Shale gas will not affect underground drinking water safety

 Technical difficulties  shale gas  breakthrough after, not completely non-existent risks. Internationally, the U.S. shale gas development for the earliest and most experienced. But in the commercial exploitation bring great benefits, but also some people believe that the  Hydraulic fracturing   hydraulic fracturing through the wells into the rock fracturing, resulting in high conductivity fracture channel, and then injected into the  Proppant  (mainly  frac sand   shore cracks, this process will not cause fracturing fluid chemicals in groundwater and shale gas mixed with it
Most hydraulic fracturing is much deeper than the aquifer (several kilometers) of rock carried out, and the design of multiple oil and gas wells to drinking water and protective measures to isolate the area of   oil and gas production, shale oil and gas exploration does not affect the safety of drinking water to the underground.
U.S. shale gas development in the practice of the problems, but also for China's shale gas such latecomer countries provided can learn from. Currently the United States has for the control of environmental pollution caused by shale gas promulgated regulations, believe that if there is a reasonable regulatory regime, with the concomitant occurrence of shale gas development environmental risks can be controlled.
According to the China University of Geosciences Professor Professor Hou Dujie introduction, generally a shale gas well fracturing water required 10,000 m3, and about 35% of fracturing fluids and formation water will flow back to the ground, so the improper disposal of flowback also contaminate surface water. These are usually two flowback more environmentally approach: recycled or discharged after treatment.