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Reserves increased at Gazprom Neft’s Chona group of fields

Gazprom Neft has increased the boundaries of its Ignyalinsky license block in Eastern Siberia, with recoverable reserves at this asset increasing 10% as a result, to reach 76 million tonnes of oil.

The boundaries of the Ignyalinsky block were expanded through what is known as the “cut-in mechanism” (involving the addition of a piece of adjacent land comprising open acreage (land as yet unallocated under the State Subsoil Reserve Fund),* with this asset now increasing to 2,200 km2 in size.

The Ignyalinsky block, on which the eponymous field is located, forms part of the Chona group of fields.** Initial reserves in place (IIP) on the Chona project stand at 220 million tonnes of oil (mt). The profitable development of this asset has been complicated by its challenging geological structure and the extensive geographic spread of hydrocarbon deposits. Gazprom Neft has drilled three prospecting and appraisal and exploratory wells over the course of three years of investigations at Chona blocks, as well as undertaking extensive 3D seismic surveys and more than 3,000 km2 of electro-seismic investigations — a world record in this industry.

The Chona project includes the Ignyalinsky, Tympuchikansky and Vakunaysky license blocks, located on the border between the Irkutsk Oblast and the Sakha Republic (Yakutia). These assets are located 100 km from the East-Siberia Pacific Ocean (ESPO) pipeline. Total IRIP at fields on the Chona project stand at more than one billion tonnes of oil, and about 300 billion cubic metres (bcm) of gas.

“The Chona group of fields comprise Gazprom Neft’s anchor asset in Eastern Siberia. They are notable for their remoteness from major logistics centres and their complex reservoir structures, but also for their uniquely high production potential. We have gained a detailed understanding of the geological features of these blocks in recent years, and have put in place a strategy for developing them, confirming the commercial prospects for this project. All of which means we will shortly be able to being pilot development of the Chona fields, initial reserves in place of which stand at more than one billion tonnes of oil.”
Yuri Masalkin
Yuri Masalkin Director for Geological Prospecting and Resource Base Development, Gazprom Neft
Notes for editors

* The “cut in” mechanism was utilised by Gazprom Neft in expanding the boundaries of the Ignyalinskoye field. This envisages part of a field’s open-acreage reserves being allocated to a subsoil user by means of the boundaries of a block for which it already holds a license being adjusted, either in terms of total surface area or depth.

Since 2017 Gazprom Neft has used the same mechanism to expand the boundaries of the Gazpromneft-Noyabrskneftegaz Krainiy license block in the Yamalo-Nenets Autonomous Okrug, the Shinginsky and Archinsky fields in the Tomsk Oblast, the eastern block of the Orenburg oil and gas condensate field, the Filatovskoye and Tsarichanskoye fields, Orenburg, and the southern section of the Priobskoye field in the Khanty-Mansi Autonomous Okrug-Yugra.

** The Ignyalinskoye oil and gas condensate field covers the Katangsky district of the Irkutsk Oblast and the Lensky district of the Sakha Republic (Yakutia). The field was discovered in 2011, and put into pilot operation in 2016.

The first horizontal well was drilled at the Ignyalinskoye field in 2018, from which a commercial oil flow was obtained after multi-stage hydraulic fracturing. The first batch of oil from the Ignyalinsky block was delivered to the ESPO In February 2018.