Integrated Petrophysical Rock Typing Approaches for the Upper Surmeh Formation in an Oil Field in the Central Persian Gulf

Document Type : Research Paper

Authors

1 Department of Geology, Faculty of Sciences, University of Isfahan, Iran

2 Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Iran Iranian Offshore Oil Company (IOOC), Tehran, Iran

3 Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Iran

Abstract

The upper Jurassic Surmeh formation (Arab equivalent) is one of the most important oil reservoirs in the Persian Gulf. In this study, different rock typing approaches were used for the reservoir characterization of this formation in an oil field in the central Persian Gulf. Lithologically, the upper Surmeh formation is mainly composed of dolomite and anhydrite. Petrographic studies have led to the recognition of 10 microfacies grouped into four facies associations (belts) as supratidal, intertidal, lagoon, and shoal settings. The observed facies indicate a carbonate ramp as the depositional environment of the Surmeh formation. In order to relate the recognized microfacies with petrophysical rock classes, the porosity-permeability of cores was plotted on standard diagram and accordingly four distinct rock types (classes) were identified. In addition, electorofacies determination was applied by using the multi resolution graph-based clustering (MRGC) technique. The clustering technique has led to the recognition of six electorofacies in the upper Surmeh formation. Hydraulic flow units and reservoir/non-reservoir units were identified in the studied intervals by using the flow zone indicators (FZI) and a stratigraphic modified Lorenz plot (SMLP) respectively. Predicted porosity and permeability data were used to construct a continuous stratigraphic profile of reservoir/non reservoir units. Accordingly, six hydraulic flow units and nine reservoir units were identified and closely correlated in the studied wells. A comparison between the results of all rock-typing methods and petrographic data also reveals close correspondence. An integration of different rock typing approaches results in partitioning of three final rock types in the upper Surmeh formation.
 

Keywords

References

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Journal of Petroleum Research
Volume 25, Issue 84 - Serial Number 84
November and December 2015
Pages 72-87

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