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Facies and palynofacies characteristics of the Upper Jurassic Arab D reservoir in Qatar

The oil producer Arab “D” unit in Qatar as well as in eastern Arabian Peninsula is composed of limestone and dolomitic limestone assigned to the Kimmeridgian age. In Qatar, this member reveals the presence of six rhythmic microfacies of mudstone (micrite), wackestone, dolomitic wackestone, packstone, grainstone and anhydrite. These sediments are believed to be deposited in numerous short-term transgressive-regressive cycles, but generally the Arab D member represents a regressive cycle. The grainstone facies in the middle part of the unit is rich in benthic foraminifera belonging to Kurnubia and Pfenderina. Palynological analysis yielded ecologically and biostratigraphically significant dinoflagellate cyst species such as Cribroperidinium globatum, C. longicorne, Dichadogonyaulax chondra, D. pannea, Epiploshaera bireticulata, Geochteodinia antennata, Systematophora areolata and S. penicillata, giving evidence for a late Kimmeridgian age of the Arab D member. Amorphous organic matter is the dominant element of the particulate organic matter. The Arab D member may have been deposited in shallow water of the middle shelf depth (30-50 m) under arid to semiarid climatic conditions as deduced from the presence of Classopollis pollen and the capping anhydrite.