Using an interdisciplinary approach, this paper reviews current knowledge in the field of
natural hydrogen. For the first time, it combines perspectives on hydrogen from the literature …

Beyond its role as an energy vector, a growing number of natural hydrogen sources and
reservoirs are being discovered all over the globe, which could represent a clean energy …

Recent exploratory wells in Mali (Bourabougou field) targeting natural hydrogen were a
success and provide a new understanding of a first test well exploited by PETROMA …

Over the last 30 years, geochemical research has demonstrated that abiotic methane (CH4),
formed by chemical reactions which do not directly involve organic matter, occurs on Earth in …

The aqueous alteration of ultramafic rocks through serpentinization liberates mantle carbon
and reducing power. Serpentinization occurs in numerous settings on present day Earth …

In this introductive chapter, basic concepts concerning natural gas seepage, including the
terminology typically adopted for various types of seepage, the origins of gas (microbial …

Hydrogen is a key energy source for subsurface microbial processes, particularly in
subsurface environments with limited alternative electron donors, and environments that are …

The conditions of methane (CH4) formation in olivine-hosted secondary fluid inclusions and
their prevalence in peridotite and gabbroic rocks from a wide range of geological settings …

Serpentinization involves the hydrolysis and transformation of primary ferromagnesian
minerals such as olivine ((Mg, Fe) 2SiO4) and pyroxenes ((Mg, Fe) SiO3) to produce H2-rich …

Natural hydrogen is accumulating in the form of “blend gases”, with the association mainly of
methane, nitrogen, and helium. The extreme variation of proportion between these four gas …