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Permeability variation modeling and reservoir heterogeneity of Bangestan carbonate sequence, Mansouri oilfield, SW Iran

  • B. Soleimani
  • M. Moradi
  • A. Ghabeishavi
  • A. Mousavi
Original Article
  • 22 Downloads

Abstract

Reservoir permeability and other property variations were investigated in all nine zones of the Bangestan carbonate sequence in the Mansouri oil field located in the southwestern of Iran. The prepared permeability distribution models using RMS method indicated that there are two abnormal high-permeability zones located at the northwestern in Zone 2 and southeastern in Zone 6 of the reservoir. Core data analysis and petrographic thin-section study, electrofacies model, and fluid saturation measurements were used to verify the results of permeability models. Petrographically, the main constituents of the Bangestan carbonate sequence were wackestone and packstone facies. Based on five determined microfacies confirmed the environmental instability from open marine to semi-restricted lagoonal environments while understudied carbonate deposition. Diagenetic processes such as solution (pressure and chemical), dolomitization, and fracturing improved the reservoir quality. Electrofacies (EF) model was also done by gamma ray (GR), water saturation (Sw), acoustic log (DT), neutron porosity, and effective porosity (PHIE) data. Four EFs were determined and reservoir quality was decreased from EF-1 to EF-4. The results showed that the vuggy porosity abundances and electrofacies distribution, as the main controllers of the reservoir quality, are well coincident with the permeability model. The vuggy porosity type was found to be as a fabric selective pore and an individual character of rudist-rich zones. Fluid saturation data are consistent with the permeability model and related high reservoir quality and production zones. The detected anomalies of permeability in the model can be interpreted by three scenarios: (1) basement faults activities, (2) sedimentary environment changes, and (3) combinational effects of faults and sedimentary deposition. It is believed that the third scenario is more logic.

Keywords

Bangestan reservoir Mansouri oil field Modeling Permeability Electrofacies 

Notes

Acknowledgements

The authors would like to acknowledge the support and advice of colleagues at National Iranian Oil Company (NIOC), NIDC, Geological development section, and the Research Manager of Shahid Chamran University of Ahvaz for their encouragements. We would also like to express our sincere thanks to anonymous referees for their critical points to improve the quality of the paper.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • B. Soleimani
    • 1
  • M. Moradi
    • 1
    • 2
  • A. Ghabeishavi
    • 3
  • A. Mousavi
    • 3
  1. 1.Geology Dept., Earth Sciences FacultyShahid Chamran University of AhvazAhvazIran
  2. 2.Well Logging OperationNational Iranian Drilling CompanyAhvazIran
  3. 3.Department of Developing GeologyNational Iranian Oil CompanyAhvazIran

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