Abstract:
This research is focused on the petrographic investigation of the Cretaceous
Kawagarh Formation exposed in Garhi Habibullah section of Hazara Basin. The
Formation is composed of thick to medium bedded, hard, highly fractured, argillaceous
and marly limestone with steep dip angles. A total of 17 representative samples were
collected at regular interval of 5meters for petrography. In petrography, a large number of
fossils of planktonic foraminifera, radiolarians, bioclasts, sparite, micrite and matrix were
identified. On the basis of these features four microfacies including planktonic
foraminiferal wackestone, planktonic foraminiferal mudstone, bioclastic mudstone and
radiolarian bioclastic wackestone were established. The environment of deposition for the
formation is concluded as outer ramp to deep basins. The biozone in this study for the
Kawagarh Formation is globutruncana ventricosa biozone revealing the age of the
formation as early to middle Campanian. The recorded diagenetic processes include
cementation, pyritization, micritization, fracturing, pressure dissolution and neomorphism
are common in the rock unit. These diagenetic features impart vuggy porosity to the
formation, but the reservoir potential of the Kawagarh Formation is relatively poor due to
diagenetic episodes. Thus, the Kawagarh Formation, Garhi Habibullah section, is an early
to middle Campanian age with poor reservoir properties.
