A polemic. The considerations of T. Gold and S. Soter (Bull. Ver. schweiz. Petroleum-Geol. u. Ing. 1980, 46, 11) concerning the abiogenic formation of natural gas and petroleum do not comply with the chem. point of view. There is no evidence for large quantities of CH4 in the Earth's interior. A transition from CH4 to petroleum is not justified chem. It is not suitable to apply cosmochem. arguments to the terrestrial environment.