Geological Conditions of Gas Accumulation in the Coastal–Shelf Zone of the Peter the Great Bay, Sea of Japan

The results of the study of natural gas in Peter the Great Bay from 2009 to 2014 are reported. The data on the distribution of natural gas in the water and bottom sediments are obtained. High concentrations of gas in the bottom water and sediments are registered in some areas of the bay. The probable sources of methane and other natural gases are suggested.