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Oil and Natural Gas Reserves

Estimated net proved reserves at December 31, 2013 amounted to 6.54 bboe based on a reference Brent price of $108 per barrel. The organic reserves replacement ratio was 105% with a reserves life index of 11.1 years (11.5 years in 2012).


  • Proved Reserves Proved Reserves
  • Proved undeveloped reserves Proved undeveloped reserves

Eni’s estimated proved reserves were determined taking into account Eni’s share of proved reserves of equity-accounted entities. Movements in Eni’s 2013 estimated proved reserves were as follows:

Additions to proved reserves booked in 2013 were 621 mmboe and derived from:

  • revisions of previous estimates were up 508 mmboe mainly reported in Congo, Iraq, Australia and Nigeria;
  • extensions, discoveries and other factors were 108 mmboe, with major increases booked in Angola, Indonesia and the United States;
  • improved recovery were 5 mmboe reported particularly in Nigeria.

Price effects were negligible, leading to an upward revision of 14 mmboe, due to a lowered Brent price used in the reserve estimation process down to $108 per barrel in 2013 compared to $111 per barrel in 2012.
Sales of mineral-in-place related to the divestment of assets in Russia (652 mmboe) and the United Kingdom (13 mmboe).

Acquisitions referred to interests in assets located in Egypt (4 mmboe).
In 2013 Eni achieved an organic reserves replacement ratio5 of 105%. Reserves life index was 11.1 years (11.5 years in 2012).

Proved undeveloped reserves as of December 31, 2013 totalled 3,108 mmboe, of which 1,361 mmboe of liquids mainly concentrated in Africa and Kazakhstan and 9,592 bcf of natural gas mainly located in Africa and Venezuela. Proved undeveloped reserves of consolidated subsidiaries amounted to 1,248 mmbbl of liquids and 5,900 bcf of natural gas.

In 2013, total proved undeveloped reserves decreased by 542 mmboe due to disposal made in Russia as well as upwards and downwards revisions related to contractual and technical review.
During 2013, Eni converted 337 mmboe of proved undeveloped reserves to proved developed reserves due to development activities, production start-ups and revisions. The main reclassifications to proved developed reserves are related to the following fields/projects: Kashagan (Kazakhstan), CAFC-MLE and Block 208 (Algeria), Jasmine (United Kingdom) and Zubair (Iraq).

In 2013, capital expenditure amounted to approximately €2 billion and was made to progress the development of proved undeveloped reserves.

Reserves that remain proved undeveloped for five or more years are a result of several physical factors that affect the timing of the projects development and execution, such as the complex nature of the development project in adverse and remote locations, physical limitations of infrastructures or plant capacity and contractual limitations that establish production levels. The Company estimates that approximately 0.8 bboe of proved undeveloped reserves have remained undeveloped for five years or more with respect to the balance sheet date, mainly related to:

  • the Kashagan project in Kazhakstan (0.4 bboe) residual after the start-up of Phase 1 development (Experimental Program) following the completion of the facilities and the drilling campaign (for more details regarding this project please refer to "Main exploration and development projects-Kashagan");
  • some Libyan gas fields (0.3 bboe) where development completion and production start-up are planned according to the delivery obligations set forth in a long-term gas supply agreement currently in force. In order to secure fulfilment of the contractual delivery quantities, Eni will implement phased production start-up from the relevant fields, which are expected to be put in production over the next several years; and
  • other minor projects where development activities are progressing.

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Last updated on 22/05/14