Gazprom and BASF's Wintershall unit agreed on the terms to swap assets in the North Sea and a western Siberian deposit.
Gazprom plans to get 50 percent of oil and gas fields in the southern part of the North Sea, the gas producer said Friday. Wintershall will get 25 percent plus one share in blocks 4 and 5 of the Achimov formation in the Urengoi field.
Wintershall has an option to raise its stake in the Achimov blocks to 50 percent, the German company said. The North Sea blocks are in Dutch and British waters.
In Russia, the companies produce gas at the Yuzhno-Russkoye gas field in Siberia and are developing area 1A of the Achimov layers of the Urengoi field.
Gazprom also held talks with Tokyo Electric Power Company and Japan's two largest trading houses on fuel supply and the Russian company's participation in Japanese power projects.
Gazprom deputy chief executive Alexander Medvedev met with officials of Tepco, as the utility is known, and of Mitsubishi and Mitsui in Tokyo, Gazprom said in a statement on its web site Thursday.