Free hydrogen-hydrocarbon gases from the Lovozero loparite deposit (Kola Peninsula, NW Russia)

Nivin, V. A.

doi:10.1016/j.apgeochem.2016.09.003

Cited by 17 publications

(24 citation statements)

References 56 publications

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“…Unexpectedly, the occurrence of hydrogen in continental shallow wells has been noted, as in Mali while drilling for water [37], in oil an gas exploration in Kansas, USA [13] or in basement rocks mines [30,44]. Monitoring of H 2 -enriched natural gases leaking from mines long existed in the Kola Peninsula in Russia to prevent accidents from happening, as such gas mixture is easily combustible and explosive [29,30]. Published studies have reported a non-permanent H 2 concentration, interpreted in terms of free gas escaping associated to permeability changes in relation to pressure variations (mining activity, earthquake and possibly earth tide).…”

Section: Introductionmentioning

confidence: 99%

Natural hydrogen continuous emission from sedimentary basins: The example of a Brazilian H2-emitting structure

Prinzhofer

Moretti

Francolin³

et al. 2019

International Journal of Hydrogen Energy

112

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et al.. Natural hydrogen continuous emission from sedimentary basins: The example of a Brazilian H2emitting structure. apos;agostino, et al.. Natural hydrogen continuous emission from sedimentary basins: The example of a Brazilian H2-emitting structure. Available online xxx Keywords: Natural hydrogen Soil micro-seeps Hydrogen geochemical soil monitoring São Francisco basin a b s t r a c tHydrogen escaping from sedimentary basins has already been described in various parts of the world. Some of these leakages have been identified by superficial circular depressions, also called "fairy circles". Gas detection measurements, randomly repeated after a few months have shown that the amount of hydrogen present in soils is not constant neither versus time nor versus position in a given structure. Permanent monitoring gas analyzers were installed in the ground to estimate hydrogen flow outgassing from a topographical circular depression located in Brazil. Data show that a hydrogen flux occurs during the hottest moment of the day, as shown with permanent sensors set at a regular spacing. The process may look like a soil evaporation. In that same structure, other detectors show much higher and irregular gas output which present an unclear correlation as a function of ambient temperature and atmospheric pressure. The relationship with temperature suggests a role of water saturation driving the overall hydrogen fluxes. The reported geochemical data imply that (1) one measurement taken at a given hour on a structure cannot be considered as quantitative, as it varies too much with time and is also probably related to the soil perturbation induced by the shallow drilling, (2) hydrogen released through the soils of the studied structure is recharged daily, (3) hydrogen flux is high enough to reach the surface without being buffered by water or bacterial activity within the soil and (4) soil cannot be solely considered as a hydrogen sink but also, at least in some areas, as a hydrogen emitter.This appears to highlight that the subsurface may be considered in this site as a source of natural hydrogen, clearly differentiated from a biochemical system of atmospheric H 2 consumed by bacteria.

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Section: Introductionmentioning

confidence: 99%

Natural hydrogen continuous emission from sedimentary basins: The example of a Brazilian H2-emitting structure

Prinzhofer

Moretti

Francolin³

et al. 2019

International Journal of Hydrogen Energy

112

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“…As in other morphological types of the gas phase in the Lovozero massif [6,8,9], methane is the main component of the gases occluded in vacuoles of fluid inclusions in the minerals [1,4,6,25,64,65]. Most often, these inclusions are gaseous and secondary in the relative formation time.…”

Section: Occluded Hydrocarbon Gasesmentioning

confidence: 99%

“…Still, the occurrence of other forms (morphological types) of such gases are also known in the Khibiny and Lovozero massifs. These freely released, or free gases (FG), are filling systems with varying degrees of interconnected fractures (mainly microfractures), as well as other cavities in the rocks, and diffusely dispersed gases (DDG) that are found in closed and half-open thin and sub-capillary cracks, retained, to a considerable extent, in the adsorbed state, and where diffusion transfer predominates when they are moving [1,4,[6][7][8][9]. The presence and nature of HCG in the rocks of agpaitic complexes is of both geochemical and practical interest.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the first matter is due to the importance of clarifying the role of reduced fluids as possible agents and indicators of the conditions and sequence of the rock and mineral formation, including various types of ore mineralization (e.g., References [5,[10][11][12][13][14][15][16][17]). The applied value is due to the release of hazardous natural combustible and explosive gases into the atmosphere of the underground mines working on mineral deposits associated with nepheline-syenite massifs [1,4,6,9]. The solution to these and other problems is impossible without learning more about the origin of these gases.…”

