Effects of pollutants on marine organisms : deliberations and recommendations of the NSF/IDOE Effects of Pollutants on Marine Organisms Workshop, held in Sidney, British Columbia, August 11-14, 1974 effectsofpolluta00nsfi Year: 1976? Figure 1 shows the distribution of relative ethane concentrations (where the total open ocean surface values of Co hydrocarbons are set equal to one) around a group of platforms located off the central Louisiana coast. All saturated Co to Cg hydrocarbons, which are cer- tainly petrogenic, as well as methane, which may also be formed biologically, showed approxim
Effects of pollutants on marine organisms : deliberations and recommendations of the NSF/IDOE Effects of Pollutants on Marine Organisms Workshop, held in Sidney, British Columbia, August 11-14, 1974 effectsofpolluta00nsfi Year: 1976? Figure 1 shows the distribution of relative ethane concentrations (where the total open ocean surface values of Co hydrocarbons are set equal to one) around a group of platforms located off the central Louisiana coast. All saturated Co to Cg hydrocarbons, which are cer- tainly petrogenic, as well as methane, which may also be formed biologically, showed approximately the same relative concentrations. The highest values, 85,000 times open ocean values or about ml of ethane per liter of sea water, were found near what appeared to be an underwater 'flare.' This phenomenon, a large volume of gas bubbling to the surface at one spot next to one platform, covered an area of several hundred square feet. This technique of disposing of gas appears to be a common one. High hydrocarbon levels, apparently from this one source, were observed in the surface water over an area greater than 25 square miles. This location was visited three times in four months with no apparent change in the appearance of this 'flare' or the high levels of hydrocarbons in the surrounding water column. On two subsequent cruises, four other flares were found, indicating Figure 1. Relative ethane concentrations (1 —3 X 10-^ ml of dissolved ethane at per liter of sea water) at 28°50'N 92°00'W. Solid squares are locations of platforms; solid circles are exposed well heads. 14
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