Mark P.Mills writes at Forbes:
Drilling into conventional sources is like sticking a straw in a jelly donut – the petroleum is trapped in a large single formation that just flows out under pressure. Drilling into unconventional sources like oil and gas shale is quite different, more like tiramisu – the petroleum is in many layers that have to be individually tapped using horizontal drilling and fracking methods to open up the rock. Saudi Arabia has a bunch of really big jelly donuts. The United States has lots of tiramisu, plus some pretty good jelly donuts as well...
[D]evelopment of mature fracking technologies for oil and gas shale that have made previously uneconomic reserves economic, and development of other unconventional sources like tar sands and heavy oils.
(Via OilPrice.com) |
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