Proven oil reserves not to change during the transition to the new classification.

Proven cost-effective oil and gas reserves will not undergo major changes due to the transition to the new classification system, the RF Minister of Natural Resources and Environmental Protection Sergey Donskoy informs.

"There will be changes, but in terms of the testing that we have conducted the changes are not large-scale, - he added. - First of all, they are connected with the fact that economic indicators are more tied to the current situation".