Environmental Statement - Maersk Oil

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Balloch Field Development Environmental Statement 6.4.3. SCENARIO 3: INSTANTANEOUS RELEASE OF THE DIESEL INVENTORY FROM THE DRILL RIG. A worst case diesel inventory loss of 8,642 bbls over a one hour period was modelled. Surface oil modelled outputs 6 ‐ 20 Section 6 Accidental Spills In general, the diesel from the surface release travels in every direction from the source of the discharge. Norwegian waters are at low risk (1 ‐ 10 % probability) of a visible surface spill. No other countries are at risk of a surface spill entering their waters. The outputs are summarised in Figure 6‐12. Shoreline modelled outputs No European shorelines are at risk from the diesel spill. Water column and sediment modelled outputs Following a loss of diesel inventory from the drill rig, water column concentrations are not expected to exceed 50 ppb beyond approximately 35 km from the release, except very locally around patches of surface oil. Sediment concentrations of around 3 mg/kg (peak) and 2 mg/kg are predicted in small, isolated areas, which could be higher locally. This average value is considerably below the 50 mg/kg OSPAR recommendation for oil in sediment. Fate of oil and fixed wind analysis The fate of the diesel associated with loss of inventory from the drilling rig is shown in Figure 6‐13. This shows that after 30 days approximately 45 % has decayed, 45 % has evaporated and the remaining 10% is in the sediment. Evaporation and decay are the main factors at work reducing diesel in the environment. At the end of the simulations, a small percent of the oil is still present in the water column, dispersed over a wide area. Fixed wind analyses predict that in the presence of 30 knot offshore and onshore winds, hydrocarbons will not cross the median line. The outputs are summarised in Figure 6‐13.
Balloch Field Development Environmental Statement Section 6 Accidental Spills Figure 6‐12 Surface slick summary outputs for diesel inventory loss. Diesel release Oil type Probability of visible surface diesel at any time Marine Diesel (IKU) Release position Volume released 8,642 bbls Release duration Rate of release Total inventory Median lines crossed % likelihood Mass balance (tonnes) 60°00'N 59°00'N 58°00'N 57°00'N 56°00'N 1400 1200 1000 800 600 400 200 0 2°00'W 100 km 2°00'W 0°00'E 0°00'E 2°00'E 2°00'E 4°00'E 4°00'E Norway Faeroes Denmark Neth's 1 ‐ 10% 0% 0% 0% Typical mass of diesel on surface over time 6°00'E Statistical Map: Surface: Probability of contamination above threshold (0.000 mm) [%] 6°00'E Surface 31 days 0 5 10 15 20 25 30 35 Time (days) Surface 60°00'N 59°00'N 58°00'N 57°00'N 56°00'N 6 ‐ 21
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B ‐ 2 Halocarbon release during e
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B ‐ 4 Lube and hydraulic oil spil
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Discharges to Sea Discharge from pi
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Production Phase Environmental Aspe
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B ‐ 10 Drainage water Discharge o
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Physical presence Oil and gas infra
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Major accidental events Other envir
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Environmental Statement - Maersk Oil

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