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Global Geology 2021, 24(4) 213-225 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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| 论文 |
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摘要：
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关键词：
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Organic geochemistry and source rock potential assessment
of Late Paleocene Patala Formation in Margalla Hill Ｒange，North Pakistan |
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Shams M． Kamran1
，WANG Pujun1
，Nasar Khan2
and Muhammad Hassan1* |
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1． College of Earth Sciences，Jilin University，Changchun 130061，China;
2． Department of Geology，University of Malakand，Chakdara 18800，Khyber Pakhtunkhwa，Pakistan |
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Abstract:
Black shales of the Paleocene Patala Formation are proven source rocks for conventional hydrocarbons
in southern Potwar Basin of Pakistan and are assumed to be effective source rocks towards north in the Margalla Hill Ｒange of Pakistan． In this regard，the current study focuses on source rock geochemistry of the Paleocene Patala Formation to assess its source rock potential，organic matter types and thermal maturity levels in the Margalla Hill Ｒange of North Pakistan． Source rock generative potential，kerogen types and thermal maturation of the analysed rock samples were unraveled by using Ｒock-Eval pyrolysis Tmax，TOC ( total organic carbon) and vitrinite reflectance ( Ｒ0 ) analyses． TOC analysis coupled with S2 yield revealed poor to fair source rock quality encountered within the formation． The pyrolysis Tmax vs Hydrogen Index ( HI) ，showed mostly Type III kerogen dominated by thermally immature to mature organic matter． The HI and genetic potential is low and revealed
poor hydrocarbon generation potential of the formation． The S1 vs TOC plots confirm the indigenous nature of the hydrocarbons hosted by Patala Formation． The vitrinite reflectance outcomes indicated immature to mature source rock beds lying in dry gas zone． The HI and OI signatures and abundance of Type III kerogen are indicating dominance of terrestrial organic matter within the formation． Overall，the investigated Patala Formation exposed at the studied section of Margalla Hill Ｒange，Pakistan acts as a poor source rock unit for liquid hydrocarbon generation but holds prospects for dry gas generation in the study area． |
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Keywords:
Patala Formation
organic geochemistry
thermal maturity
Margalla Hill Ｒange
North Pakistan;
eastern Tethys
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