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ABSTRACT: The Northeast German Basin (NEGB) is generally regarded as a long-lived intracontinental sedimentary basin. Deeply buried Carboniferous rocks are the main source rocks for hydrocarbon gases and nitrogen in the basin. For the northern part of the NEGB the thermal and burial history was reconstructed and simulated. Open system non-isothermal pyrolysis was used to determine the generation potential of methane and nitrogen and the corresponding kinetic parameters. These experimental data are used in a kinetic model to estimate timing and efficiency of gas generation in the NEGB and to assess, in a subsequent step, the gas migration pathways. Pyrolysis experiments of overmature Carboniferous samples and their corresponding kerogen concentrates indicate that a considerable amount of nitrogen comes from the inorganic matrix, probably ammonium illite. The simulation results reveal that the main methane generation took place during the rapid subsidence of Upper Rotliegend to Middle Triassic sediments. A residual gas potential exists only in the northern parts of the basin.
Journal of Geochemical Exploration 06/2000; 69:263-267. · 2.43 Impact Factor