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King Abdulaziz University (2012)

FORMATION EVALUATION AND 3D GEOLOGICAL MODEL OF AL ISHARA SOUTH OIL FIELD IN THE EUPHRATES GRABEN, SYRIA

Babbo, Ihab Yahia

Titre : FORMATION EVALUATION AND 3D GEOLOGICAL MODEL OF AL ISHARA SOUTH OIL FIELD IN THE EUPHRATES GRABEN, SYRIA

تقييم المتكون الصخري وبناء نموذج جيولوجي ثلاثي البعد لحقل بترول جنوب العشارة بمنخفض الفرات – سوريا

Auteur : Babbo, Ihab Yahia

Université de soutenance : King Abdulaziz University

Grade : Master Thesis 2012

Résumé
The Euphrates Graben in southeastern part of Syria is considered to be one of the most important Mesozoic basins where oil deposits remain to be discovered and developed. In February 1986, the discovery well, Al Ishara-East101 Well, located in what is now the Al Ishara East Oil Field close to the central part of the Euphrates Graben, produced oil at high flow rates. In 1989, the field has produced at rates of up to 10.400 bbl/d. In the southern part of this field, another discovery well, Al Ishara-South1 Well, was drilled in 2009 by the Syrian Petroleum Company and produced oil of 370 API gravity oil. Three wells, each situated in a horst fault block, define Al Ishara South Oil Field. The Al Ishara South Oil Field lies at the crest of a tilted fault block, bounded on the east by a main normal fault and on the north by EW-trending graben. The field is a structural trap formed by tilting and erosion of a major fault block. In this field of the Euphrates Graben, the crude oils were derived primarily from Rutbah Formation of Lower Cretaceous age. The reservoir is mainly sandstones that are interpreted as having been deposited in upper shoreface, lower shoreface, offshore transition zone and outer shelf environments. Hydrocarbons are trapped in a tilted fault block capped by marl and marly limestone of Upper Cretaceous age. The reservoir is truncated by the Base Upper Cretaceous Unconformity and overlain by Muloussa-F Formation of Upper Triassic age. The Tanf Formation of Silurian age constitute the major source rock. Commercially available software packages that are used to interpret well logs and produce geological models are becoming very important in oil and gas industry. This study focuses on the interpretation of well log data in sequence stratigraphic terms and the evaluation of hydrocarbons in the porous zones encountered in the Upper Triassic to Upper Cretaceous reservoirs, penetrated by the three wells scattered in the study area. Detailed 3D geological modeling of the petroleum reservoirs conducted through this integrated study. It demonstrates the importance of integrated sedimentological analysis with well log interpretation and static modeling so as to enhance the predictive capabilities of subsurface models. Also, an improved understanding of basin-specific seal integrity is obtained from application of the fault seal evaluation techniques on this field. The results of this study were used for recommendations for further exploration and development planning in this area.

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Page publiée le 25 novembre 2013, mise à jour le 5 décembre 2017