--> ABSTRACT: Integrated Reservoir Study and Modeling of the Shuaiba Reservoir, Bu Hasa Field, Abu Dhabi, UAE, by John C. Mitchell, Royal M. Hagerty, Chuck W. Calavan, Stephen R. Schutter, Steven M. Shapiro, Karen M. Love, Peter P. Mclaughlin, Khalid Al-Amari, Khalid Al-Serkal; #91020 (1995).

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Integrated Reservoir Study and Modeling of the Shuaiba Reservoir, Bu Hasa Field, Abu Dhabi, UAE

John C. Mitchell, Royal M. Hagerty, Chuck W. Calavan, Stephen R. Schutter, Steven M. Shapiro, Karen M. Love, Peter P. Mclaughlin, Khalid Al-Amari, Khalid Al-Serkal

The Shuaiba reservoir at Bu Hasa comprises carbonates of Lower Cretaceous (Aptian) age. Eustatic sea level fluctuations control stratal geometries, depositional facies, early diagenesis, and distribution of porosity and permeability. Integration of 2-D seismic, well log, core, petrographic, geochemical and production data led to development of a sequence stratigraphic framework, detailed reservoir zonation and 3-D geologic models of porosity, lithofacies and permeability.

The Shuaiba consists of portions of two second-order sequences; a progradational late highstand which comprises most of the reservoir, and a lowstand to transgressive interval which includes the Bab Member and transgressive carbonates in south Bu Hasa. Constituent higher order sequences control reservoir-scale heterogeneities.

Thick, aggradational, third-order transgressive and early highstand carbonates with flat-lying to sigmoidal geometries in south Bu Hasa thin to the north and become part of a mud-rich condensed section. North-dipping clinoforms in north Bu Hasa correspond to a third-order late highstand comprised of three progradational fourth-order shelf-margin complexes. Each consists of porous, grain-rich carbonates which thin rapidly downdip into mud-rich carbonates. Low porosity fourth-order transgressive carbonates onlap the shelf margins and serve as flow barriers. Extended exposure and meteoric diagenesis at the 112 Ma sequence boundary culminates the late highstand. The younger Bab onlaps the sequence boundary and is not in communication with the field.

Detailed log correlation based on the seismic and sequence stratigraphic framework zones the reservoir into 35 layers. The chronostratigraphic framework, well log and core data provided the template for 3-D computer geologic models of porosity, permeability and lithofacies throughout the field and into the Shuaiba aquifer.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995