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Environmental Impact in Sediments and Seawater due to Discharges of Ba, 226Ra, 228Ra, V, Ni and Pb by Produced Water from the Bacia de Campos Oil Field Offshore Platforms

2002; Taylor & Francis; Volume: 3; Issue: 2 Linguagem: Inglês

10.1006/enfo.2002.0085

1527-5922

S Jerez Veguería,

Marine and Offshore Engineering Studies

Produced water samples from the Bacia de Campos oil field offshore Pargo andPampo platforms were analyzed for Ba, 226Ra, 228Ra, V, Ni and Pb. The activity concentrations measured were in the range of 1.6–6.0 Bq/L for 226Ra and 0.7–8.2 Bq/L for 228Ra for both platforms. For Ba, V, Ni and Pb the concentrations measured were in the range of 5.6–25.7 mg/L, 0.15–0.46 μg/L, 4.85–12.14 μg/L and 4.04–12.37 μg/L. A strong correlation between barium and radium isotopes concentration was observed (226Ra: R2 = 0.897;228 Ra: R2 = 0.737). In order to evaluate the environmental impact from discharges of produced water into the sea, the seawater and sediment samples were collected at distances from 250 to 1000 m around the platforms. The seawater samples were analyzed for dissolved and particulate material and the sediment samples for total and leachable fraction. The results show that even for the shortest sampling distance (250 m) from the discharge point, Ba, 226Ra, 228Ra, V, Ni and Pb concentrations in seawater and sediment were similar to the local background, indicating that dispersion by local currents minimizes any environmental impact involving these parameters.