Abstract

The hydrocarbon source rock potential of three formations encountered in Bijnot well, in Punjab platform was investigated using TOC and Rock-Eval pyrolysis measurements. Analysis was performed on sixteen well and core cutting samples of Shinwari, Datta and Khewra formations. Shinwari Formation consists of three distinct units, namely the upper (marl and limestone) middle (sandstone and clay) and lower (limestone and shale). Shinwari Formation have fair TOC 0.54-0.62 wt.%, as indicated by HI vs Tmax plot and lies in mature zone with kerogen Type III. The Datta Formation consists of sandstone and claystone lies in mature zone and having fair TOC 0.60-1.09 wt.%. Genetic potential is insignificant 0.67-1.05mg HC/g rock, low HI values falls in Type III kerogen. The Khewra Formation consists of sandstone with thin claystone beds and have a good TOC 0.80-1.38 wt% at 1630-1641m depth, and fair TOC 0.57wt% at 1710m depth. The HI vs OI and HI vs Tmax plots indicate Type III and mix Type II-III kerogen, having Tmax 441-448 °C and lies. Oil and gas prone mature zone. Based on analysis performed the Khewra Sandstone Formation sediments have poor generative potential.

Keywords: Punjab platform; Bijnot; Geochemical; Rock-Eval; Tmax