Karst impact on Cenomanian – Turonian M carbonates is one of the most challenging aspect related to geologic modelling in the Southern Iraq.

This diagenetic process that encompasses the uppermost 20 to 40 m of the reservoir and enhances reservoir connectivity and permeability, is documented by secondary porosity features like vugs and small solution enlarged fractures related to an emersion period of the carbonate ramp (Late Cenomanian to Turonian).

Karst permeability was recognized at well scale and zones of permeability enhancement were assessed within the upper M sequence integrating all the available static and dynamic data.

The present workflow guarantees an appropriate reconstruction of the internal reservoir and fluid path architecture, resulting in a predictive tool for field development planning.


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