Oil Spill Occurrence Rates for Alaska North Slope Crude and Refined Oil Spills.

摘要

The analysis presented here uses data about onshore and nearshore crude and refined oil spills larger than one barrel from Alaska North Slope oil and gas infrastructure to develop statistically valid occurrence estimators. The analysis is based on data compiled from seven datasets, all drawn from the Alaska North Slope. The final dataset of 1,577 spills larger than one barrel from June 1971 September 2011 includes information about the number and volume of the spills, as well as the associated oil field, attributed cause, facility type, and petroleum substance spilled. More than 80% of the spills were between 1 10 bbl, while there were 10 spills larger than 500 bbl and two spills larger than 1,000 bbl. For the development of occurrence estimators, a slightly smaller spill dataset was used. Data from before 1980 were removed due to uncertainties about their reliability (it is believed that reporting procedures changed significantly during the first decade of operations). Additionally, data from the first nine months of 2011 were excluded because the full years data was not available, and annual spill rates that were being modeled.