Source rock evaluation of datta formation using wireline logs of well Chanda-02 upper Indus basin, Pakistan (P-0995) (MFN 6319)

Abstract

This research work is carried out to delineate source rock potential of Datta Formation using wireline log data of well Chanda-02. The study area is located in Kohat district. Geologically, the study area is a part of Kohat sub-Basin of Upper Indus Basin. Log data utilized to conduct this research work includes Gamma ray log, Spectral Gamma ray log, Density log, Resistivity log and Sonic log. The research work indicates that Datta Formation has a good source rock potential, this quantitative research for the calculation of TOC includes two methods: (i) using Density log (ii) Passey’s DlogR method. Two source rock zones are marked on the basis of shaly content with high SGR values and with a positive anomaly of uranium were subjected to the quantitative analysis. For both the zones the estimated values of TOC’s are 1.11% and 1.17% respectively which we can say Datta Formation is a probable source rock. Lithologically, Datta Formation is comprised mainly of sandstone with intercalations of shale beds as indicated by the two cross-plots including bulk density vs neutron porosity and sonic vs neutron porosity respectively for the identification of lithology. Mineralogically the Datta Formation contains heavy thorium bearing minerals as indicated by the cross plot of thorium and potassium. The vitrinite reflectance proves Datta Formation to be a mature source rock, capable of producing hydrocarbons.