II. ENVIRONMENTAL IMPACTS AND RISKS EVALUATION OF OFFSHORE DRILLING
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Figure 24: Main contribution of life cycle processes on Human Health risk
II.3.5 Human toxicity contribution scores of toxic substances emitted from drilling fluid
losses
By refining the analysis, it is possible to identify the substances emitted locally from fluid losses
during the drilling of the various sections of the well. It can be seen that polycyclic aromatic
hydrocarbons PAH has the greatest contribution in human toxicity, followed by arsenic and
barium and this, for all sections of the well. According to the life cycle impact analysis model
integrated into LCA methods, human toxicity is assessed by taking into account the chemical
fate of the substance emitted in the environmental compartment in question (here, it is the
column d water and marine sediments) as well as its toxic effect.
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61
Figure 24: Main contribution of life cycle processes on Human Health risk
II.3.5 Human toxicity contribution scores of toxic substances emitted from drilling fluid
losses
By refining the analysis, it is possible to identify the substances emitted locally from fluid losses
during the drilling of the various sections of the well. It can be seen that polycyclic aromatic
hydrocarbons PAH has the greatest contribution in human toxicity, followed by arsenic and
barium and this, for all sections of the well. According to the life cycle impact analysis model
integrated into LCA methods, human toxicity is assessed by taking into account the chemical
fate of the substance emitted in the environmental compartment in question (here, it is the
column d water and marine sediments) as well as its toxic effect.