SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Sealed gas well. A stoppered gas well in a shale gas area. Shale gas is normally extracted by fracking, a drilling technique used to extract gas and oil from deep rock formations such as shale deposits. A mixture of sand, chemicals and water is pumped under high pressure from the surface to underground horizontal wells. The pressure forms fissures (fractures) in the shale. The sand keeps the fissures open, allowing gas and fluids to flow into the well and rise to the surface. Fracking can cause small earthquakes (microseismic events), and there are concerns about effects on water tables. Photographed in the Yuzovka shale gas area, Ukraine.
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