Source rock evaluation of patala Formation using wireline logs of Well Turkwal deep-01 upper Indus basin, Pakistan (P-1008) (MFN 6868)

Abstract

The purpose of this research is to evaluate source rock potential of Patala Formation using wireline log data of well Turkwal deep-01. Geographically the study area lies in Chakwal district. Tectonically, the study area is a part of Southern Potwar Deformed Zone Potwar. The data comprised of Log suit of all the three basic logs. To achieve the objective, qualitative and quantitative analyses have been done. A probable source zone has been marked from 10584ft-10596ft on the basis of log response. In this zone Gamma ray is showing relatively high response. Patala Formation is comprised mainly of shale with some portion of limestone as indicated by the cross-plot between bulk density and neutron. Mineralogically the Patala Formation contains heavy thorium bearing mineral as indicated by the cross plot of thorium and potassium. Uranium, Thorium and potassium are also relatively high in this zone which indicates that lithology is shaly carbonate that contains organic matter and having reducing environment. The maturation of source rock is defined by the trend of LLD. LLD is not showing higher value of resistivity which is another indication of Hydrocarbon in that Zone. The important factor of source rock is its total organic content (TOC). The TOC calculated by density log comes out to be 0.025%. Passey’s DlogR method is also applied for TOC calculation and it showed 0.07%. So the calculated value of TOC categorized Patala Formation acting as a poor source rock in the study area