Abstract
A growing number of commentators are forecasting a near-term peak and subsequent terminal decline in the global production of conventional oil as a result of the physical depletion of the resource. These forecasts frequently rely on the estimates of the ultimately recoverable resources (URR) of different regions, obtained through the use of curve-fitting to historical trends in discovery or production. Curve-fitting was originally pioneered by M. King Hubbert in the context of an earlier debate about the future of the US oil production. However, despite their widespread use, curve-fitting techniques remain the subject of considerable controversy. This article classifies and explains these techniques and identifies both their relative suitability in different circumstances and the level of confidence that may be placed in their results. This article discusses the interpretation and importance of the URR estimates, indicates the relationship between curve fitting and other methods of estimating the URR and classifies the techniques into three groups. It then investigates each group in turn, indicating their historical origins, contemporary application and major strengths and weaknesses. The article then uses illustrative data from a number of oil-producing regions to assess whether these techniques produce consistent results as well as highlight some of the statistical issues raised and suggesting how they may be addressed. The article concludes that the applicability of curve-fitting techniques is more limited than adherents claim and that the confidence bounds on the results are wider than usually assumed.
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Notes
These involve selecting and parameterising a mathematical function that has the ‘best’ statistical fit to a set of data points, possibly subject to constraints.
Hubbert’s original curve was hand drawn, but his later articles used more formal techniques.
If the discovery rate was constant and if fields were discovered precisely in the descending order of size, the field-rank and discovery projection techniques would be identical. But the advantage of discovery projection is that it does not require data on individual fields.
Exploration is very rarely unrestricted in aggregate regions. For example, the US imposes far fewer restrictions than most countries, but the Arctic National Wildlife Refuge, the eastern Gulf of Mexico, much of the western offshore and many onshore areas in the Rockies are off-limits for environmental reasons (Mills, 2008).
Non-linear regression is straightforward with modern computer technology, but the earlier literature uses simpler methods such as the linear transformation of the functional form followed by a linear regression (Hubbert, 1982). If the production or discovery cycle is well advanced, then it is possible to estimate the URR through visual identification of the asymptote to which the curve is trending (Bentley, 2009).
Hubbert (1982) begins with an assumed parabolic relationship between production and cumulative production and uses this to derive a logistic equation for cumulative production over time. However, this formal derivation came more than 20 years after he first referred to the logistic model (Hubbert, 1959; Sorrell and Speirs, 2009).
Wiorkowski (1981) compared a ‘Generalized Richards’ model (which can take an exponential, logistic, or Gompertz form depending on the parameters chosen) with a cumulative Weibull and found that they fit the US cumulative production data equally well but led to significantly different URR estimates (445 and 235 Gb, respectively).
Cleveland and Kaufmann (1991) fitted a logistic curve to the US production data through to 1988 and found that the adjusted R 2 changed only from 0.9880 to 0.9909 as the value of the URR varied from 160 to 250 billion barrels.
‘…Because petroleum exploration in the US began very early, because the initial exploration and discoveries occurred in what has proved to be relatively minor basins, because early drilling technology was very limited in its drilling depth capabilities, and because discoveries in the major basins only hit their stride between 1910 in 1950, the US comes closest to a symmetric discovery curve of any major oil producing country or region’ (Nehring, 2006a, b, c).
Including the cumulative length of exploratory drilling (Hubbert, 1967), the total number of exploratory wells (Ryan, 1973), the number of successful exploratory wells (Moore, 1962), the cumulative length of successful exploratory wells (Stitt, 1982) or the cumulative length of all wells (i.e. both exploratory and development) (Cleveland, 1992). A distinction may also be made between the first exploratory well to be drilled (‘new field wildcats’ or NFWs) and subsequent wells.
Laherrère (2004a, b) states that the creaming curve was invented by Shell in the 1980s, but variants of this approach have been used in the oil industry for much longer period (Arps and Roberts, 1958; Arps and others, 1971; Odell and Rosing, 1980; Harbaugh and others, 1995). Two employees of Shell published a paper on ‘the creaming method’ in 1981, but this describes a highly sophisticated (and not widely used) discovery process model that relies on Monte Carlo simulation of trends in both success rates and average field sizes and assumes a lognormal field size distribution (Meisner and Demirmen, 1981).
The IEA (2008) reports that, over the last 50 years, the global average success rate has increased from one in six exploratory wells to one in three. Similarly, Lynch (2002) reports that the average success rate in the US increased by 50% between 1992 and 2002 and Forbes and Zampelli (2000) report that the US offshore success rate doubled between 1978 and 1995. In an econometric analysis, Forbes and Zampelli (2000) estimate that, over the period of 1986–1995, technological progress increased the US offshore success rate by 8.3%/year.
The names of the regions are withheld due to data confidentiality.
Goodness of fit was measured using simple R 2. However, we recognise that this is not the best measure to use when comparing ‘non-nested’ models, such as a logistic versus a Gompertz (Kennedy, 2003).
For example, between 1957 and 1968, the ‘prorationing’ decisions of the Texas Railroad Commission shut in more than 50% of Texan oil-producing capacity.
A notable exception is Dées and others (2007).
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Acknowledgments
This article is based on a comprehensive review of the curve-fitting literature by Sorrell and Speirs (2009) which in turn formed part of wide-ranging study of global oil depletion by the UK Energy Research Centre (Sorrell and others, 2009). The authors would like to thank the UK Research Councils for their financial support, IHS Energy for allowing the publication of data from their PEPS database, Fabiana Gordon for her help on statistical issues, and Roger Bentley, Richard Miller, Jean Laherrère and Robert Kaufmann for their helpful comments on earlier drafts. The usual disclaimers apply.
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Sorrell, S., Speirs, J. Hubbert’s Legacy: A Review of Curve-Fitting Methods to Estimate Ultimately Recoverable Resources. Nat Resour Res 19, 209–230 (2010). https://doi.org/10.1007/s11053-010-9123-z
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DOI: https://doi.org/10.1007/s11053-010-9123-z