Gazprom said the discussions focused on the Bolshekhetskaya deposit near the Kara Sea and on deposits in the Caspian region.
Lukoil in a 2008 annual report estimated the so-called Bolshekhetskaya Depression was producing around 790 billion cubic feet of natural gas per year. The company said it agreed to deliver some of that gas to a regional compressor station that's part of Gazprom's transit network.
Gazprom said its strategic agreement with Lukoil outlines work in north Russia near the Yamal-Nenets autonomous region as well as the Russian sector of the Caspian Sea.
The Caspian Sea has some of the richest deposits of oil and natural gas.