with your experience and education, this contract would barely make sense even if you were single (which I'm assuming you're not).

if you're bringing your family with you, then this offer is really low. if it's just you (and you won't be supporting anyone back home), even in that case you should negotiate hard. the rule of thumb is your base salary at home X 1.5.

Qatar is tax free, but rent + living expenses are high (comparable to downtown washington DC, or manhattan NY). a 2-3 bedroom apartment could easily eat away a good chunk of your paycheck.

you should also consider how badly you want to relocate. sometimes even a slightly better offer might be good enough to decide to move. which company are you looking at btw? i'm in infrastructure.