6
II.2 MATERIALS AND METHOD
II.2.1
Life Cycle Assessment methodology..........................................................47
II.2.2
Application of LCA to offshore exploration drilling……………………..49
II.2.2.1 Definition of the scope and objectives of the study……………………...49
II.2.2.2 Life Cycle Inventory Analysis....................................................................50
II.2.2.3 Environmental impacts and risks assessment.............................................55
II.3 ANALYSIS RESULTS AND DISCUSSIONS
II.3.1
Calculation of impact scores related to well sections……………………58
II.3.2
Calculation of well section damage and risk scores……………………..59
II.3.3
Contribution scores of well sections on the risk to human health……….59
II.3.4
Main contribution of life cycle processes on Human Health risk………..60
II.3.5
Human toxicity contribution scores of toxic substances emitted
from drilling fluid losses………………………………………………....61
II.3.6
Contribution scores of well sections on the risk to ecosystem quality….63
II.3.7
Marine ecotoxicity scores of toxic substances emitted from
drilling fluid losses……………………………………………………….64
II.3.8
Calculation of impact and damage scores of offshore drilling
waste treatments ………………………………………………………...65
II.3.9
Terrestrial ecotoxicity scores of toxic substances emitted
from drilling waste treatment…………………………………………...67
II.3.10
Environmental performance comparison of offshore
drilling scenarios.......................................................................................68
Conclusion and recommendations
REFERENCES
APPENDICES