The Triassic Middle and Upper Mahil Members in the Oman Mountains represent outcrop equivalents of the Sudair and Jilh Formations. This study focuses on sedimentologic descriptions, sequence stratigraphic interpretations and correlations of 8 outcrop sections around the area of al Jabal al-Akhdar in the Sultanate of Oman. In the Oman Mountains, the facies were deposited in a predominantly restricted inner ramp setting. In more central parts of the Arabian Plate, the Sudair and Jilh Formations are traditionally known to form important seals for hydrocarbon accumulations in underlying Permo-Triassic sequences. However, along the former basin margin, represented by the outcrops in the Oman Mountains, several potential reservoir units could be identified in the equivalent outcrop formations: Meter-thick oolitic/peloidal shoal grainstones in the Middle Mahil (Sudair equivalent) and intraclastic-rich peritidal grainstones in the Upper Mahil (Jilh equivalent) present new potential targets for future exploration. The cyclic nature of vertical facies changes is well reflected in the outcrop weathering profile permitting sequence stratigraphic interpretations in a hierarchical manner. In order to capture lateral facies and thickness variations within the sequence stratigraphic framework, various wall panels and correlations were constructed on small (meters) and large scale (hundreds of meters/kilometers) and integrated into a 3D facies model.


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