The hydrogen / carbon ratio, another proof of the mineral origin of hydrocarbons

In all oilfields and wells it is observed that the hydrogen / carbon ratio increases with depth, showing a loss of hydrogen as the fluid rises and approaches the surface.
For reasons of density, one would imagine that hydrogen-rich compounds, which are less dense, should be found in the upper strata, while hydrogen-poor substances, because they are heavier, should be in deeper zones.
However it is the other way around. The less dense compounds are down while the denser ones are above.
The only logical process that explains this trend of hydrocarbon deposits is the upward migration of hydrocarbons (due to planet degassing) and the separation (usually by preferential oxidation) of hydrogen versus carbon during flow.
T. Gold (2001) argues that this process is due in part to the action of bacteria that live at depth less than 10 km (hyperthermobacteria).
According to this approach, methane and other gases would be found in the lower layers, while heavier hydrocarbons (eg naphthas and liquid oils in general) would be located in the intermediate layers and bitumens and coals in the upper layers.
These processes are explained in more detail in the following chapters.
From the book "Inexhaustible? Gas and Oil", by D.Anton, Piriguazú Ediciones