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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Sylvester, Kevin, Dave Waldren, Bakhtiyar Bagirov, and Elshad Alaskarov,
DOI:10.1306/13291388M953448
2012 by The American Association of Petroleum Geologists.
Balakhany IX and X Integrated Studies Shallow-Water Gunashli Field, Caspian Sea
Kevin Sylvester,1 Dave Waldren,2 Bakhtiyar Bagirov,3 Elshad Alaskarov4
1BP/Azerbaijan International Operating Company (AIOC)-Petroleum Consulting and Training (PCT) Ltd., Cobham, Surrey, United Kingdom
2BP/Azerbaijan International Operating Company (AIOC)-Petroleum Consulting and Training (PCT) Ltd., Cobham, Surrey, United Kingdom
3State Oil Company of Azerbaijan (SOCAR) Reservoir Modeling Centre (RMC), Baku, Azerbaijan
4State Oil Company of Azerbaijan (SOCAR) Reservoir Modeling Centre (RMC), Baku, Azerbaijan
ACKNOWLEDGMENTS
We thank the State Oil Company of the Azerbaijan Republic (SOCAR) and the shareholders of the Azerbaijan International Operating Company (AIOC) for permission to publish this chapter. Our thanks also go to colleagues in the SOCAR Reservoir Modeling Centre and BP, who contributed to this integrated study.
ABSTRACT
The Azeri, Chirag, and Gunashli (ACG) fields, located offshore Baku in the Caspian Sea, are being developed under a 30 yr Production Sharing Agreement. Contiguous with the ACG accumulation, the shallow-water Gunashli (SWG) field has produced in excess of 800 MMSTB since 1980 from more than 220 wells.
SWG provides an opportunity to study the static and dynamic behavior of reservoirs important to the development of ACG.
BP, operator of ACG, contracted with the Reservoir Modeling Centre of the State Oil Company of Azerbaijan to perform a study of the Balakhany IX and Balakhany X reservoirs in the SWG development.
This study comprised construction of geologic descriptions for both reservoirs and their use in dynamic simulation models. This was achieved using hand-contoured geologic mapping, incorporating depositional trends such as channel architecture. Matching historical per formance data from these reservoirs verified the underlying geologic models and provided confidence in predictions derived from them.
Results of this study show that channel width was the key to accurate estimation of stock tank oil initially in place, and that to achieve this, as many wells as possible must be incorporated.
In addition, vertical communication between sublayers of the reservoir was defined using geologically derived maps
referred to as
interface transmissibility.
Thus, a set of deterministic
maps
based on well data provided an approximate three-dimensional (3-D) representation of the Balakhany IX and Balakhany X stacked channel architecture.
This work will assist in the planning and optimization for the development of the ACG field.
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