Upper Burman Limestone Formation, early Miocene in age, that is made up of one single carbonate platform, the top of which corresponds to the gas reservoir of the Yadana Field.
Moderate dolomitization has affected the top and flanks of the platform during the depositional hiatus.
Data from seismics and four wells.
The high (28%) average porosity of the reservoir is dominantly related to strong development of microporosity, moldic and vuggy porosity.
Skeletal grains are dominated by non-geniculate coralline algae and large benthic foraminifers (Fig. 3A, B, C). Corals may be common in a few intervals (Fig. 3D). Non-geniculate coralline red algae are dominated by encrusting to branching forms, commonly forming nodules (rhodoliths) (Fig. 3A). The dominant genera are Lithothamnion, Mesophyllum and Sporolithon. Larger benthic foraminiferal association is characterized by Lepidocyclinids, Spiroclypeus, Cycloclypeus commonly displaying flat-shaped morphologies (Fig. 3C). Scleractinian assemblage includes robust branching or massive forms. Subordinate components include echninoderms, bryozoans, green algae and rare planktic foraminifera.