UPDATE 6/11/10 4pm - We're wondering if Platform 23051 was destroyed by Hurricane Ivan in 2004, and if the Ocean Saratoga rig is actually working at the site of the destroyed platform. This would make a lot of sense. If anyone has information that would confirm (or refute) this, please let us know.
UPDATE 6/11/10 5pm - John Wathen tells me that the pilot collected a GPS location while they flew over the Ocean Saratoga rig last weekend. John gave me the GPS coordinate, and it plots right on top of the MMS-given location coordinate for Platform 23051. So I think the platform was destroyed by Ivan, and the leaking well that the Saratoga is working to plug is the well that was under Platform 23051.
Conclusion: the persistent slicks we've been seeing on multiple satellite images are apparently caused by the continuing leakage from this hurricane-damaged well. It would be great if someone from MMS or the Coast Guard would confirm this.
Some recent media reports about our work related to possible leaks unrelated to the BP spill have gotten a few things wrong. Here's a clarification: based on our analysis of multiple satellite images collected since April 25, we see what appears to be a small but persistent oil slick at or very near the known location of Platform 23051. According to MMS this is a fixed oil platform, installed in the 1980s, that has a crew onboard. If this is indeed a small oil slick, it might indicate a small chronic leak related to that facility; it might also be coming from a natural oil seep on the seafloor at or near the platform. There may be other causes that we are not aware of.
Based on the location we published for that platform (a location obtained from the MMS platforms database), a professional photographer flew over the general vicinity and documented what appeared to be an oil slick next to a semisubmersible drill rig. A company news release explains that this rig, the Ocean Saratoga, is working to plug a well that was damaged by Hurricane Ivan back in 2004. The well was reportedly covered by a seafloor landslide, so this is a difficult operation.
None of this changes our main question: how common are smaller spills like this, whatever their cause? What are the impacts? Is this a problem in the Gulf, or not? Would it be a problem with drilling elsewhere, such as in the Arctic or off the coast of Florida?