抄録
21st century is considered as an era of natural gas. The reasons of this could be derived from its efficiency, environmental advantages and new technological development such as micro gas turbine, gas-combined cyclic power generator etc. In Japan, however until now, natural gas resources have been limitedly utilized for electric power generation by import of LNG. It is known that Russian federation may contain the world largest gas resources at the present time and the future. In particular, substantial gas potential is highly expected in the eastern Siberia and the Far East region. Due to insufficient infrastructures from the existing gas fields to potential market, these fields have not been fully developed. For the future strategy of energy supply to Japanese market, these gas resources could be one of important candidates. In this paper, the author summarizes the world gas demand and supply, and introduces the hydrocarbon systems of representative oil and gas fields of the region.