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Existing exploration–discovery models are generally characterised by equations describing the behaviour of exploration, success rates, and discoveries. The present paper adds two equations describing the behaviour of finding costs and exploration efficiency. The model was disaggregated along regional lines. Applying the model to UK Continental Shelf data over the period 1964–2002 produced results that supported the new approach. Analysis of the model dynamics and simulation forecast reveals similarities, but also important differences in the responsiveness of activity in the regions to policy multipliers, implying that uniform policy instruments will produce unequal responses in areas with different levels of maturity.

The petroleum supply process takes place in stages. Decisions at any stage are based on information obtained at the preceding stage. The present paper develops an econometric model incorporating the feedback structure of the process. The model framework consists of a system of simultaneous equations. Using UKCS data the model was estimated, tested for stability and predictive power, and used to conduct a structural analysis, investigating the effects of market conditions on activity levels in a mature hydrocarbon province. The results provide useful insights into the feedback nature of the petroleum supply process and the importance of market conditions to continued activity levels in a mature province.

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