• French firm Perenco SA plans to buy a nonoperated 50% working interest (37.5% average net revenue interest) in Marine 1 permit offshore Congo for $62 million from Nuevo Energy Co., Houston (NYSE: NEV). • Teton Petroleum, Denver, (NYSE: TPE) will sell its 35% stake in the Goloil Siberian oil venture to an undisclosed buyer. Financial terms were not disclosed. Separately, Teton plans to buy a majority stake in a Russian oil field that has production of about 3,400 bbl. of oil per day, net. • Rio Alto Resources International Inc. has sold its 100% working interest in the Tiguino Block in Ecuador to an undisclosed buyer for US$9.3 million plus a positive working capital adjustment of $2 million.