2. How is "unconventional gas" produced?
Exploiting unconventional hydrocarbon sources is fraught with technical and economic problems.
2.1 Producing shale or tight gas
What shale gas has in common with gas from compact reservoirs is that it is trapped in rock with very low permeability. They are therefore difficult to extract because, compared with gas from conventional reservoirs, the rock holding them has to be drained and given an artificial permeability.
When these gases are...
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How is "unconventional gas" produced?
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