--> Abstract: Jurassic Fractured Carbonate Reservoir Characterization Overview - Northern Kuwait, by Sunil K. Singh, William J. Clark, Mishari Al-Awadi, Meshal Al-Wadi, Gary S. Forrest, Yuan Z. Ma, Ernest Gomez, Michael F. Doe, Paul R. LaPointe, Oki T. Musakti, and Salah El Shazly; #90072 (2007)

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Jurassic Fractured Carbonate Reservoir Characterization Overview - Northern Kuwait

Sunil K. Singh1, William J. Clark2, Mishari Al-Awadi1, Meshal Al-Wadi3, Gary S. Forrest4, et al.
1Kuwait Oil Company, Ahmadi, Kuwait
2Schlumberger Data and Consulting Services, Greenwood Village, CO
3Kuwait Oil Co, Ahmadi, Kuwait
4Schlumberger DCS, Greenwood Village, CO

The Jurassic reservoir section of northern Kuwait consists of over 2000 feet (610m) of carbonates and lesser evaporites and kerogen-rich source rocks deposited in a ramp environment. The study area encompasses approximately 1400 square kilometers, is covered by 3D seismic surveys, and includes 14 wells drilled on multiple structures. Reservoirs consist of low porosity and permeability NE-SW aligned grainstone shoal complexes, subordinate high porosity and permeability sucrosic dolomites, and fracture networks. Sedimentology and petrography were established with over 2500 feet (750m) of core and several hundred thin sections. Sequence stratigraphy was defined using sequence boundaries and major flooding surfaces observed in cores and from well log signatures. Fractures were observed in cores and on image logs, and seismic data was used to model major and secondary faults. The tectonic history of the area has included regional deformation from Zagros thrusting and local salt movement.
Modeling of the reservoir complex was accomplished by establishing layers and sub-layers within the sequence stratigraphic framework and then defining lithofacies by integrating core and petrophysical facies. Geostatistical methods based on analogs from modern and ancient ooid shoal complexes were used to model and distribute these lithofacies. The log-derived average porosities were then modeled based on the lithofacies models for each layer, and permeability distributed based on a transform. The fracture facies were delineated from core and image logs, and extended laterally through a combination of stratigraphy, matrix properties, curvature and seismic attributes. The integrated property/fracture model is being used for simulation and field development.

 

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