"Produced water is water trapped in underground formations that is brought to the surface along with oil or gas.Because it has been in contact with the hydrocarbon-bearing formation for centuries,it contains some of the chemical characteristics of the formation and the hydrocarbon itself.It may include water from the reservoir,water injected into the formation,and any chemicals added during the production and treatment processes.Produced water is also called brine’and’formation water’The major constituents of concern are: salt content measured(salinity,total dissolved solids,electrical conductivity),oil and grease(a measure of organic chemical content),various natural inorganic and organic compounds or chemical additives,and natural occurring radioactive materials(NORM).”U.S.Department of Energy,Water Issues Dominate Oil & Gas Production(Fall 2013).
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