SYSTEM NAFTOWY KARBON-CZERWONY SPĄGOW1EC W NIEMIECKO-HOLENDERSKIEJ CZĘŚCI BASENU - IMPLIKACJE DLA POSZUKIWAŃ ZŁÓŻ GAZU ZIEMNEGO W POLSKIEJ CZĘŚCI BASENU CZERWONEGO SPĄGOWCA

Abstract

THE CARBONIFEROUS-ROTLIEGEND PETROLEUM SYSTEM IN THE GERMAN-DUTCH PART OF THE BASIN - IMPLICATIONS FOR NATURAL GAS EXPLORATION IN THE POLISH PACT OF THE ROTUEGEND BASIN

Abstract. Carboniferous-Rotliegend Petroleum System in the German-Dutch part of the South Permian basin shows a number of similarities and differences in relation to the Polish part of the basin. Depth of occurrence of gas deposits in the German-Dutch part of the basin are larger (~1000-5300 m) than in Poland (~1000-3700 m) with the maximum of up to 4000 tit in the tight gas zone. Gases show significant variation of chemical composition and physical parameters. The average methane content in the German-Dutch part of the basin ranges from 30 to 95% rising rapidly towards the west, whilst in the Polish part, the average methane content varies significantly in different areas of the basin (from several up to 90%). Gases that accumulated mainly in the Rot I iegend, were generated predominantly by Westphalian source rocks (bituminous coals) in the German-Dutch part of the basin, arid only subordinately by Lower Carboniferous source rocks. German-Dutch basin was dissected by numerous Mesozoic faults, associated with horsts, grabens, and platforms. It contributed to the differentiation of burial depth and timing of the generation processes, to the migration and accumulation of gas, and to the diversification of a number of post-Carboniferous reservoir rocks and seals. The processes of gas generation, migration and accumulation included several stages: from Late Carboniferous through Neogene.