SEQUENCE STRATIGRAPHIC FRAMEWORK OF PERMIAN TO EOCENE AGES IN GUJAR KHAN AREA, POTWAR SUB-BASIN, PAKISTAN

Abstract

Sequence stratigraphic interpretation was carried out in Gujar Khan Area of Potwar sub basin, Upper Indus basin Pakistan. To accomplish this task well log data (Balkassar Oxy-01,Daiwal-01,Kal-01,Rajian-01 and Missa Keswal-01) especially Gamma Ray Log (GR log) along spontaneous potential log (SP log) and sonic log (DT) were used and depositional system tracts such as Low Stand System Tract (LST),Transgressive System tracts (TST), High Stand System Tract (HST) and Sequence boundaries such as Type 1 (SB1) and Type 2 (SB2) have been identified. Four Type 1 Sequence Boundaries (SB1) and one Type 2 Sequence Boundary (SB2) from Early Permian to Top Eocene have been identified. In early Permian LST has been identified in Tobra Formation and Early HST have been identified in Dandot Formation, LST is designated for Warchha Sandstone and TST has been identified in Sardhai Formation. In Paleocene age, LST and TST have been identified in Hangu Formation, TST has been identified in Lockhart and HST has been identified in Patala. In Eocene age, SMST has been suggested for Nammal Formation, Early HST for Sakessar Limestone and Late HST has been suggested for Chorgali Formation. Although quality of data was not much reliable yet depositional tracts and stratigraphic features have been identified on seismic data, well log correlation model that has been validated through literature review combined with it to form finalized seismic stratigraphic model of Gujar Khan (study area) has also been developed.