Oil spills during offshore operations are likely to cause severe contamination of the sea. The identification of the environmental effects of accidental releases from offshore oil and gas facilities plays a crucial role in the prevention and mitigation of marine pollution. Key Performance Indicators (KPIs) are largely recognized as an effective tool to address and communicate multifaceted issues related to accidental events in the framework of risk management. In the context of Oil Spill Risk Assessment (OSRA) studies, this study proposes a set of KPIs addressing the potential environmental contamination caused by on-surface oil spills from offshore oil and gas installations. A layered approach was defined, based on three different levels of KPIs having an increasing complexity and providing an increasing amount of information. The environmental KPIs defined allow a preliminary quantitative assessment of the environmental contamination due to the oil spill scenarios defined in the ENVironmental hazards IDentification (ENVID) studies carried out for oil and gas installations, providing a preliminary ranking of the expected environmental effects of the spills and supporting their prioritization in order to select those which should undergo a more accurate Environmental Risk Assessment study (ERA).

海上作业期间的石油泄漏很可能对海洋造成严重污染。确定海上石油和天然气设施意外泄漏的环境影响在预防和减轻海洋污染方面起着至关重要的作用。关键绩效指标 (KPI) 在很大程度上被认为是在风险管理框架中解决和传达与意外事件相关的多方面问题的有效工具。在石油泄漏风险评估 (OSRA) 研究的背景下，本研究提出了一套 KPI，以解决海上石油和天然气装置的地表石油泄漏造成的潜在环境污染问题。基于三个不同级别的 KPI 定义了一种分层方法，这些 KPI 具有越来越高的复杂性并提供越来越多的信息。