Abstract
Intrusive traps influence the distribution of natural gases. Content of gaseous hydrocarbons is associated with rock type and increases from dolerites to metamorphosed and sedimentary formations. Concentrations of these gases in dolerites depend on the physical properties of the latter and the amount of gaseous hydrocarbons in the country rocks. Evidence has been obtained of a subvertical migration of hydrocarbon gases through dolerites. Thus the presence of intrusive traps is not a significant obstacle to the geochemical search for oil and gas. The increased content of hydrocarbon gases, especially homologs of methane in dolerites, and their regular distribution may be used in assessing oil-gas prospects in local structures.
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