Rock-Eval analysis and organic petrographical characterization of the Upper Jurassic Naokelekan Formation, northern Mesopotamian basin, Kurdistan Region-Iraq

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Δημοσιευμένα: Jul 23, 2020
DOI: https://doi.org/10.12681/bgsg.22842
Rzger Abdula
https://orcid.org/0000-0003-1045-8720
Kamal Kolo
Maria-Elli Damoulianou
Victoria Raftopoulou
Polla Khanaqa
Stavros Kalaitzidis
Department of Geology, University of Patras, 26504, Rio-Patras, Greece
https://orcid.org/0000-0002-1134-201X
Περίληψη

The aim of this study is to assess the type, thermal maturity and the petroleum generation potential of the Upper Jurassic Naokelekan Formation, occurring across the Kurdistan Region of Iraq, by applying organic petrographical methods and Rock-Eval analysis. The Rock-Eval data would indicate the presence of kerogen types III, IV and II as the main constituents. However, the qualitative petrographical evaluation revealed that the main organic constituents are solid hydrocarbons, in the form of microgranular migrabitumens, with minor amounts of pyrobitumens. These secondary particles have affected the results of the Rock-Eval analysis and would have led to misinterpretation of organic matter typification based on pyrolysis results only. The combined results of petrography and pyrolysis indicate an active petroleum system within the Upper Jurassic sequence, where hydrocarbons are generated and reservoired within suitable lithologies.

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