The objective of the study is to examine hydrate formation conditions of methane-hydrogen sulfide mixtures providing the Black Sea conditions. An experimental work is carried out by using a system that contains a high-pressure hydrate formation cell with different H2S concentrations and both brine and distilled water. Hydrate equilibrium conditions, the number of moles of free gas in the hydrate formation cell, and rate of hydrate formation are determined. Effects of H2S concentration on the hydrate formation conditions are also obtained during the study. It is observed that with an increase in H2S concentration, the methane hydrogen sulfide hydrate formation conditions reach higher equilibrium temperature values at a given pressure. According to the experimental results, it is concluded that the Black Sea has suitable conditions for hydrate formation of methane hydrogen sulfide mixtures. © Copyright Taylor & Francis.