Numerous accumulations of CO2 and nitrogen-rich natural gas are known in the hot Pannonian Basin System (PBS), where even the mixture of these two fluids is a common phenomenon. The Danube Basin, part of the PBS, is characterized by the predominance of CO2 and nitrogen-rich natural gas over “normal” natural gas. The multistacked Répcelak and Mihályi gas accumulations (southern, Hungarian part of the Danube Basin) display an upward increase of nitrogen-rich natural gas at the expense of CO2. This study, using the abundant public data, the published results and the new biomarker data obtained from oil traces, attempts to explain the formation of these multistacked accumulations. A synoptic view of the vertical changes in gas composition, the maturation history of the basin and its basement, the chronology of the Neogene basaltic volcanism and the biomarker pattern of the oil traces resulted in the recognition of the metasedimentary origin of the nitrogen-rich natural gas and in a relative chronology of the mixing of the two gases and the oil.
Árkai, P., Z. Horváth, M. Tóth 1987: Regional metamorphism of the East Alpine type Paleozoic basement, Little Plain, W-Hungary: mineral assemblages, illite crystallinity — b0 and coal rank data. — Acta Geologica Hungarica, 30, pp. 153–175.
Tóth M. , 'Regional metamorphism of the East Alpine type Paleozoic basement, Little Plain, W-Hungary: mineral assemblages, illite crystallinity — b0 and coal rank data ' (1987 ) 30 Acta Geologica Hungarica : 153 -175 .
Badics, B., I. Vető 2012: Source rocks and petroleum systems in the Hungarian part of the Pannonian Basin: The potential for shale gas and shale oil plays. — Marine and Petroleum Geology, 31, pp. 53–69.
Vető I. , 'Source rocks and petroleum systems in the Hungarian part of the Pannonian Basin: The potential for shale gas and shale oil plays ' (2012 ) 31 Marine and Petroleum Geology : 53 -69 .
Balázs, E. 1971: A Kisalföld medencealjzatának ópaleozóos kőzetei (The basement Paleozoic rocks of the Little Plain). — MÁFI Évi Jelentése 1969-ről, pp. 659–673.
Balázs E. , '', in MÁFI Évi Jelentése 1969-ről , (1971 ) -.
Balázs, E. 1975: A kisalföldi medence paleozóos képződményei (The Paleozoic Formations of the Little Plain basin). — Földtani Kutatás, 18, pp. 17–25.
Balázs E. , 'A kisalföldi medence paleozóos képződményei (The Paleozoic Formations of the Little Plain basin) ' (1975 ) 18 Földtani Kutatás : 17 -25 .
Balogh, K., Á. Jámbor, Z. Partényi, L. Ravaszné Baranyai, G. Solti 1982: A dunántúli bazaltok K/Ar radiometrikus kora (K/Ar radiogenic age of Transdanubian basalts). — MÁFI Évi Jelentése 1980-ról, pp. 243–259. (In Hungarian with English summary.)
Solti G. , '', in MÁFI Évi Jelentése 1980-ról , (1982 ) -.
Balogh, K., E. Árva-Sós, Z. Pécskay, L. Ravasz-Baranyai 1986: K/Ar dating of post-Sarmatian alkali basaltic rocks in Hungary. — Acta Mineralogica et Petrographica, Szeged, 28, pp. 75–94.
Ravasz-Baranyai L. , 'K/Ar dating of post-Sarmatian alkali basaltic rocks in Hungary ' (1986 ) 28 Acta Mineralogica et Petrographica, Szeged : 75 -94 .
Borsy, Z., K. Balogh, M. Kozák, Z. Pécskay 1986: Újabb adatok a Tapolcai-medence fejlődéstörténetéhez (Contributions to the evolution of the Tapolca-basin, Hungary). — Acta Geographica Debrecina, 23, pp. 79–104. (In Hungarian with English abstract.)
Pécskay Z. , 'Újabb adatok a Tapolcai-medence fejlődéstörténetéhez (Contributions to the evolution of the Tapolca-basin, Hungary) ' (1986 ) 23 Acta Geographica Debrecina : 79 -104 .
Boudou, J.P., A. Schimmelmann, M. Ader, M. Mastalerz, M. Sebilo, L. Gengembre 2008: Organic nitrogen chemistry during low-grade metamorphism. — Geochimica et Cosmochimica Acta, 72, pp. 1199–1221.
Gengembre L. , 'Organic nitrogen chemistry during low-grade metamorphism ' (2008 ) 72 Geochimica et Cosmochimica Acta : 1199 -1221 .
Clayton, J.L., C.W. Spencer, I. Koncz, Á. Szalay 1990: Origin and migration of hydrocarbon gases and carbon dioxide, Békés Basin, southeastern Hungary. — Organic Geochemistry, 15, pp. 233–247.
Szalay Á. , 'Origin and migration of hydrocarbon gases and carbon dioxide, Békés Basin, southeastern Hungary ' (1990 ) 15 Organic Geochemistry : 233 -247 .
Cornides, I., N. Takaoka, K. Nagao, S. Matsuo 1986: Contribution of mantle-derived gases to subsurface gases in a tectonically quiescent area, the Carpathian Basin, Hungary revealed by noble gas measurements. — Geochemical Journal, 20, pp. 119–125.
Matsuo S. , 'Contribution of mantle-derived gases to subsurface gases in a tectonically quiescent area, the Carpathian Basin, Hungary revealed by noble gas measurements ' (1986 ) 20 Geochemical Journal : 119 -125 .
Csizmeg, J., B. Márton, Á. Szalay, I. Vető, M. Peffer, G. Varga, Gy. Pogácsás 2012: Neogene hydrocarbon potential and inert gas risk in the Hungarian part of the Danube basin — 29th IAS Meeting of Sedimentology, Sedimentology in the Heart of the Alps, Schladming, Austria, p. 343
Pogácsás G. , '', in 29th IAS Meeting of Sedimentology, Sedimentology in the Heart of the Alps, Schladming, Austria , (2012 ) -.
Didyk, B.M., B.R.T. Simoneit, S.C. Brassel, G. Eglington 1978: Organic geochemical indicators of paleoenvironmental conditions of sedimentation. — Nature, 272, pp. 216–222.
Eglington G. , 'Organic geochemical indicators of paleoenvironmental conditions of sedimentation ' (1978 ) 272 Nature : 216 -222 .
Franko, O., D. Vass, J. Francu, M. Král, M. Pereszlényi, J. Milicka 1992: First occurrence of oil in the Slovak part of the Danube basin. — Mineralia slovaca, 24, pp. 453–460. (In Slovakian.)
Milicka J. , 'First occurrence of oil in the Slovak part of the Danube basin ' (1992 ) 24 Mineralia slovaca : 453 -460 .
Fülöp, J. 1990: Magyarország geológiája, Paleozoikum I. (Geology of Hungary, Paleozoic I.) — Hungarian Geological Institute, pp. 74–97.
Fülöp J. , '', in Hungarian Geological Institute , (1990 ) -.
Gerling, P., E. Idiz, G. Everlien, E. Sohns 1997: New aspects on the origin of nitrogen in natural gas in Northern Germany. — Geologisches Jahrbuch, Reihe D, 103, pp. 65–84.
Sohns E. , 'New aspects on the origin of nitrogen in natural gas in Northern Germany ' (1997 ) 103 Geologisches Jahrbuch, Reihe D : 65 -84 .
Gulyás, Á. (Ed.), J. Kiss 2006: Magnetic dZ anomaly map of Hungary. — Eötvös Loránd Geophysical Institute of Hungary
Kiss J. , '', in Eötvös Loránd Geophysical Institute of Hungary , (2006 ) -.
Haas, J., T. Budai, L. Csontos, L. Fodor, Gy. Konrád 2010: Pre-Cenozoic geological map of Hungary, 1:500 000 — Hungarian Geological Institute.
Konrád G. , '', in Pre-Cenozoic geological map of Hungary, 1:500 000 , (2010 ) -.
Harangi, Sz., O. Vaselli, S. Tonarini, Cs. Szabó, R. Harangi, N. Coradossi 1995: Petrogenesis of Neogene extension-related alkaline volcanic rocks of the Little Hungarian Plain Volcanic Field (Western Hungary). — Acta Vulcanologica, 7, pp. 173–187.
Coradossi N. , 'Petrogenesis of Neogene extension-related alkaline volcanic rocks of the Little Hungarian Plain Volcanic Field (Western Hungary) ' (1995 ) 7 Acta Vulcanologica : 173 -187 .
Hatalyák, P., P. Zahuczki, G. Wittmann, I. Berkes, G. Németh 2011: Discovery of the Nagykőrös-South gas field (Hungary) and its production possibilities. — MOL Szakmai-Tudományos Közlemények, 2011, pp. 74–80.
Németh G. , 'Discovery of the Nagykőrös-South gas field (Hungary) and its production possibilities ' (2011 ) 2011 MOL Szakmai-Tudományos Közlemények : 74 -80 .
Hrušecký, I. 1999: Central Part of the Danube Basin in Slovakia: Geophysical and Geological Model in Regard to Hydrocarbon Prospection. — EGRSE Special Issue VI.1., pp. 2–55.
Hrušecký I. , '', in EGRSE Special Issue VI.1. , (1999 ) -.
Juhász, Gy. 1991: Lithostratigraphical and sedimentological framework of the Pannonian (s.l.) sedimentary sequence in the Hungarian Plain (Alföld), Eastern Hungary. — Acta Geologica Hungarica, 34, pp. 53–72.
Juhász G. , 'Lithostratigraphical and sedimentological framework of the Pannonian (s.l.) sedimentary sequence in the Hungarian Plain (Alföld), Eastern Hungary ' (1991 ) 34 Acta Geologica Hungarica : 53 -72 .
Koncz, I. 1983: The stable carbon isotope composition of the hydrocarbon and carbon dioxide components of Hungarian natural gases. — Acta Mineralogica-Petrographica, Szeged. 26, pp. 33–49.
Koncz I. , 'The stable carbon isotope composition of the hydrocarbon and carbon dioxide components of Hungarian natural gases ' (1983 ) 26 Acta Mineralogica-Petrographica, Szeged : 33 -49 .
Koncz, I., O. Etler 1994: Origin of oil and gas occurrences in the Pliocene sediments of the Pannonian Basin. — Organic Geochemistry, 21, pp. 1069–1080.
Etler O. , 'Origin of oil and gas occurrences in the Pliocene sediments of the Pannonian Basin ' (1994 ) 21 Organic Geochemistry : 1069 -1080 .
Kőrössy, L. 1989: A dráva-medencei koolaj- és földgázkutatás földtani eredménye (Hydrocarbon geology of the Drava Basin in Hungary). — Általános Földtani Szemle, 24, pp. 3–122. (In Hungarian with English abstract.)
Kőrössy L. , 'A dráva-medencei koolaj- és földgázkutatás földtani eredménye (Hydrocarbon geology of the Drava Basin in Hungary) ' (1989 ) 24 Általános Földtani Szemle : 3 -122 .
Kovać, M., R. Synak, K. Fordinál, P. Joniak, Cs. Tóth, R. Vojtko, A. Nagy, I. Baráth, J. Maglay, J. Minár 2011: Late Miocene and Pliocene history of the Danube Basin: inferred from development of depositional systems and timing of sedimentary facies changes. — Geologica Carpathica, 62, pp. 519–534.
Minár J. , 'Late Miocene and Pliocene history of the Danube Basin: inferred from development of depositional systems and timing of sedimentary facies changes ' (2011 ) 62 Geologica Carpathica : 519 -534 .
Krooss, B., L. Friberg, Y. Gensterblum, J. Hollenstein, D. Prinz, R. Littke 2005: Investigation of the pyrolytic liberation of molecular nitrogen from Palaeozoic sedimentary rocks. — International Journal of Earth Sciences, 94, pp. 1023–1038.
Littke R. , 'Investigation of the pyrolytic liberation of molecular nitrogen from Palaeozoic sedimentary rocks ' (2005 ) 94 International Journal of Earth Sciences : 1023 -1038 .
Krupskij, Y.Z. 1992: Zakarpatsskij progib — nova gazonosna oblast’ Ukraini. — Geologicheski Zhurnal, 1992, pp. 70–75. (In Ukrainian.)
Krupskij Y.Z. , 'Zakarpatsskij progib — nova gazonosna oblast’ Ukraini ' (1992 ) 1992 Geologicheski Zhurnal : 70 -75 .
Ladwein, H.W. 1988: Organic geochemistry of the Vienna Basin: model for hydrocarbon generation in overthrust belts. — AAPG Bull., 72, pp. 586–599.
Ladwein H.W. , 'Organic geochemistry of the Vienna Basin: model for hydrocarbon generation in overthrust belts ' (1988 ) 72 AAPG Bull. : 586 -599 .
Lenkey, L., P. Dövényi, F. Horváth, S.A.P.L. Cloething 2002: Geothermics of the Pannonian basin and its bearing on the neotectonics. — EGU Stephan Mueller Special Publication Series, 3, pp. 29–40.
Cloething S.A.P.L. , 'Geothermics of the Pannonian basin and its bearing on the neotectonics ' (2002 ) 3 EGU Stephan Mueller Special Publication Series : 29 -40 .
Littke, R., B. Krooss, E. Idiz, J. Frielingsdorf 1995: Molecular nitrogen in natural gas accumulations: generation from sedimentary organic matter at high temperatures. — AAPG Bulletin, 79, pp. 410–430.
Frielingsdorf J. , 'Molecular nitrogen in natural gas accumulations: generation from sedimentary organic matter at high temperatures ' (1995 ) 79 AAPG Bulletin : 410 -430 .
Magyar, I., D.H. Geary, P. Müller 1999: Paleogeographic evolution of the Late Miocene Lake Pannon in Central Europe. — Paleogeography, Paleoclimatology, Paleoecology, 147, pp. 151–167.
Müller P. , 'Paleogeographic evolution of the Late Miocene Lake Pannon in Central Europe ' (1999 ) 147 Paleogeography, Paleoclimatology, Paleoecology : 151 -167 .
Magyar, I., M. Lantos, K. Ujszászi, L. Kordos 2007: Magnetostratigraphic, seismic and biostratigraphic correlations of the Upper Miocene sediments in the northwestern Pannonian Basin System. — Geologica Carpathica, 58, pp. 277–290.
Kordos L. , 'Magnetostratigraphic, seismic and biostratigraphic correlations of the Upper Miocene sediments in the northwestern Pannonian Basin System ' (2007 ) 58 Geologica Carpathica : 277 -290 .
Magyar, I., D. Radivojevic, O. Sztanó, R. Synak, K. Ujszászi, M. Pócsik 2012: Progradation of the paleo-Danube shelf margin across the Pannonian Basin during the Late Miocene and Early Pliocene. — Global and Planetary Change, 103, pp. 168–173.
Pócsik M. , 'Progradation of the paleo-Danube shelf margin across the Pannonian Basin during the Late Miocene and Early Pliocene ' (2012 ) 103 Global and Planetary Change : 168 -173 .
Maros, Gy., V. Maigut, R. Barczikayné Szeiler, L. Fodor, L. Gyalog, Zs. Kercsmár, Á. Magyari, L. Orosz, K. Palotás, I. Selmeczi, A. Uhrin, Zs. Vikor, B. Atzenhofer, R. Berka, M. Bottig, A. Brüstle, C. Hörfarter, G. Schubert, J. Weilbold, I. Baráth, K. Fordinál, B. Kronome, J. Maglay, A. Nagy, B. Jelen, H. Rifelj, I. Rižnar, M. Trajanova 2011: Pre-Cenozoic model horizon grid for Supra-Regional Area. — Transenergy, Geological and Geophysical Institute of Hungary, State Geological Institute of Dionyz Stur, Geological Survey of Austria, Geological Survey of Slovenia.
Trajanova M. , '', in Transenergy, Geological and Geophysical Institute of Hungary, State Geological Institute of Dionyz Stur, Geological Survey of Austria, Geological Survey of Slovenia , (2011 ) -.
Mattick, R.E., P.G. Teleki, R.L. Phillips, J.L. Clayton, Gy. Dávid, Gy. Pogácsás, B. Bardócz, E. Simon 1996: Structure, Stratigraphy, and Petroleum Geology of the Little Plain Basin, Northwestern Hungary. — AAPG Bulletin, 80, pp. 1780–1800.
Simon E. , 'Structure, Stratigraphy, and Petroleum Geology of the Little Plain Basin, Northwestern Hungary ' (1996 ) 80 AAPG Bulletin : 1780 -1800 .
Mészáros, L. 1970: Report on exploration of the Mihályi occurrence. — MBFH Open File Report No T 8721. (In Hungarian.)
Mészáros L. , '', in MBFH Open File Report No T 8721 , (1970 ) -.
Mészáros, L. 1979: Report on exploration of the Mihályi-Répcelak occurrences — MBFH Open File Report No T 18580. (In Hungarian.)
Mészáros L. , '', in MBFH Open File Report No T 18580 , (1979 ) -.
Pearce J., I. Czernichowski-Lauriol, S. Lombardi, S. Brune, A. Nádor, J. Baker, Pauwels, G. Hatziyannis, S. Beaubien, E. Faber 2004: A review of natural CO2 accumulations in Europe as analogues for geological sequestration. A review of natural CO2 accumulations in Europe as analogues for geological sequestration. — Geological Society, London, Special Publications, 233, pp. 29–41.
Faber E. , 'A review of natural CO2 accumulations in Europe as analogues for geological sequestration. A review of natural CO2 accumulations in Europe as analogues for geological sequestration ' (2004 ) 233 Geological Society, London, Special Publications : 29 -41 .
Sachsenhofer, R.F. 1994: Petroleum generation and migration in the Styrian Basin (Pannonian Basin system, Austria): an integrated geochemical and numerical modelling study. — Marine and Petroleum Geology, 11, pp. 684–701.
Sachsenhofer R.F. , 'Petroleum generation and migration in the Styrian Basin (Pannonian Basin system, Austria): an integrated geochemical and numerical modelling study ' (1994 ) 11 Marine and Petroleum Geology : 684 -701 .
Sajgó, Cs. 1984: Organic geochemistry of crude oils from south-east Hungary. — In: Schenck, P.A. et al. (Eds): Advances in Organic Geochemistry, Pergamon Press, pp. 569–578.
Sajgó, Cs. 2000: Assessment of generation temperatures of crude oils. — Organic Geochemistry, 31, pp. 1301–1323.
Sajgó C. , 'Assessment of generation temperatures of crude oils ' (2000 ) 31 Organic Geochemistry : 1301 -1323 .
Šarković, M., S. Stanković S. Milosavljević, G. Karović 1992: Petroleum Geology of the Southeast Pannonian Basin — Results, Problems, and Future Exploration Strategy. — In: Spencer, A.M. (Ed.): Generation, Accumulation and Production of Europe’s Hydrocarbons II. Spec. Publ. EAPG, No 2, pp. 200–209.
Karović G. , '', in Generation, Accumulation and Production of Europe’s Hydrocarbons II. Spec. Publ. EAPG , (1992 ) -.
Sherwood Lollar, B., C.J. Ballentine, R.K. O’Nions 1997: The fate of mantle-derived carbon in a continental sedimentary basin: Integration of C/He relationships and stable isotope signatures. — Geochimica et Cosmochimica Acta, 61, pp. 2295–2307.
O’Nions R.K. , 'The fate of mantle-derived carbon in a continental sedimentary basin: Integration of C/He relationships and stable isotope signatures ' (1997 ) 61 Geochimica et Cosmochimica Acta : 2295 -2307 .
Tari, G. 1994: Alpine tectonics of the Pannonian Basin. — PhD dissertation, Rice University, Houston, Texas, 501 p.
Tari G. , '', in Alpine tectonics of the Pannonian Basin , (1994 ) -.
Tari, G., F. Horváth 2010: A Dunántúli-középhegység helyzete és eoalpi fejlődéstörténete a Keleti-Alpok takarós rendszerében: egy másfél évtizedes tektonikai modell időszerûsége (Eo-Alpine evolution of the Transdanubian Range in the nappe system of the Eastern Alps: revival of a 15 years old tectonic model) — Bull. of the Hung. Geol. Soc., 140, pp. 483–510.
Horváth F. , 'A Dunántúli-középhegység helyzete és eoalpi fejlődéstörténete a Keleti-Alpok takarós rendszerében: egy másfél évtizedes tektonikai modell időszerûsége (Eo-Alpine evolution of the Transdanubian Range in the nappe system of the Eastern Alps: revival of a 15 years old tectonic model) ' (2010 ) 140 Bull. of the Hung. Geol. Soc. : 483 -510 .
Thompson, K.F.M. 1979: Light hydrocarbons in subsurface sediments. — Geochimica et Cosmochimica Acta, 43, pp. 657–672.
Thompson K.F.M. , 'Light hydrocarbons in subsurface sediments ' (1979 ) 43 Geochimica et Cosmochimica Acta : 657 -672 .
Uhrin, A. 2011: Lake-level changes and their controlling factors in some sub-basins of the Late Miocene Lake Pannon. — PhD dissertation, Eötvös Loránd University, Budapest, Hungary, 127 p.
Uhrin A. , '', in Lake-level changes and their controlling factors in some sub-basins of the Late Miocene Lake Pannon , (2011 ) -.
Vass, D., M. Pereszlényi, M. Kovac, M. Král 1990: Outline of Danube basin geology. — Földtani Közlöny, 120, pp. 193–214.
Král M. , 'Outline of Danube basin geology ' (1990 ) 120 Földtani Közlöny : 193 -214 .
Vető, I. 1988: Organic matter of Lower Triassic formations in the Transdanubian Mid-Mountains. Hydrocarbons and migration. — Annals of the Hungarian Geological Institute, 65/2, pp. 323–331. (In Hungarian with English abstract.)
Vető I. , 'Organic matter of Lower Triassic formations in the Transdanubian Mid-Mountains. Hydrocarbons and migration ' (1988 ) 65 Annals of the Hungarian Geological Institute : 323 -331 .
Vető, I. 2005: Indigenous and imported gases in the Pannonian basin system. — Abstracts of the 22nd International Meeting on Organic Geochemistry Seville — Spain. September 12–16, p. 496.
Vető I. , '', in Abstracts of the 22nd International Meeting on Organic Geochemistry Seville , (2005 ) -.
Vető, I., I. Gajdos, K.D. Lőrincz, S. Pap 1997: Origin of nitrogen-rich gases in Eastern Hungary, Pannonian Basin. — 18th Int. Meeting on Org. Geochem., Maastricht, Abstracts, pp. 229–230.
Pap S. , '', in 18th Int. Meeting on Org. Geochem., Maastricht, Abstracts , (1997 ) -.
Weinlich, F.H., K. Bräuer, H. Kämpf, G. Strauch, J. Tesar, S.M. Weise 1999: An active subcontinental mantle volatile system in the western Eger rift, Central Europe: Gas flux, isotopic (He, C, and N) and compositional fingerprints. — Geochimica et Cosmochimica Acta, 63, pp. 3653–3671.
Weise S.M. , 'An active subcontinental mantle volatile system in the western Eger rift, Central Europe: Gas flux, isotopic (He, C, and N) and compositional fingerprints ' (1999 ) 63 Geochimica et Cosmochimica Acta : 3653 -3671 .
Wijbrans, J., K. Németh, U. Martin, K. Balogh 2007: 40Ar/39Ar geochronology of Neogene phreatomagmatic volcanism in the western Pannonian Basin, Hungary. — Journal of Volcanology and Geothermal Research, 164, pp. 193–204
Balogh K. , '40Ar/39Ar geochronology of Neogene phreatomagmatic volcanism in the western Pannonian Basin, Hungary ' (2007 ) 164 Journal of Volcanology and Geothermal Research : 193 -204 .