TUHO: když země, tak země
HIDDEN HYDROGEN
https://www.science.org/content/article/hidden-hydrogen-earth-may-hold-vast-stores-renewable-carbon-free-fuelThe Malian discovery was vivid evidence for what a small group of scientists, studying hints from seeps, mines, and abandoned wells, had been saying for years: Contrary to conventional wisdom, large stores of natural hydrogen may exist all over the world, like oil and gas—but not in the same places. These researchers say water-rock reactions deep within the Earth continuously generate hydrogen, which percolates up through the crust and sometimes accumulates in underground traps. There might be enough natural hydrogen to meet burgeoning global demand for thousands of years, according to a U.S. Geological Survey (USGS) model that was presented in October 2022 at a meeting of the Geological Society of America.
2022 A PRELIMINARY MODEL OF GLOBAL SUBSURFACE NATURAL HYDROGEN RESOURCE POTENTIAL
https://gsa.confex.com/gsa/2022AM/meetingapp.cgi/Paper/380270Geologic hydrogen (H2) has recently gained interest as a potential primary energy resource. To guide decision-making, policy makers, resource managers, exploration companies, and investors will need information as to the extent of the potential resource. However, the uncertainties associated with the generation, migration, accumulation, and preservation of H2 in the subsurface make it impossible to precisely determine potential resource volumes at this time. Despite the uncertainties, the occurrence and behavior of H2 in the subsurface is not completely unknown. Additional inferences on the occurrence of H2 in the subsurface can be made by employing knowledge derived from studies of fluid migration, accumulation, and preservation related to other geologic resources (e.g., petroleum, geothermal energy, noble gases, etc.). These factors can be combined to provide some constraints on the possible magnitude of geologic H2 resources in the subsurface.
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Stochastic model results indicate a greater than 98% probability of geologic H2 production meeting at least 50% of the forecast green H2 production by the year 2100 and beyond, with long-term renewable H2 production potentially in the range of 100s of Mt per year. Moreover, the model indicates that the residence time of H2 in reservoirs and the annual flux of H2 to the atmosphere are the most influential factors affecting the resource potential, whereas variations in biotic and abiotic consumption of H2 have relatively little effect. These results strongly suggest that additional investigation of the resource potential of natural H2 is warranted. This model provides an initial framework for assessing global H2 resource potential and can be an important tool for guiding future research initiatives.