Integrated Rock Typing of the Grainstone Facies in a Sequence Framework: a Case from the Jurassic Arab Formation in the Persian Gulf
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Integrated Rock Typing of the Grainstone Facies in a Sequence Framework: a Case from the Jurassic Arab Formation in the Persian Gulf
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We thank the University of Tehran for providing facilities for this research. The authors acknowledge the Research Institute of Petroleum Industry (RIPI), Tehran, for sponsorship and data preparation. We greatly appreciate precise reviews by anonymous reviewers whose comments improved the quality of the manuscript.

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    The late Jurassic Arab Formation, a significant carbonate-evaporite reservoir rock in the Persian Gulf, is characterized by frequent grainstone facies. For rock type identification and reservoir characterization, core description, petrographic studies and pore system evaluation are integrated for Balal oil field in the Persian Gulf. The grainstone facies are developed into three shoal subenvironments on a carbonate ramp platform: leeward, central and seaward. Compaction, dissolution, cementation, anhydrite mineralization and dolomitization are the main diagenetic processes affecting the depositional pore system. Considering depositional and diagenetic features and pore types, the grainstones are classified into six rock types (RT 1 to RT6). Rock types 1, 2 and 5 have large pore throat sizes with inter-granular and touching vug pore types. In rock type 3, moldic pores lead to high porosity and low permeability. Rock types 4 and 6 are cemented by anhydrite, calcite and dolomite. Generally, RTs 1, 2, 3 and 5 are related to late Transgressive systems tract (TST) and early Highstand systems tracts (HST) and show fair to good reservoir quality. In contrast, RTs 4 and 6 of late HST system tract show lower poroperm values, due to evaporite mineralization. Characterization of the grainstone facies provides a comprehensive understanding of the reservoir zones of the Arab Formation.

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Ali ASSADI, Hossain RAHIMPOUR-BONAB, Rahim KADKHODAIE-ILKHCHI.2018. Integrated Rock Typing of the Grainstone Facies in a Sequence Framework: a Case from the Jurassic Arab Formation in the Persian Gulf[J]. ACTA GEOLOGICA SINICA(English edition),92(4):1432~1450

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  • 最后修改日期:2018-02-27
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  • 在线发布日期: 2018-08-21
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