I was curious whether the Deepwater Horizon blowout/spill had caused any detectable drop in US crude oil production. Poking around the EIA website, it turns out that they have a weekly estimate of domestic field crude production (meaning, actual crude coming out of the ground, as opposed to refinery gains etc). The full series begins in 1983, currently goes through the week of June 4th, and looks like this:
You can see the long slide (peak US oil production was back in 1970), and then the slide arrested from 2006 on, with even a slight recovery in production in 2008/2009, presumably as a result of the price spike in 2005-2008 promoting more drilling.
Focussing in just on the period since the beginning of 2005, this next chart shows a red line for the April 20th date of the Deepwater Horizon blowout:
Maybe that last little wiggle down has something to do with it, but who knows - really it's no larger a fluctuation than occurs all the time. We'll have to wait until the Minerals Management Service releases May and June numbers for Gulf of Mexico production to be more certain - they are only up to March at present.
So, while the oil spill is certainly a massive regional environmental disaster, the impact on oil production is negligible so far.