Imprints of hydrocarbon-bearing basinal fluids on a karst system: Mineralogical and fluid inclusion studies from the Buda Hills, Hungary

Zsófia Poros, Andrea Mindszenty, F. Molnár, Jacques Pironon, Orsolya Gyori, Paola Ronchi, Zoltán Szekeres

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Calcite veins and related sulphate-sulphide mineralisation are common in the Buda Hills. Also, abundant hypogenic caves are found along fractures filled with these minerals pointing to the fact that young cave-forming fluids migrated along the same fractures as the older mineralising fluids did. The studied vein-filling paragenesis consists of calcite, barite, fluorite and sulphides. The strike of fractures is consistent-NNW-SSE-concluding a latest Early Miocene maximum age for the formation of fracture-filling minerals. Calcite crystals contain coeval primary, hydrocarbon-bearing- and aqueous inclusions indicating that also hydrocarbons have migrated together with the mineralising fluids. Hydrocarbon inclusions are described here for the first time from the Buda Hills. Mixed inclusions, i. e., petroleum with 'water-tail', were also detected, indicating that transcrystalline water migration took place. The coexistence of aqueous and petroleum inclusions permitted to establish the entrapment temperature (80°C) and pressure (85 bar) of the fluid and thus also the thickness of sediments, having been eroded since latest Early Miocene times, was calculated (800 m). Low salinity of the fluids (2 and CH 4 are associated with hydrocarbons. Groundwater also contains small amounts of HC and related gases on the basin side even today. Based on the location of the paleo- and recent hydrocarbon indications, identical migration pathways were reconstructed for both systems. Hydrocarbon-bearing fluids are supposed to have migrated north-westward from the basin east to the Buda Hills from the Miocene on.

Original languageEnglish
Pages (from-to)429-452
Number of pages24
JournalInternational Journal of Earth Sciences
Volume101
Issue number2
DOIs
Publication statusPublished - Mar 2012

Fingerprint

fluid inclusion
karst
hydrocarbon
fluid
calcite
Miocene
cave
petroleum
sulfide
fluorite
barite
mineral
paragenesis
basin
coexistence
crystal
mineralization
sulfate
salinity
water

Keywords

  • Buda Thermal Karst
  • Calcite
  • Hydrocarbon migration
  • Miocene
  • Pannonian Basin
  • Petroleum inclusion

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Imprints of hydrocarbon-bearing basinal fluids on a karst system : Mineralogical and fluid inclusion studies from the Buda Hills, Hungary. / Poros, Zsófia; Mindszenty, Andrea; Molnár, F.; Pironon, Jacques; Gyori, Orsolya; Ronchi, Paola; Szekeres, Zoltán.

In: International Journal of Earth Sciences, Vol. 101, No. 2, 03.2012, p. 429-452.

Research output: Contribution to journalArticle

Poros, Zsófia ; Mindszenty, Andrea ; Molnár, F. ; Pironon, Jacques ; Gyori, Orsolya ; Ronchi, Paola ; Szekeres, Zoltán. / Imprints of hydrocarbon-bearing basinal fluids on a karst system : Mineralogical and fluid inclusion studies from the Buda Hills, Hungary. In: International Journal of Earth Sciences. 2012 ; Vol. 101, No. 2. pp. 429-452.
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