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APPLICATION OF THE PETROLEUM SYSTEM CONCEPT TO NATURAL HYDROGEN EXPLORATION IN SOUTHEAST BULGARIA
Abstract
Natural hydrogen (H2), produced through geological processes in the subsurface, is a potential energy source and is a substantial element of the global energy strategy for a smooth transition to carbon neutrality. The review of the published papers concerning the results of the natural hydrogen exploration, which have been carried out over the past few years, shows that the petroleum system concept could be transformed for the exploration of natural hydrogen. The present research is a case study for applying this concept in the Eastern Rhodopes and the northwestern part of the Thrace Sedimentary Basin, considering the differences and similarities when comparing both systems. The created 3D geological modelling of the sedimentary basin characterises the petroleum system's elements and the possibility of its adaptation into a hydrogen system. Presumed elements, such as source rocks, reservoirs, seals, traps, and migration pathways are distinguished. Possible sources of natural hydrogen are recognised, such as serpentinites from the Rhodope Ophiolite Association, most found in the Eastern Rhodopes. The Maritsa Fault Zone, located to the north of it, plays the role of a probable migration pathways. The other elements of the hydrogen system are included within the range of the sediment section of Tertiary depressions and the northwestern part of the Thrace Basin. The petroleum system concept, by transforming it into a hydrogen system concept, can be applied as a basis for natural hydrogen exploration not only in the study area but also in other areas with similar geological conditions and geotectonic settings.
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References9
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