Ressursregnskapet per 31.12.1999 (kun engelsk)


The Norwegian Petroleum Directorate's (NPD's) resource account gives an overview of the recoverable petroleum resources on the Norwegian continental shelf. Recoverable petroleum resources comprise both the original marketable and the remaining petroleum resources. The resource estimates are based on reports submitted annually by the operating companies, NPD evaluations for fields and discoveries, and NPD estimates of undiscovered resources. Resources on the Norwegian continental shelf are classified in a system according to profitability and maturity, see the resource classification system.


Resources in Fields
As of 31 December 1999, 60 fields were approved for development on the Norwegian continental shelf. Of these, 46 fields were in production, 10 fields have ceased production, and 4 had approved development plans but had not yet started production. Eight new fields started production in 1999, Balder, Borg, Gullfaks Sør, Jotun, Oseberg Øst, Rimfaks, and Visund in the North Sea and Åsgard on Haltenbanken. The original recoverable reserves (classes 0-2) comprise 3 791 million Sm3 of oil (including NGL and Condensate) and 1 873 billion Sm3 of gas. Of these developed reserves, 55% of the oil (including condensate and NGL) and 33% of the gas have been produced for sale.

Oil resources from planned projects (classes 3-6) in fields are expected to correspond to approximately one year of current oil production.

The changes since 1998 in the total resources on the Norwegian shelf are small. The oil resources have decreased with approximately 103 million Sm3. Including oil, NGL and condensate total liquids have increased with approximately 17 million Sm3. The corresponding figure for gas is approximately 73 billion Sm3. The changes in the resource classes are mainly due to the dynamics of the classification system, that is; increases in classes 1-2 are due to new fields being approved for development. This is consequently reflected in class 3, which has experienced a major decrease in resources since 1998. Only minor changes are caused by changes in resources for the individual fields and discoveries, but overall there has been a minor decrease in oil resources in many of the fields.

The potential of possible future measures for increased recovery constitutes approximately 500 million Sm3 of oil and 500 billion Sm3 of gas and remains unchanged since 1998.

Resources in Discoveries
There are a total of 127 discoveries which have not yet been approved for development (classes 3-7) and 51 discoveries for which resources are reported under other fields or discoveries.

There were reported 5 new discoveries in 1999. They represent approximately 45-60 million Sm3 of oil (including condensate and NGL), and 55-80 billion Sm3 of gas. A major part of the new discoveries are under evaluation and there is considerable uncertainty in the estimates.

The total recoverable resources in discoveries have been estimated to 658 million Sm3 of oil (included NGL and condensate) and 1 145 billion Sm3 of gas. The discoveries represent 14% of the total oil resources and 17 % of the total gas resources.

Undiscovered Resources
The undiscovered resources have an expected value of 1 300-1 400 million Sm3 of oil and approximately 1 300 billion Sm3 of gas with an uncertainty range of as much as two to seven billion Sm3 o.e. The changes since 1998 are minor, the numbers have been adjusted in accordance to new discoveries.

The petroleum resource data that forms the basis of this article and the graphs within, are available for downloading. If utilized, please refer to the Norwegian Petroleum Directorate as the source.