Petrography and Petrogenesis of Basal Laki and Ranikot Sediments from PMDC’s Lakhra Wens PS-1 and PS-13

Abstract

    Petrographic analysis was carried out on 22 core samples from depth interval 30 to 70metres from Pakistan Mineral Development Corporation’s (PMDC) Lakhra PS-l and PS-13 wells, drilled to find out lithologic entity and depositional framework of hod ions ofthe Basal Laki (E. Eocene) and Ranikot (Paleocene) sediments. Granulometric analysis, thin section study, bituminosity and calcimetry reveal that the rocks in the interval, consist of shallow marine, high to low energy sediments with some lagoonal influence and fresh water phareatic interfingering. Basinal mud also came in during rise in sea level.
Sand-shale and lime-mud sediments form the lithologic units from bottom to top. Bioturbation and gravity now in sediments are prominent. Siliciclastic carbonate facies is found to be dominant.