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Shell spots 10-mile oil sheen in Gulf of Mexico

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Shell spots 10-mile oil sheen in Gulf of Mexico

Old 04-12-2012, 11:40 AM
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Default Shell spots 10-mile oil sheen in Gulf of Mexico

http://money.cnn.com/2012/04/12/news....htm?iid=HP_LN

No need to worry the oil company taking care of it.
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Old 04-12-2012, 03:34 PM
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We were flying aerial surveys out of Venice in the summer of 2011 (the year after the spill). Three separate times we saw, photographed, and documented oil slicks and sheens several miles long. We reported all three to the CG office, who basically yawned in our faces and said, Oh yeah, you get those little (!) slicks all the time.

But if you spill 3 drops of diesel at the fuel dock, they will come down on you like a ton of bricks. But for the industry, anything under 50 barrels is a non-event.
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Old 04-12-2012, 05:12 PM
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Only about 240 gallons, obviously a bilge pump out or something.

Natural seepage in the GOM is ~ 65,000 gallons per year....
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Old 04-13-2012, 10:06 AM
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Natural seepage a year into the GOM is around 140,000 tons a year. That is the entire GOM. Most all calculations use the metric ton as a standard when it comes to oil. If it is mostly light crude (sweet crude), you are looking at about 7 pounds per gallon. So, 140,000 m/tons X 2200 lbs (1 metric ton)= 308,000,000 lbs per year. 308,000,000/7 (weight of 1 gallon of crude) = 44,000,000 gallons/42 gallons (1 barrel is 42 gallons) = 1,047,619 barrels and some change....

This occurs naturally....

http://walrus.wr.usgs.gov/reports/re...den_GML_23.pdf
Commercial enterprises (Earth Satellite Corporation
and Unocal Corporation) compiled SAR and other
remote sensing data. With the Earth Satellite dataset,
Mitchell et al. (1999) estimated, during an aggregate
survey of the northern Gulf of Mexico, approximately
1,000 km2 of floating oil, presumably from natural
seeps. Assuming an average oil thickness of 0.1 lm,
MacDonald et al. (1993) calculated that 1 km2 of oiled
surface contains about 100 l oil. If the oil persists on
the surface for 12 h (before evaporating or spreading to
a thickness of less than 0.1 lm), summing over the time
the oil slicks are visible results in an estimate of
73,000 t per year for the northern Gulf of Mexico. This
value does not include the oil seeping from the prolific
Campeche Basin offshore from Mexico in the southern
Gulf of Mexico. Assuming the seep scales are proportional
to the surface area, a seep rate for the entire gulf
is about double the northern gulf estimate, giving a
total Gulf of Mexico seep rate of about 140,000 t per
year.
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