An oil spill from a leaking well off the Brazilian coast northeast of Rio de Janeiro "is not over," the nation’s National Oil Agency warned onNov. 20, 2011.
"The leaking still has not stopped at some points," the monitoring agency said in a statement, referring to images taken Nov. 19 and data from the Navy "which monitored 400 m (1,312 ft) of cracking" early Nov. 20, according to the G1 news service. The oil "continues to drift away from the coast," the report added.
On Nov. 19, Chevron Brazil President George Buck told local media "the pressure of the deposits was underestimated."
Based on an incorrect calculation, the company used a type of material that lacked sufficient weight needed to contain oil, which then leaked and reached the surface, explained the Folha de Sao Paulo newspaper.
Buck had insisted the leak was fully contained on Nov. 13, but noted that the incident was still being investigated.
The oil agency said Nov. 19 that the oil slick was down from 163 square kilometers (63 square miles) earlier in the week to about 18 kilometers (11 miles) long and 11.8 square kilometers (4.5 square miles) wide.
The well, which Chevron said began leaking Nov. 8, is near the Frade field located some 370 kilometers (230 miles) northeast of Rio de Janeiro in an area that is a migratory route for whales and dolphins.
The U.S. oil giant said no oil leaked from the wellhead, and that it was controlling and monitoring the "sheen." It estimated that between 200 and 330 barrels of oil have seeped into the sea since Nov. 8. The energy ministry, for its part, said 220 to 230 barrels of oil were seeping into the ocean daily.
Those estimates were contested by Greenpeace, which said satellite pictures showed a spill "10 times bigger," and likely reached closer to 3,700 barrels a day. SkyTruth analyzed a NASA satellite image of the area and also says the spill could be 3,700 barrels a day.
Source: Dow Jones
NASA image courtesy of SkyTruth.