Data from A plotted on logarithmic scales with a fractal curve fit to field sizes above the limit of economic perceptibility and extrapolated to smaller field sizes. Regions of discovered and undiscovered hydrocarbon fields greater than 0.1 mmBOE are shaded below the fractal curve .
This USGS Fact Sheet can be found at <URL:http://energy.usgs.gov/factsheets/HydroRes/fig3.html>
Maintained by L. Friedrich Last updated 24-Sept-1997