supergroup and the traps are mainly structural. Paleozoic TPS in the Arabian Peninsula encompassed many systems that extend regionally within the Gulf Countries. The Paleozoic TPS consisted of Qusaiba-Paleozoic TPS (202101), Qusaiba/Akkas/Abba/Mudawwara TPS (202301); and the Silurian Qusaiba TPS (201903) which widely distributed within greater Rub ‘al Khali Basin. All Paleozoic TPSs sourced in basal Qusaiba hot shale. The reservoir rocks are mainly sandstone of the Lower Permian Unayzah and Devonian Jauf Formations in center Arabia; and also Permian Unayzah sandstone in north center Arabia and Rub ‘al Khali Basin but carbonate in Northern Qatar Arch Extension UA. The traps are mostly structural with stratigraphic and the seals are dominant anhydrite, shale, salt and tight carbonates.

Keywords


Neoproterozoic; Paleozoic; Total petroleum system; Arabian Peninsula

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