Występowanie gazów ziemnych w triasie dolnym południowej części basenu permskiego na Niżu Polskim

Barbara Łaszcz-Filakowa

Abstract


ON THE OCCURRENCE OF GAS IN LOWER TRIASSIC OF SOUTHERN PARTS OF THE PERMIAN BASIN IN THE POLISH LOWLANDS

Summary
Traces of gas are fairly common in the Lower Triassic of the Polish Lowlands. They mainly include occurrences of gases dissolved in groundwater. Collector rocks include horizons of sandstones with good collector properties and sufficient sealing by impervious Rhot deposits. There were also found paleostructures and faults presumably acting as vertical migration routes for gases from the Upper Paleozoic Geochemical studies showed that parent rocks of gases from the Lower Triassic include Zechstein Main Dolomite and Upper Carboniferous. Lower Triassic rocks from this region display a classic hydrogeological and geochemical zonality defined by changes in chemical composition of gases. These changes are marked from margins of the sedimentary basin, that is, southetrn part of the Fore-Sudetic Monocline, where gases are rich in nitrogen and relalively poor in methane and may be treated as nitrogen gases, through zones of nitrogen-methane and methane-nitrogen gases to those of methane gases in central parts of the basin. The Dymek-Bełchatów and Buków zones (Fig. 1), situated in the area characterized by the occurrence of methane-nitrogen gases, seem most interesting from the point of view of further; studies and prospecting for gas fields.

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