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 …

Liquid water is essential for life as we know it, ie carbon-based life. Although other
compound-solvent pairs that could exist in very specific physical environments could be …

The origin of natural gases, in particular those containing methane (CH 4 or C 1), ethane (C
2 H 6 or C 2), propane (C 3 H 8 or C 3) and carbon dioxide (CO 2), is commonly interpreted …

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 …

The search for traces of life is one of the principal objectives of Mars exploration. Central to
this objective is the concept of habitability, the set of conditions that allows the appearance …

The genetic identification of different types of natural gas is notably important for assessment
of its sources and exploration potential. The chemical and isotopic (C and H, in particular) …

Subsurface lithoautotrophic microbial ecosystems (SLiMEs) under oligotrophic conditions
are typically supported by H2. Methanogens and sulfate reducers, and the respective energy …

Ethane, propane, and carbon dioxide show reversed carbon isotopic maturity trends in
natural gas produced from the Barnett and Fayetteville Shales at thermal maturities greater …

Coal bed and shale gas can be of thermogenic, microbial or of mixed origin with the
distinction made primarily on the basis of the molecular and stable isotope compositions of …

During studies of unconventional natural gas reservoirs of Silurian and Ordovician age in
the northern Appalachian basin we observed complete reversal of the normal trend of …