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Defining Characteristics of Shale Gas and Shale Oil Plays

Estimated Range of Permeabilitie for Shale Plays versus Other Play Types
Estimated Gas-in-Place Per Sectio for Shale Plays versus Other Play Types
The next slide illustrates why horizontal drilling/multilateral fracking are essential in overcoming the trend towards reservoirs with lower permeabilities. One of the attributes that helps make shale gas plays economically viable is that the amount of gas contained within shales for a given area is frequently much higher than for other formation types. The higher densities are due to a combination of more gas per unit of reservoir volume and the greater thickness of the shales, which can be considerably thicker than other formation types. Similar to coals, gas in shales exists in both free form in pore spaces, and adsorbed on the organic particles in the shale matrix.