--> Abstract: Minimizing Exploration Risks through Integrated Reservoir Characterizations of Miocene Carbonate Buildups of Central Luconia Province, Offshore Sarawak, Malaysia, by Kob Che, Mohd Razali, Mohamad Yamin Ali, Asiah Mohd Salih, Mohd Fauzi Abdul Kadir, and Rosmah Rahman; #90072 (2007)

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Minimizing Exploration Risks through Integrated Reservoir Characterizations of Miocene Carbonate Buildups of Central Luconia Province, Offshore Sarawak, Malaysia

Kob Che, Mohd Razali, Mohamad Yamin Ali, Asiah Mohd Salih, Mohd Fauzi Abdul Kadir, and Rosmah Rahman
PETRONAS Group Research, Selangor, Malaysia

The Miocene carbonate reservoirs of the Central Luconia Province, offshore Sarawak, Malaysia have been an important exploration target since the 1970's. They contain a larger portion of gas reserves in Malaysia. To date, more than 200 of the carbonate build-ups have been mapped and 45 fields have been discovered and tested. However, the interest to explore and develop these reservoirs has declined due to high exploration risks associated with complex heterogeneity of the carbonate reservoirs. The main risk is the uncertainties related to reservoir definition and characterization.
The recent discovery of a 640 m of gas column with low CO2 and H2S concentrations, under a normal pressure condition, and the absence of thief sands has sparked the interest for exploring the remaining build-ups. However, many aspects of carbonate reservoir characterizations remain uncertain.
An integrated approach, consisting of core study, well-log analysis and 3D seismic interpretation, has been conducted to formulate a better technique in characterizing the carbonate reservoirs in the area. A detailed lithofacies description and petrographic study was carried out on 750 m of core from 3 exploration wells to determine facies constituents, interpret depositional environments and diagenesis, and identify significant chronostratigraphic surfaces. The Integration of well-log correlation using the climate stratigraphy approach Enres's Cyclolog software and 3D seismic interpretation has yielded a significant and consistent high resolution stratigraphic correlation that could be used as a framework for correlating the reservoir horizons which was impossible in the past.
This approach provides a better definition and characterization of the carbonate reservoirs in the area and contributes significantly towards minimizing the exploration and development risks of the carbonate reservoirs.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece