20.500.12556/DiRROS-15332 Carbon isotopic composition of methane and its origin in natural gas from the Petišovci-Dolina oil and gas field (Pannonian Basin System, NE Slovenia) – a preliminary study Izotopska sestava ogljika v metanu in njegov izvor v naravnem plinu na območju nafto-plinskega polja Petišovci-Dolina (Panonski bazenski sistem, SV Slovenija) – preliminarna raziskava The carbon isotopic composition of methane (δ13CCH4) in natural gas from the Petišovci-Dolina oil and gas field (NE Slovenia) was measured for the first time in August and September 2021. The gas samples from different depths were taken from three wells: Dolina-deep (Pg-6) from the depth interval 3102–3104 m, Petišovci-deep (Pg-5) from the depth interval 2772–2795 m, and Petišovci-shallow (D-5) from the depth interval 1212–1250 m. According to the available composition dataset of gas, available from the Petrol Geo d.o.o. documentation, the “deep” gases sampled from the Pg-6 and Pg-5 wells consist of 85 % methane (C1), 11 % hydrocarbons heavier than methane (C2–C6) and 4 % CO2. The “shallow” gas from well D-5 contains more than 89 % methane, up to 11 % C2–C6 gases, while the CO2 content is negligible. The “deep« gas from the Pg-6 and Pg-5 wells has δ13CCH4 -36.7 ‰ and -36.6 ‰, respectively, while the “shallow” gas from the D-5 well has the δ13CCH4 of -38.6 ‰. The methane from the “shallow” gas is slightly enriched in the lighter 12C isotope. δ13CCH4 in the range from -38.6 to -36.6 ‰ clearly indicates the thermogenic origin of methane formed during the catagenesis phase of gas formation. Izotopsko sestavo metana (δ13CCH4) v naravnem (zemeljskem) plinu naftno-plinskega polja Petišovci-Dolina (Ormoško-selniška antiklinala, NE Slovenija) smo prvič merili v avgustu in septembru 2021. Plinske vzorce smo vzorčili iz različnih globin iz treh plinskih vrtin: iz Petišovci-globoka (Pg-6) iz globine 3102–3104 m, iz Petišovci-globoka (Pg-5) iz globine 2772–2795 m in iz Dolina-plitva (D-5) iz globine 1212–1250 m. Glede na dostopne podatke o sestavi plina iz dokumentacije Petrol Geo d.o.o., so “globoki” plini iz vrtin Pg-6 in Pg-5 sestavljeni iz 85 % metana (C1), iz 11 % ogljikovodikov, težjih od metana (C2–C6) in 4 % CO2. “Plitvi” plin iz vrtine D-5 je sestavljen iz več kot 89 % metana in do 11 % C2–C6, medtem ko je koncentracija CO2 zanemarljiva. “Globoki” plin iz vrtin Pg-6 in Pg-5 ima δ13CCH4 vrednost od -36.7 do -36.6 ‰, medtem ko ima “plitvi” plin iz vrtine D-5 δ13CCH4 -38.6 ‰. “Plitvi”plin iz vrtine D-5 je obogaten na lažjem 12C izotopu. Razpon δ13CCH4 od -38.6 do -36.6 ‰ jasno kaže termogeni izvor metana, ki je nastal v fazi katageneze nastajanja plina. Petišovci-Dolina gas methane isotopes origin Petišovci-Dolina plin metan izotopi izvor true false true Geološki zavod slovenije Angleški jezik Slovenski jezik Delo ni kategorizirano 2022-07-26 15:20:56 2022-07-26 15:28:01 2022-08-21 03:36:52 0000-00-00 00:00:00 2022 0 0 str. 59-72 no. 1 vol. 65 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 553 0016-7789 10.5474/geologija.2022.004 116539907 1834-Article_Text-12342391-1-10-20220722.pdf 1834-Article_Text-12342391-1-10-20220722.pdf 1 EB68B46DAD3D7F0BD5E9B2BE7C54AC08 adfeb7365fc71dd600fef956a6090588c0087fd75a04eb85f99de194952730d2 fa2e31b9-17b6-11ed-b6b8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=20204 Geološki zavod Slovenije Geologija 0 0 0