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AAPG Bulletin


AAPG Bulletin, V. 83  (1999), No. 2 (February 1999), P. 230-243.

Lithological and Zonal Porosity-Previous HitPermeabilityNext Hit Distributions in the Arab-D Reservoir, Uthmaniyah Field, Saudi Arabia1

Salih Saner and Ali Sahin2

©Copyright 1999.  The American Association of Petroleum Geologists.  All Rights Reserved

1Manuscript received July 24, 1997; revised manuscript received June 8, 1998; final acceptance July 14, 1998.
2The Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia; e-mail: [email protected]; [email protected]

We acknowledge the support of Saudi Aramco for this work under KFUPM/RI Project No. 21059. We thank F. O. Meyer of Saudi Aramco, who read the manuscript and suggested improvements, and AAPG Bulletin reviewers N. Hurley, J. W. Smocker, and R. A. Clark, who offered constructive remarks. 


Previous HitPermeabilityNext Hit vs. porosity plots for the Arab-D carbonate reservoir show a relatively poor correlation, so Previous HitpermeabilityNext Hit estimation still remains an issue for discussion. In this study, we integrated basic core measurements with stratigraphic and petrographic analyses to determine porosity and Previous HitpermeabilityNext Hit distributions and to identify the association of high Previous HitpermeabilityNext Hit, in Darcy range, with lithology and defined reservoir zones.

Carbonate rock types in the Arab-D reservoir have been grouped into three lithofacies: granular, muddy-granular, and muddy. The granular lithofacies is the most porous and permeable, and all Previous HitpermeabilityNext Hit measurements in Darcy range are associated with it. The muddy facies is represented by low porosity and Previous HitpermeabilityNext Hit values. Porosity and Previous HitpermeabilityNext Hit distributions of the muddy-granular facies spread over the two regions representative of the muddy and the granular facies.

Porosity and Previous HitpermeabilityNext Hit distribution patterns of the Arab-D zones are controlled by both type and the arrangement of different lithologies. Zones made up of granular facies demonstrate uniformly high porosity and Previous HitpermeabilityNext Hit distributions and reveal the highest Previous HitpermeabilityNext Hit intervals. Zones represented by muddy-granular and muddy facies indicate more heterogeneous and mostly bimodal porosity and Previous HitpermeabilityTop distributions. 

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