Russia plans in coming months to call for international tenders covering joint venture development of two oil fields and one oil and gas/condensate field in western Siberia (see map at left).
None has seen extensive drilling. Here are details on the fields:
NORTH PRIOB
North Priob field is in the Khanti-Mansi autonomous district of the Tyumen region, one of the most industrially developed oil producing areas of western Siberia.
The field is 65 km east of the city of Khanti-Mansiysk and 100 km west of the city of Nefteyugansk. It is 125 km from the nearest railway station, Salim, and 80 km from the the nearest crude oil main line, Kholmogori-Klin.
Among the nearest major producing fields are Salim, 20 km to the east, and Pravdin, 57 km to the southeast. The Ob River divides Priob field into northern and southern parts.
Oil pays are concentrated in Cretaceous and Jurassic zones at 2,2003,100 m. Porosity is as much as 19%, permeability 40 md. Pay thickness ranges to as much as 11 m. Oil has a low viscosity-1.4 cp in situ.
Proved and probable reserves as of last Jan. I were estimated at 1.7 billion metric tons of oil in the northern part of the field. An increase is believed possible if development moves toward Studenoye field.
SALIM
Salim field also is in the Khanti-Mansi autonomous district of the Tyumen region. About 70% of the field lies in the Nefteyugansk subdistrict, while the remainder is in the Surgut and Khanti-Mansi subdistricts.
The field is 95 km southwest of Surgut, 90 km east of Khanti-Mansiysk, and 69 km southwest of Nefteyugansk.
The Urengoi-Novopolock gas pipeline and Ust-Balik-Omsk oil pipeline run south of the field. A 40 km crude oil line ties Salim field into the Ust-Balik-Omsk pipeline.
Oil reservoirs are in the Cretaceous and Jurassic Bazhenovskaya suite at 2,200-3,100 m. Cretaceous reservoirs, as thick as 6 m, have as much as 18% porosity and 65 md permeability.
Average well gauge is 6 metric tons/day (44 b/d), but some wells have yielded as much as 1,000 metric tons/day (7,300 b/d). Oil viscosity is as much as 1.3 cp, sulfur content 0.8%, and paraffin content 4.2%.
A Russian estimate places proved, probable, and possible reserves at 1.9 billion metric tons, including 1 billion metric tons probable, as of last Jan. 1.
Limited production has taken place since 1974. With 40 wells drilled, cumulative production is 2.8 million metric tons.
NOVOPORTOV
Novoportov field lies in the Yamalo-Nenecki autonomous district of the Tyumen region in the southeast part of the Yamal Peninsula. On the left bank of Ob Bay, the field is 15 km northeast of the Novi Port settlement and 300 km northeast of the city of Salekhard.
About 300 km northeast of Novoportov field lies giant Bovanenkov gas/condensate field, while Yamburg gas field and a railroad are 120 km east of Novoportov.
Novoportov is an oil and gas/condensate field with Cretaceous and Jurassic pay zones at 1,800-2,000 m. Pay thicknesses are as much as 20 m.
Porosity ranges to 22%, permeability 77 md. Oil viscosity ranges to 9 cp, sulfur content 0.1%, and paraffin 3.5%.
Russian data peg proved, probable, and possible oil reserves at 760 million metric tons, including 690 million metric tons probable. Proved and probable gas reserves are listed at 211 billion cu m. Proved and probable condensate reserves are 16 million metric tons.
Winner of the Novoportov tender will have an opportunity to take part in other future tenders for exploration, development, and production on the Yamal Peninsula and in adjoining areas of the Kara Sea.
Copyright 1992 Oil & Gas Journal. All Rights Reserved.
