POCHODZENIE I ZAGROŻENIA SIARKOWODOREM I WYSOKOCIŚNIENIOWYM GAZEM ZIEMNYM W ZŁOŻU KOPALŃ RUD MIEDZI POLKOWICE-SIEROSZOWICE I RUDNA – WSTĘPNE BADANIA IZOTOPOWE I MINERALOGICZNE

Abstract

ORIGIN AND HAZARDS OF HYDROGEN SULPHIDE AND HIGH-PRESSURE NATURAL GAS IN DEPOSITS OF POLKOWICE-SIEROSZOWICE AND RUDNA COPPER ORE MINES: PRELIMINARY ISOTOPIC AND MINERALOGICAL STUDIESAbstract. Composition of natural gas from the Zechstein Limestone (Ca1) strata of Rudna mine has been compared with the natural gas from Carboniferous, Rotliegend strata of the Fore-Sudetic Monocline and with gas generated from the organic matter of the Main Dolomite during hydrous pyrolysis experiments. The gas from Rudna mine is characterized by the normal methane–ethane–propane isotopic system which indicates formation in one stage from a single source rock probably of the Carboniferous age containing kerogen of mixed II/III type. Generation of the hydrogen sulphide resulted from the microbial sulphate reduction processes of the basal anhydrite has been proven by mineralogical and isotopic 13C/12C analyses of 12 carbonate and 34S/35S analyses of 14 sulphate samples. These samples were collected in the mine at the depth of about 900–1200 m at temperature range of 35–45°C and two samples of carbonates were taken from one core.