To estimate the methane flux from natural gas bubble streams (seepages), a combined approach including a detailed echo survey of the investigated area and the data analysis with the use of specialized software, GIS technique, and mathematic simulation is applied. A precise location map of methane seepages in the Dnieper paleodelta region is obtained. In total, 2200 seepages were identified on the investigated area of 387,1 <$E roman km sup 2>. They release <$E 16,74~cdot~10 sup 6~roman m sup 3> at the atmospheric pressure (STP) or <$E 12,0~cdot~10 sup -3> teragram of methane a year. The statistical distribution of individual seepage methane flux rates conforms to the lognormal law. We found that 1,9 % of methane from gas bubble streams reaches the atmosphere in the gas phase, while 98,1 % dissolves in the water column. Thus, the most part of methane remains in sea water and enters into the physical, chemical, and biological transformation processes of carbon-containing compounds.

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