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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Yose, L. A., A. S. Ruf, C. J. Strohmenger, J. S. Schuelke, A. Gombos, I. Al-Hosani, S. Al-Maskary, G. Bloch, Y. Al-Mehairi, and I. G. Johnson, reservoir
, Lower Cretaceous, Abu Dhabi (United Arab Emirates), in P. M. Harris and L. J. Weber, eds., Giant hydrocarbon reservoirs of the world: From rocks to
reservoir
characterization and modeling: AAPG Memoir 88/SEPM Special Publication, p.
DOI:10.1306/1215877M882562
2006 by The American Association of Petroleum Geologists.
Three-dimensional Characterization of a Heterogeneous Carbonate
Reservoir
, Lower Cretaceous, Abu Dhabi (United Arab Emirates)
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Lyndon A. Yose,1 Amy S. Ruf,2 Christian J. Strohmenger,3 Jim S. Schuelke,4 Andy Gombos,5 Ismail Al-Hosani,6 Shamsa Al-Maskary,7 Gerald Bloch,8 Yousuf Al-Mehairi,9 Imelda G. Johnson10
1ExxonMobil Qatar, Inc., Doha, Qatar
2ExxonMobil Upstream Research Company, Houston, Texas, U.S.A.
3Abu Dhabi Company for Onshore Oil Operations, Abu Dhabi, United Arab Emirates
4ExxonMobil Upstream Research Company, Houston, Texas, U.S.A.
5ExxonMobil Upstream Research Company, Houston, Texas, U.S.A.
6Abu Dhabi Company for Onshore Oil Operations, Abu Dhabi, United Arab Emirates
7Abu Dhabi Company for Onshore Oil Operations, Abu Dhabi, United Arab Emirates
8Abu Dhabi Company for Onshore Oil Operations, Abu Dhabi, United Arab Emirates
9Abu Dhabi Company for Onshore Oil Operations, Abu Dhabi, United Arab Emirates
10ExxonMobil Exploration Company, Houston, Texas, U.S.A.
ACKNOWLEDGMENTS
The authors thank the Abu Dhabi National Oil Company, the Abu Dhabi Company for Onshore Oil Operations, the ExxonMobil Exploration Company, and the ExxonMobil Upstream Research Company for supporting this collaborative study and for permission to publish these results. We also thank our colleagues for their contributions and valuable discussions, including Jim Anderson, Jim Markello, Peter Holterhoff, Imelda Johnson, Po Tai, Nat Stevens, Steve Bachtel, Brian Coffey, and Linda Corwin. The manuscript was improved by reviews from Jim Weber, Scott Tinker, Tony Simo, Sherry Becker, and Mike Kozar.
ABSTRACT
High-effort three-dimensional (3-D) seismic data collected by the Abu Dhabi Company for Onshore Oil Operations (ADCO) are some of the highest quality data ever collected for a carbonate field. The 3-D seismic data were integrated with core and log data to develop a new, volume-based framework for enhanced reservoir
characterization. The Lower Cretaceous (Aptian)
reservoir
is positioned over a platform-to-basin transition and records a diverse range of depositional facies and stratal geometries.
Reservoir
properties vary predictably based on position along the platform-to-basin profile and position in the sequence-stratigraphic framework.
The Aptian reservoir
interval (Shuaiba Formation) records a second-order sequence set that is divided into five depositional sequences. Sequences 1 and 2 were deposited during the transgressive phase of the sequence set. These sequences are retrogradational, record the initial formation of a low-relief ramp, and are dominated by algal-prone facies. Ramp interior and margin facies of the transgressive phase are characterized by high porosity and low permeability because of mud-dominated textures and development of microporosity. Sequence 3 was deposited during the highstand phase of the sequence set, is mainly aggradational, and records the proliferation or rudists across the platform top. Grain-dominated platform interior and margin facies of the highstand phase are the highest quality
reservoir
facies in the Shuaiba
reservoir
. Sequences 4 and 5 were deposited during the late highstand phase of the sequence set. These sequences are progradational and record the progressive downstepping of the platform margin onto a low-angle (1–2
) slope. Clinoforms of the late highstand phase are characterized by alternations of high and low
reservoir
quality developed in response to relative sea level changes. Sequence 6 was deposited during the second-order lowstand and forms the base of the next overlying sequence set. Sequence 6 is composed primarily of fine-grained siliciclastics and is a nonreservoir.
Results from the study have led to an improved understanding of platform evolution and a volume-based framework for reservoir
characterization. The integrated data set provides new insights on platform paleogeography, carbonate facies architecture, and the geometry and
mechanisms
of carbonate platform progradation. In the platform interior area, 3-D seismic data reveal a complex mosaic of tidal channels, high-energy rudist shoals, and intershoal ponds that impact
reservoir
sweep and conformance. At the basin margin, the seismic data provide high-definition images of platform-margin clinoforms that impact
reservoir
architecture and well-pair connectivity.
Business applications of the volume-based reservoir
framework include (1) use of 3-D seismic visualization technology for optimizing well placement, identifying bypassed reservoirs, and evaluating
reservoir
connectivity; (2) integration of quantitative, volume-based seismic information into
reservoir
models; (3) maximizing recovery through full integration of all subsurface data; and (4) enhanced communication among geoscientists and engineers, leading to improved
reservoir
management practices.
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