The 2003 year end reserves reporting of Canadian oil and gas companies over the first quarter of 2004 seems to have been dominated by the significant influence of the newly implemented Canadian Securities Administrators (CSA) regulations as prescribed by the recently introduced National Instrument (NI) 51–101. Many of the large Canadian senior issuers have obtained exemptions from certain aspects of NI 51–101 to report under the U.S. Securities and Exchange Commission (SEC) regulations nevertheless we still hear of references to NI 51–101 apparently negatively influencing reported results. Even though the Canadian Oil and Gas Evaluation Handbook (COGEH - the reference source for the definition of proved reserves under NI 51–101) states that differences with SEC for proved reserve estimates (based on constant prices) should not be material, at least one large independent referred to a more conservative methodology now being used by outside advisors which apparently had a negative impact on their reserve estimates.

Almost no reserve estimates in Western Canada are prepared using probabilistic methods and so references to certain probability levels in COGEH, particularly by those not closely involved with evaluating reserves, suggest a lack of understanding of both the written regulations and their application. This paper therefore revisits the SEC and NI 51–101 reserve definitions and discusses the level of uncertainty inherent in reserve estimates in the context of current industry practice. The aggregation effect is discussed using a typical Western Canada portfolio example. Guidelines are discussed for classifying proved reserves under both definitions and a practical approach is recommended for estimating proved reserves at the entity level which satisfies both SEC and NI 51–101 regulations.

Undoubtedly industry practices in estimating reserves are changing under the influence of an increasingly vigilant regulatory environment in both the U.S. and Canada. It is therefore essential for practicing reserve evaluators to be fully involved in shaping practical approaches to satisfying legal reserve disclosure requirements.


The world of reserves reporting has changed significantly in the last year or so as corporate governance has come under increasing regulatory vigilance. The passing of the Sarbanes- Oxley Act in the U.S. in July 2002 following the Enron meltdown and the implementation of NI 51–101 in Canada in September 2003, following several well publicized reserve write-downs and bankruptcies, have resulted in unprecedented scrutiny regarding the evaluation and disclosure of reserves. There have been several large write-downs reported on both sides of the border as well as by Shell in Europe in the first quarter of 2004. Is this because the regulations have materially changed or is it because there is now a perception that the guidelines are now being more strongly enforced? This paper attempts to assess the former in the context of large Canadian independents.

For U.S. public companies reserve disclosures have to comply with the SEC regulations, which have not changed since 1987 (Reference 1). For Canadian public companies engaged in oil and gas activities reserve disclosures have to now follow the NI 51–101 regulations that were finalized in September 2003 (Reference 2).

This content is only available via PDF.
You can access this article if you purchase or spend a download.