Abstract
The detailed petrological investigation of Samana Suk Formation from Hazara Basin, Pakistan was carried out to elaborate its microfacies. The Samana Suk Formation is mostly composed of fine to coarse-grained, limestone with dolomite in parts developed as a secondary diagenetic fabric. Twenty-five samples were studied from Thandiani Section, and five microfacies with seven sub microfacies were identified. The identified microfacies include Peloidal Foraminiferal Mudstone, Ooidal Peloidal Mudstone, Bioclastic Planktonic Mudstone as Submicrofacies, Peloidal Wackstone, Ooidal Wackstone, Intraclastic Wackstone as Sub Microfacies, Peloidal-Packstone Microfacies, Ooidal Mud-Wack Microfacies and Peloidal-Ooidal Wack-Pack Submicrofacies. Diagenetic features, such as Stylolites, Calcite Veins, Fractures, Dolomitization, Cementation, Compaction and Micritization have been observed in the petrographic study of the samples. The environment of deposition as depicted from the microfacies is Outer ramp for Mudstone, Peloidal Foraminiferal Mudstone, Ooidal to Peloidal Mudstone and Bioclastic Mudstone; Middle ramp for Peloidal Wackstone; Inner ramp for Ooidal Wackstone, Intraclastic Wackstone Peloidal Packstone and Peloidal-Ooidal Wack-Packstone; Inner-Middle ramp for Ooidal-Mud-Wackstone. Based on the microfacies analysis the Samana Suk Formation was interpreted to be deposited in a shallow shelf environment.
Highlights
The selected Thandiani section of the Samana Suk Formation is located along Abbottabad-Thandiani Road, eastern Hazara, north Pakistan, geographic coordinates are
Eastern Hazara is a part of Hazara Basin in lesser Himalayas and represents a region with a well-developed stratigraphic succession and deformed structural features
Samana Suk Formation is the well-developed package of carbonate rocks present in the Upper Indus Basin Pakistan
Summary
The selected Thandiani section of the Samana Suk Formation is located along Abbottabad-Thandiani Road, eastern Hazara, north Pakistan, geographic coordinates are (lat 34.227835N: long 73.33589E). Eastern Hazara is a part of Hazara Basin in lesser Himalayas and represents a region with a well-developed stratigraphic succession and deformed structural features. The rocks exposed in the area range from Precambrian to Mesozoic and Tertiary successions. Carbonate rocks have a huge importance in hydrocarbon exploration for its potential as a good reservoir and source rock properties and to understand and identify a good reservoir sedimentology plays a very crucial role. Samana Suk Formation in other part of Pakistan are been studied for its reservoir potential. Due to intense tectonic activities and resulted deformation in the lesser Himalayas most of the carbonate rocks have lost their hydrocarbon potential and studied only for their stratigraphic or paleontological importance for academic importance
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