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Marine Science Centre, University of Basrah, Basrah, Iraq and Department of Geolog),, College of Science, University oi Baghdad, Iraq

ABSTRACT

Detailed petrographic analysis has been carried out on samples of the Rumaila Formation

and equivalents in sixteen selected boreholes in the Mesopotamian Basin. Four distinctive

carbonate depositional microfacies are identified, namely: lime mudstone, fossiliferous lime mudstone, lime wackestone, and lime packstone. The most common microfacies (i.e. fossiliferous lime mudstone and lime wackestone) are differentiated objectively by the application of the cluster analysis technique. Distance and product-moment similarity coeflicients were used. A facies triangle and ratio map were constructed for each coefficient.