SOURCE ROCK EVALUATION OF NAMMAL FORMATION, POTWAR SUB-BASIN, PAKISTAN

Abstract

The present study investigated the source rock potential of Nammal Formation in Dakhni Southwest-01, and Jand-2 wells. The study wells are located in Jand area in Attock district. Tectonically, the wells are located in Potwar sub-basin near Dakhni anticline. The tectonic regime of the area is highly stressed and contains faults, anticlines and various structures. To achieve the objectives of this research, the methodology adopted is to carry out various analyses on the rock cuttings of Nammal Formation. In Dakhni Southwest-01, the organic richness was determined using Leco CS-300 and maturity data was achieved by using ROCK EVAL-6 instruments. The TOC values range between 1.73-3.73% indicating good to very good quality. The values of S1 range between 0.15-1.59 mg HC/g rock and values of S2 lie in the range between 0.72-3.87 mg HC/g rock indicating poor to good and poor to fair quality respectively. For Jand-2, the organic richness and maturity data was achieved by using ROCK EVAL-6 instruments. The TOC values range between 0.19-1.52% indicating poor to good quality. The values of S1 range between 0.75-7.52 mg HC/g rock and values of S2 lie in the range between 0.39-2.38 mg HC/g rock indicating poor to fair quality respectively. Van Krevlen diagram and S2 vs. TOC plots elucidate that the Nammal Formation contains type III kerogen and has the potential to produce gas only.