The Late Cretaceous X Reservoir petrophysics properties and its Oil Geochemistry in the Nameless Oilfield, Mesopotamian Basin, South Iraq

The X Formation, which dates from the Late Cenomanian to early Turonian, is largest carbonate reservoir in Iraq's South Mesopotamian Basin. There are two shallowing-up depositional periods it, begin with deep water mudstone associated wackestone, gradually shallows into rudist and dominated by big foraminifera shoals barriers, followed lagoonal intertidal facies. identification of five distinct rock types, including mB2, mB1, CRII, mA, CRI, was based on a combination sediment types diagenetic processes that influenced porosity types. formation oil geochemical studies point Lower Cretaceous marine source environment mature anoxic.