《Table 1 The identified grainstone facies in association with their sedimentary characteristics and

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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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（a:frequent，c:common，r:rare）

The integration of the results from core description and petrographical studies has led to the identification of six main grainstone facies named here GF-1 to GF-6（Fig.4）.The frequency analyses indicate that Bioclast grainstone（GF-6）and Ooid/peloid grainstone（GF-3）are the most frequent facies in the four studied wells.The sedimentary characteristics of the grainstone facies of the Arab Formation are shown in Table 1.Shoal bodies can be subdivided into three parts based on allochemical and textural properties including leeward，central，and seaward（Fig.5）.In the leeward shoal，the skeletal components are mainly gastropods，green algae and benthic foraminifera，and the main non-skeletal grains are peloids.In contrast，grainstone facies related to the central shoal are characterized by the frequency of non-skeletal grains，especially ooids and peloids.Echinoderms，coral，green algae，brachiopods，and benthic foraminifera are the most important skeletal components of the grainstones in the seaward shoal.In these facies，non-skeletal grains predominantly include peloids and intraclasts.