Section: Introductionmentioning

confidence: 99%

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The Origin of Hydrocarbon Gases in the Lovozero Nepheline-Syenite Massif (Kola Peninsula, NW Russia), as Revealed from He and Ar Isotope Evidence

Nivin

2020

Minerals

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The occurrence of hydrocarbon gases (HCG) in unusually high concentrations for magmatic complexes, in the Lovozero and some other alkaline massifs, is of both geochemical and practical interest. The nature of these gases, despite the long history of research, remains the subject of debate. As an approach to solving this problem, we studied the coupled distribution of occluded HCG and the recognized tracers of various geological processes, such as helium and argon isotopes. The extraction of the gas components trapped in fluid micro-inclusions was carried out by the mechanical crushing of rock and mineral samples. A positive correlation was found between the 3He/4He and CH4/C2H6 ratios, whereas a negative correlation of the latter was found with the 36Ar concentration, which in turn was directly related, in varying degrees, to the content of HCG and most strongly with pentanes. Conjugacy of the processes of the heavier gaseous hydrocarbons, a loss of the deep component of the fluid phase and dilution of it with the atmogenic component was established. In the absence of a correlation between CH4 and 3He, the value of the CH4/3He ratio in the Lovozero gas substantially exceeded the estimates of it in gases of a mantle origin, and mainly corresponded to the crustal values. However, in some samples, a small fraction of mantle methane was allowed. The peculiarities of the relationships between hydrocarbon gases and the isotopes of noble gases indicate a sequential process of abiogenic generation and transformation of HCG at the magmatic and post-magmatic stages during the formation of the Lovozero massif. The obtained results confirm the usefulness of this approach in solving the origin of reduced gases in alkaline igneous systems.

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“…Some continental natural hydrogen seeps have been discovered (Larin et al, 2015;Deville, 2015, Prinzhofer et al, 2019) but we are far from understanding hydrogen sources, hydrogen migration and hydrogen behavior in the subsurface. (Nivin, 2016;Gregory et al, 2019). The interest for the topic was renewed recently and suffers from poor data sets.…”

Section: Introductionmentioning

confidence: 99%

Vaux-en-Bugey (Ain, France): the first gas field produced in France, providing learning lessons for natural hydrogen in the sub-surface?

Deronzier¹,

Giouse

2020

BSGF - Earth Sci. Bull.

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The former Vaux-en-Bugey field, first French methane production from early 20th century, is revisited as a case study to address the present generation and accumulation theories for gases like hydrogen and helium. The volume of the initial gas in place is estimated to be 22 million m3. Based on a composition of 5% of hydrogen and 0.096% of helium, the volumes of these gases in the field were respectively around 1.1 million m3 for hydrogen and 24 000 m3 for helium. The different hypotheses of hydrogen sources are reviewed: serpentinization, hydro-oxidation of siderite, water radiolysis, bio-fermentation, mechanical generation, degassing from depth trough faults, steel corrosion. For helium generation, the different sources of radioactive minerals and intermediate accumulations are examined. The most probable scenario is the hydrogen production by water radiolysis and helium production by radioactive decay in or near the basement, migrating trough deep faults, stored and concentrating in an aquifer with thermogenic methane, then flushed by methane into the gas field, during Jura thrusting. New measurements with portable gas detector, incomplete but including hydrogen, on a former exploration well with accessible flux of gas, give the opportunity to comment gas saturation evolution more than a century after the 1906 discovery. The decreasing of hydrogen content since the discovery of the field is probably due to Sulphate-Reducing Bacteria activity.

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Free hydrogen-hydrocarbon gases from the Lovozero loparite deposit (Kola Peninsula, NW Russia)

Cited by 17 publications

References 56 publications

Natural hydrogen continuous emission from sedimentary basins: The example of a Brazilian H2-emitting structure

Natural hydrogen continuous emission from sedimentary basins: The example of a Brazilian H2-emitting structure

The Origin of Hydrocarbon Gases in the Lovozero Nepheline-Syenite Massif (Kola Peninsula, NW Russia), as Revealed from He and Ar Isotope Evidence

Vaux-en-Bugey (Ain, France): the first gas field produced in France, providing learning lessons for natural hydrogen in the sub-surface?

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