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Title: Estudo geoquímico, toxicológico e ecológico do sedimento nas proximidades de um poço de perfuração na Bacia de Campos, Rio de Janeiro, Brasil
Keywords: Tríade da qualidade de sedimento;  Perfuração;  Licenciamento ambiental;  Sediment Quality Triad;  Drilling activity;  Environmental licensing
Issue Date: 28-Apr-2010
Abstract: The waste generated from drilling activity (fluids and cuttings) must be known and monitored in order to understand the environmental issue of offshore activities like production and exploitation of oil and gas. Assessing the quality of sediments is essential for understanding the processes that control the availability and disposal of contaminants in the marine environment, since it is the preferred compartment for storage and processing of most pollutants released by humans. The sediment surface surrounding the BJ-B was characterized by a predominance of fine sediments, mainly silt, in all stations sampled. Of the eleven metals analyzed, two (mercury and cadmium) were not detected in the sediment of all stations in the two campaigns in the BJ-B. The levels of most metals found in the sediment during this monitoring can be considered normal for the region studied. Only the nickel content showed higher values than the TEL established by NOAA in all seasons and zinc after drilling. All tests carried out showed that the hydrocarbons effectively the area where it was performed the drilling of the BJ-B, was already changed, especially in a 500m radius of the well, even before we started the drilling of the BJ-B. The decision matrix of the Sediment Quality Triad generated for this study presented an overview for each sample point. It was also observed with the evaluation and comparison of nine studies in the Campos Basin, that shows discrepancy in the way of evaluated and the number of parameters analyzed required by IBAMA in a licensing process. The Sediment Quality Triad is proposed as a tool for monitoring studies and may be used even by the environmental agency, showing through their lines a picture of each sampling station and how it behaved with the drilling activity.
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