Shale is a relatively common and unique lithology that can form a complete hydrocarbon system where it can act as source, reservoir, and seal. The term “shales” classifies rocks based upon their grain size rather than on their mineralogy. For this reason alone, the variability evident across the different shale units is truly remarkable, as is their global extent within hydrocarbon systems. Hydrocarbon production from shale reservoirs requires creating artificial permeability channels through hydraulic fracturing. The business case for petrophysical, geophysical, and engineering studies highlighted in this special issue is strong because it has been shown repeatedly that better understanding...

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