Q#1: are there more jobs than job seekers, or vice-versa?
There doesn't appear to be much data that is splitting jobs out by industry for that area of ND that is anything approaching current. So, for question #1, I'll go with experiential data and answer "yes", there are more jobs than seekers. Although, that's fairly irrelevant. The jobs to seeker ratio just has to be better than the surrounding areas to draw workers. It doesn't have to be jobs 2x:seekers 1x.
Q#2: Does everybody who goes to ND or Eagle Ford looking for a frack job get hired? Poorly structured question that is irrelevant. All oil jobs =/= frack jobs. And common sense says, "No. Everybody who goes looking does not get hired." That is true for any job market.