Well capped, but oil 'missing'

2010-07-27 12:30
Marine reef ecologist Scott Porter works to remove oil from the Deepwater Horizon spill off his hands in the Gulf of Mexico south of Venice. (Eric Gay, AP)

Marine reef ecologist Scott Porter works to remove oil from the Deepwater Horizon spill off his hands in the Gulf of Mexico south of Venice. (Eric Gay, AP)

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New Orleans - With BP's leaking well in the Gulf of Mexico finally capped, the focus shifts to the surface clean-up and the question on everyone's lips is: Where is all the oil?

For three long months, a massive slick threatened the shorelines of Louisiana and other southern US Gulf Coast states as BP tried everything from top hats to junk shots and giant domes to stanch the toxic sludge.

A cap stopped the flow on July 15 and now, thanks to frantic efforts to skim and burn the crude on the surface, the real difficulty is finding the oil rather than cleaning it up.

Some 150 reconnaissance planes fly constant sorties from Florida to Texas noting any oil sightings, while flat-bottomed boats trawl the marshes for lumps of tar too large to biodegrade.

"What we have is an aggregation of hundreds of thousands of patches of oil and the challenge is to find out where they are at right now because they are widely dispersed," said US spill chief Thad Allen.

Options


Pressed further on the patches, Allen relented: "Maybe patches is a misnomer on my part. What we're seeing are mats, patties, small concentrations, very hard to detect, but they're out there.

"What we're trying to figure out is where is all the oil at and what can we do about it."

The figures speak for themselves. Before the cap went on, some 25 000 barrels of oil a day were being skimmed from the thickest part of the slick near the well site.

By the time tropical storm Bonnie arrived last week, the take was down to a pitiful 56 barrels, begging the question of what to do with the fleet of 800 skimmers, many of them run by disgruntled fishermen.

Allen said he was already looking at trying to redeploy the so-called Vessels of Opportunity in surveillance and testing programmes and was meeting local leaders on Thursday to discuss options.

As to where all the oil that hasn't been skimmed or burned off has gone, opinions vary: some experts say it has been broken down naturally by the elements and by microbes in the ocean, others fear it could be lingering undetected in underwater plumes.

Only weeks ago, the slick was an unstoppable force that couldn't be prevented from swamping shorelines and slowly choking helpless pelicans, now the oil is an elusive enemy, one that has to be tracked down.

Plan

The latest "Nearshore Surface Oil Forecast" from the US government's National Oceanic and Atmospheric Administration (NOAA) indicated only seven sizeable patches of surface oil, all light sheen.

An over flight on Sunday identified one thicker patch of emulsified crude: a flotilla of skimmers was immediately dispatched and made short work of mopping it up.

Rear Admiral Paul Zukunft, a government on-scene co-ordinator, is stationing vessels at the many inlets that run into Louisiana's precious marshes to ward off the arrival of any toxic sludge, what he calls his "fire department".

"In the event we do see any oil approaching... we're right there waiting for it, ready to attack it and get it before it really gets into those marshlands," he said.

With hopes high the well will be sealed for good next week, Allen was conscious of the need to plan for the next phase, admitting: "We are going to have to figure out how we make a transition in our resources."

Sophisticated underwater operations involving fleets of robotic submarines at brain-crunching depths will make way for the less glamorous but equally complex work of Shoreline Clean-up Assessment Teams, Scats for short.

"They will sign off literally mile by mile where we've had oil impact," said Zukunft. "And that is the very long phase of this operation where you ultimately determine how clean is clean."

Upbeat assessment

Approximately 1 025km of Gulf Coast is officially listed as "oiled", 582km in Louisiana, 175km in Mississippi, 112km in Alabama, and 154km in Florida.

The beaches should be relatively painless to mop up, but cleaning up the maze of marshes, where there's nothing to stand on and shallow-bottomed boats are needed to navigated the narrow channels, is a logistical nightmare.

Geologist Ed Owens, a world authority on protecting shorelines from oil spills contracted by BP to lend his expertise to the response effort, gave an upbeat assessment on Monday, saying the marshes should recover in a matter of months as only a "tiny fraction" of oil had infiltrated them.

Other leading scientists though have warned of a decades-long effect on marine life that could lead to a shift in the overall biological network in the Gulf of Mexico.

Read more on:    bp  |  us  |  us oil slick
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