Fred,
DO you process your application via a headhunter or direct to QP. If via head hunter, they should have given you the information about the position and some indication of renumeration.

If direct, then only way to find out is asking either before or at the interview. At worst you will spend a couple of days of all expenses paid holiday in Doha anyway.....

The fact that QP employs MANY senior people from all over the world and MANY of them worked in multinationals (the like of BP, Shells, ExxonMobil ) before coming here means that the compensation couldn't be that bad.

Oh, and a word of friendly advice: Once you got your offer (God's willing), please do not disclose it by asking whether this salary plus housing etc is enough. Mainly because here (as with everywhere else)it is considered confidential and the prospective employer may not take it kindly.

Cheers
SK