The carbonate microfacies identified belong to the standard microfacie types 9 and 10 of Flugel 1972, Turcker and Wright 1990: which are bioclastic wackestone/bioclastic micrite and packstone-wackestone respectively.

The textures and structures preserved in the carbonate rock revealed that early diagenetic processes have taken place which has affected the reservoir quality of the carbonate rocks.

Presence of both benthic foraminifera and ostracod with absence of planktonic foraminifera.

The microfacies present and benthic foraminifera are indicative of shallow water marine environment.

The Illela borehole is delineated into upper foraminifera and lower ostracod biostratigraphic units.