Abstract
ABSTRACT950 samples were analysed to study the possibility of using information on hydrogen in the evaluation of regional, zonal and local hydrocarbon potential. The main method for identifying that hydrogen is of natural origin is by comparison with the δD of hydrogen of technical origin that is −792‰. As an added criterion for recognizing the origin of hydrogen in wells the investigation of changes in gas composition within the borehole section is proposed. The distribution of hydrogen in the free and adsorbed states and the role of hydrogen in hydrocarbon gas formation have been evaluated. These data combined with tests on hydrogen absorption establish a difference between oil and gas generation in terrigenous and carbonate rocks caused by different types of organic matter and by the ability of hydrogen to be preserved in the crystal lattice of carbonate minerals. This absorbed hydrogen promotes HC generation and also changes the physical properties of limestones producing fundamentally different styles of fracture genesis.
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