Hydrocarbon Source Rock Potential of the Late Paleocene Patala Formation, Kohat Basin, Pakistan

Iranian Journal of Earth Sciences

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 30 خرداد 1402

نوع مقاله: Original Research Paper

شناسه دیجیتال (DOI): 10.57647/j.ijes.2024.1602.07

نویسندگان

Tausif Javed^{1، 2}؛ Syed Mamoon Siyar^{* 1، 3}؛ Syed Muhammad Wasim Sajjad^{1، 4}؛ Fayaz Ali³؛ Fawad Raziq¹؛ Saeed Ullah¹؛ Nasar Khan¹؛ Izaz Ali¹

¹Department of Geology, University of Malakand, Chakdara, Dir (Lower), Pakistan

²Department of Earth Science, Quaid-e-Azam University Islamabad, 45320, Pakistan

³Department of Geology, University of Peshawar, Pakistan

⁴Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Italy

چکیده

The Late Paleocene Patala Formation in other parts of the Upper Indus Basin has good source rock potential. In order to evaluate the hydrocarbon potentiality of the Patala Formation shales exposed at Tarkhobi Nala, Kohat Basin, Pakistan geochemical studies were conducted. Nine shale samples from the studied formation were analyzed for TOC and Rock-Eval pyrolysis. The TOC results were low, ranging from 0.36 wt. % to 1.25 wt. %, indicating overall poor to good hydrocarbon potential.The generating potential values (< 2 mg HC/ g. rock) show poor ability for hydrocarbon production. Cross plots of Rock-Eval pyrolysis parameters (HI vs OI; HI vs Tmax; S2 vs TOC) were used to describe the types of kerogen and thermal maturity of the analyzed samples. This study confirms the presence of type IV kerogen, which has no capability to generate hydrocarbons except minor gas upon thermal maturation. The thermal maturity of the organic matter was assessed by Tmax (444 ֯C to 459 ֯C), which shows that the studied formation falls within the oil window, but due to the presence of type IV (oxidized and reworked) organic matter was not able to generate commercial hydrocarbons.

کلیدواژه‌ها

Organic geochemical analysis؛ Patala Formation؛ Kohat Basin؛ Pakistan