Hydraulic fracturing (fracking) techniques can be used to recover natural gas as well as oil buried in shale underground deposits.

  1. A well is drilled and extended horizontally.

  2. Explosives fracture the rock.

  3. Hydraulic pressure is applied to the fractures.

  4. Escaping gas is collected.

Side effects of shale gas and shale oil recovery may include contamination of soil and groundwater.