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Volume 67, Issue 8, August 2014

cover: Enormous quantities of natural gas and oil lie below ground, trapped in low-permeability shale formations. To extract those resources, energy producers pump large volumes of water into the shale to create networks of fractures, somewhat fancifully depicted in this photomontage. The fossil fuels then migrate through the fracture networks to the reservoirs from which they are extracted. To learn more about the process, turn to the article by Donald Turcotte, Eldridge Moores, and John Rundle on page 34. (Source images from the US Department of Energy and the US Geological Survey.)

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Scitation: Physics Today - Print edition
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