Abstract
Various sources for hydrothermal CH4 have been proposed. While carbon isotope studies have narrowed the possibilities, examination of higher hydrocarbon gas (HHG) data permits additional deductions regarding origins. HHGs differ from sedimentary hydrocarbons in possessing tendencies towards a relative excess of methane, higher normal/iso ratios for C4 and C5, and elevated proportions of C6 gases. Despite these differences, HHGs in most cases probably originate like sedimentary gases by thermal degradation of organics. The “excess” methane in HHGs appears to have a geothermometric function. An empirical relationship fitting moderately well a range of geothermal fields worldwide is presented. It is most appropriate for geothermal exploration in areas where there is little direct knowledge of subsurface conditions.
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