API Publ 4717 pdf download.PREDICTORS OF WATER-SOLUBLE ORGANICS (WSOs) IN PRODUCED WATER—A LITERATURE REVIEW 2 Chemical Composition of Produced Water 2.1 ORIGINS OF PRODUCED WATER During millions of years of geologic time, petroleum and natural gas may accumulate in porous sediments (e.g., sands) trapped between layers of impermeable rock deep within the earth (Collins, 1975). Water may be trapped during...