Abstract:
An extensive geochemical study is conducted to evaluate source rock potential of Datta shales in the Potwar Sub-basin through TOC measurement, Rock Eval pyrolysis, organic petrography, and biomarkers analysis. The study examines the source input, environment of deposition and thermal alteration of organic matter along with oil-source correlation using core/well-cuttings data of Toot-17 well. The results indicate that a significant percentage of Datta shales samples show fair to good potential and early to late mature stage having Type-III kerogen with vitrinite as a dominant maceral. However, a fraction of Datta shale with HI values less than 50 mg HC/g TOC has Type-IV kerogen and predominantly inertinite macerals. The biomarker composition analysis and microscopic investigation indicate that primarily terrestrial organic matter was deposited in a marine environment under relatively suboxic conditions. Stereoisomeric composition of steranes and terpanes indicate that the samples are thermally mature, falling in late oil window. Furthermore, Pr/nC17 and Ph/nC18 values indicate that the samples are not biodegraded. The star correlation diagrams for oil-source correlation exhibit significant similarities between crude oil and Datta shale samples, thereby suggesting Datta shales as source for the oil.
Page(s):
1-1
DOI:
DOI not available
Published:
Journal: Seventh International Conference on Earth Sciences Pakistan (ESP-2024), June 2-4, 2024 (Abstract Book), Volume: 0, Issue: 0, Year: 2024