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Natural Gas in the U.S.: How Far Can Technology Stretch the Resource Base?

Cutler J. Cleveland and Robert K. Kaufmann

Year: 1997
Volume: Volume18
Number: Number 2
DOI: 10.5547/ISSN0195-6574-EJ-Vol18-No2-5
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We review the theoretical underpinnings of the exponential model, the amount of gas discovered per unit effort, a quantity called yield-per-effort (YPE), and estimate an econometric model that represents the historical determinants of the YPE for nonassociated gas discoveries in the lower 48 states from 1943 to 1991, the entire period for which the requisite data are available. Results indicate the YPE declines as the exponential function of cumulative drilling when short run changes in drilling effort, real gas prices, and shifts between onshore and offshore are accounted for. We explicitly test and reject the hypothesis that technological change has arrested or reversed the long run decline in YPE. We also discuss some alternative models of YPE that misrepresent the interplay of depletion and technical innovation, as well as the process of innovation itself, and the statistical and methodological shortcomings of the empirical analyses used to support several alternative models of YPE.

Oil Production in the Lower 48 States: Economic, Geological, and Institutional Determinants

Robert K. Kaufmann and Cutler J. Cleveland

Year: 2001
Volume: Volume22
Number: Number 1
DOI: 10.5547/ISSN0195-6574-EJ-Vol22-No1-2
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In this paper, we establish an empirical model for oil production in the lower 48 states that represents its economic, physical, and institutional determinants. We estimate a vector error correction model for oil production in the lower 48 states that specifies real oil prices, average production costs, and prorationing by the Texas Railroad Commission. These modifications enable us to generate a model that accounts for most of the variation in oil production in the lower 48 states between 1938 and 1991. The result that oil production in the lower 48 states shares stochastic trends with real oil prices, average production costs, and prorationing indicates that accuracy of Hubbert's bell shaped curve is fortuitous. The importance of these factors also indicates why the basic Hotelling model cannot replicate the production path for oil in the lower 48 states. This inability is critical. The negative economic effects associated with high prices and energy shortages imply that the importance of inconsistencies with the basic Hotelling model identified by this analysis may be sufficient to warrant a greater degree of government intervention in the transition from oil than is currently envisioned by most policy makers.

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