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The lower Aptian Shuaiba carbonate outcrops in Jebel Akhdar, northern Oman; impact on static modeling for Shuaiba petroleum reservoirs

Jean Borgomano, Jean-Pierre Masse and S. Al Maskiry
The lower Aptian Shuaiba carbonate outcrops in Jebel Akhdar, northern Oman; impact on static modeling for Shuaiba petroleum reservoirs
AAPG Bulletin (September 2002) 86 (9): 1513-1529

Abstract

Outcrops in the Jebel Akhdar (north Oman Mountains) offer a unique opportunity to study the depositional architecture of the lower Aptian Shuaiba carbonate that is the main hydrocarbon-producing interval in north Oman. This carbonate formation belongs to an early Aptian platform complex that can be divided into inner-and outer-shelf domains with a sharp transition to the basinal environment toward the north. Detailed outcrop studies were carried out to establish a stratigraphic data set that could be used as an analog for reservoir characterization in the subsurface. High-resolution stratigraphic correlations between as closely spaced as possible sections allow two-dimensional (2-D) geometry of sedimentary bodies to be interpreted within a sequence-stratigraphic framework. The environment restriction and the situation relative to the shelf margin have the greatest impact on the development and geometry of the facies. Inner-shelf rudist beds have a variable thickness (1-10 m) and are laterally continuous (10-45 km). They can be locally interbedded with thin (<2 m) grainstone beds characterized by lateral dimensions comprised between 5 and 35 km. Outer-shelf rudist and grainstone units are characterized by variable lateral continuity (1-12 km) and thickness (1-15 m) and can be very thick toward the shelf edge (<20 m). For a given facies, overall body thickness is 40% thinner in the inner shelf, whereas body length is 30% shorter in the outer shelf. Interpreted stratigraphic systems tracts, transgressive and regressive, also are characterized by specific facies developments in combination with the paleogeographic situation. Descriptive statistics of the stratigraphic data set are provided. Such basic numerical data can support static modeling of Shuaiba reservoirs in north Oman's main oil fields in relation to the paleogeographic setting and the stratigraphic systems tracts.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 86
Serial Issue: 9
Title: The lower Aptian Shuaiba carbonate outcrops in Jebel Akhdar, northern Oman; impact on static modeling for Shuaiba petroleum reservoirs
Affiliation: Shell International EP Technology Applications and Research, Rijswijk, Netherlands
Pages: 1513-1529
Published: 200209
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 21
Accession Number: 2002-071527
Categories: Economic geology, geology of energy sourcesStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diag., sects., sketch maps
N23°00'00" - N24°10'00", E57°15'00" - E58°00'00"
Secondary Affiliation: University of Provence, FRA, FranceShuram Company, OMN, Oman
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 200222
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