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Main page Licensed Blocks in the Irkutsk Region and Evenkia
Licensed Blocks in the Irkutsk Region and Evenkia

Geological exploration in the southern part of Eastern Siberia (Irkutsk Region and Evenkia) also has great importance for the Company. Fields in this region should provide a large part of the oil to fill the Eastern Siberia – Pacific Ocean pipeline. Rosneft has licenses to 13 blocks in this region and another two licenses are held by a joint venture between Rosneft and the Chinese National Petroleum Corporation (CNPC).

A total of 3,839 linear km of 2D seismic exploration work was carried out at the Company’s license areas in Irkutsk Region in 2010, and four prospecting wells were drilled. Drilling led to discovery of one deposit and two new fields.

A prospecting and evaluation well, Mogdinskaya №7, was drilled at the Mogdinskaya license area and gave a gushing flow of commercial oil, representing discovery of a new oil deposit at Savostyanov field. A 550-meter horizontal sidetrack was drilled at well Mogdinskaya №6, which was completed in 2009, and testing gave a flow of strata water mixed with oil. C1 and C2 oil reserves of Savostyanov field (Russian classification) were increased by 36 mln tonnes (263 mln barrels), which is more than 20%.

Drilling of a prospecting and evaluation well at the Sinarsky license area, located 200 km from the Eastern Siberia – Pacific Ocean pipeline, also led to discovery of a new field, the Sanarskoye field. C1 and C2 recoverable reserves under Russian classification are estimated at 81.7 mln tonnes (598 mln barrels) of oil.

A prospecting and evaluation well drilled at the Preobrazhensky license area, located 120 km from the Eastern Siberia - Pacific Ocean pipeline, led to discovery of another new field, which has been named in honor of an outstanding representative of the Soviet oil industry, N.N. Lisovsky. Recoverable C1 and C2 reserves under Russian classification are estimated at 89.6 mln tonnes (655 mln barrels).

A prospecting and evaluation well, East-Sugdinskaya №2, was drilled at the East-Sugdinsky license area, but was closed down for geological reasons.

Exploration work continued in the reporting year at the Yurubcheno-Tokhomskoye field. Sidetracks with horizontal completion were drilled at two wells, which were drilled earlier but had not given commercial flows. Thanks to the sidetracks, gushing flows were obtained at both wells. Drilling of well Yurubchenskaya №83 was completed, ready for testing in 2011. Geological exploration work gave an increase of 17.3 mln tonnes (127 mln barrels) in C1 and C2 reserves (Russian classification) at the Yurubcheno-Tokhomskoye field in 2010.

LLC Vostok Energy, a joint venture between Rosneft and CNPC, drilled a prospecting and evaluation well, West-Chonskaya №1. The well has been temporarily mothballed pending hydrofracturing work, which is scheduled for 2011 in order to clarify the nature of saturation.