I am a Texas man, 99% of my friends and schoolmates went into the O&G industry in some way.
I build the Offshore Rigs, we went from turning down work with a backlog of 6+ years to, crap we only have enough work through 2016. I have seen our craft go from 4,000 to 1,000 and staff from 500 to 300.
Many of my friends are ME's working for the oil field service companies (Shlumberger, Baker Hughes, Haliburton). They have taken the hardest hit, and I have seen several friends lose their jobs and transition to a much lower paying job. Interestingly enough, I had turned down a job offer from one of these companies just 2 years ago, they were offering 26% above what I was making but I wanted to be able to do design work.
I have friends that are exploration geologists, or just good ole fashioned roughnecks that have lost their jobs.
Sad thing is, it will get worse before it gets better.