Sedimentology, Sequence Stratigraphy and Reservoir Characterization of Samana Suk Formation Exposed in Namal Gorge Section, Salt Range, Mianwali, Punjab, Pakistan

摘要

Samana Suk Formation of Bathonian-callovain age, exposed in Nammal Gorge Salt Range, has been studiedfor microfacies and sequence stratigraphic investigation. The formation is mainly composed of limestone, with minorbeds of sandstone and marl. The limestone is grey, yellowish and purple in color. Limestone is fine grained, thin tomedium bedded and inter-bedded with algal laminations. The sandstone is light yellowish brown, brick red in color,calcareous and quartzose. Within Samana Suk Formation one 2ndorder sequence and two 3rdorder sequences have beenidentified. Their regional correlation through fine-tuned dating helped to develop basin fill model and to understandfacies dynamics. A facie belt comprising a wide belt of carbonate facies characterized by Peloidal Packstonemicrofacies represents inner ramp setting and Pelletal/ Peloidal Wackstone, Mud-Wackstone and Mudstone microfaciesrepresent the low energy lagoonal environment. The sandstone lithofacies represents high energy beach environmentwhich indicates aggrading to pro-grading pattern. The porosity analysis has been done on different samples oflimestone and sandstone. For the porosity analysis the Image J software is used. In limestone the porosity ranges up to6% while in sandstone the porosity ranging up to 18%. From the field and porosity analysis it is concluded that SamanaSuk Formation in study area is good reservoir.