Offshore Support Vessel, Anchor Handling Tugs, Heavylift Vessel, Survey Vessel..position i guess pretty much same with the merchant ship..but i'm not sure how the ticket/license...i heard there some differences btw coastal and foreign going...

My employer and other deepwater drilling contractors (semisubmersible rigs and drillships) also employ marine crews e.g Captain, Chief Mate, Sr. DPO/2nd Mate, DPO/3rd Mate, 3rd Eng, 2nd Eng, Chief Eng, Ballast Control Office, Control Room Officer...

Suggest you go to www.rigzone.com to see vacancies and the requirements for the related position...

anyone working in exxonmobil here? got offer as contract helpdesk analyst...salary increase not much just 300 from current post and no bonus... i tot oil and gas pay usually high?

for people in the industry, this is not uncommon thing. 
more experience Sr. DSV, more higher day rates. Especially those DSV in Ultra deepwater rigs (Semis, Drillships).

One Sr. DSV on our rig last time was getting USD2500/day.