Organic geochemistry and hydrocarbon potential of Neogene sedimentary rocks in Hungary

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Abstract

Neogene sedimentary strata in Hungary contain important mineral resources: pelitic rocks, deposited during the last major deltaic depositional cycle in the Pannonian Basin, are considered to be the principal sources of petroleum. The organic-geochemical investigations presented in this paper show that these Neogene sediments not only constitute a good gas-prone source, but are also a fair oil-prone source. About 75% of disseminated organic matter in these deltaic sediments was found to be gas-prone kerogen (Type III), and more than 13% of the examined samples were oil-prone containing Type II kerogen. More than 10% of the sediments contained mixtures of Types II and III kerogens. At the end of the Neogene, highly oil-prone, organic-rich sediments (alginites) were deposited in small volcanic tuff rings which formed during the final episode of basaltic volcanism (3-5 ± 0.9 million yrs ago) in the Pannonian Basin. This depositional environment, together with the richness of the biological precursor material, and the good preservation of algae, resulted in the formation of Types I and II kerogens, which have an excellent liquid hydrocarbon potential. The quality and quantity of organic matter deposited in the two main stages of the deltaic system are different. Thus, sediments deposited during the deep-water stage were found to be fair oil source rocks. As a consequence of the frequent lignite horizons, which illustrate the increasing importance of terrestrial conditions, the shallow-water sequences constitute a gas-prone source rock, with a high organic carbon content.

Original languageEnglish
Pages (from-to)87-96
Number of pages10
JournalJournal of Petroleum Geology
Volume15
Issue number1
Publication statusPublished - Jan 1992

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Sedimentary rocks
organic geochemistry
Geochemistry
Kerogen
Neogene
sedimentary rock
kerogen
Sediments
Hydrocarbons
hydrocarbon
sediment
oil
Rocks
Biological materials
source rock
Gases
gas
organic matter
Mineral resources
Lignite

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Organic geochemistry and hydrocarbon potential of Neogene sedimentary rocks in Hungary. / Hetényi, M.

In: Journal of Petroleum Geology, Vol. 15, No. 1, 01.1992, p. 87-96.

Research output: Contribution to journalArticle

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