About the same as everyone else, dosn't matter if your a desk jocky, cook, or in supplies, you'll most likely get deployed same amount of times as the infantry in the National Guard.
And seeing as how your job is petroleum, you'll be very important out in the field. Vehicles need fuel you know.
Once you are finished with Basic and AIT, you will report to your assigned reserve unit. If the reserve unit gets activated, then it chances are you will go since you are MOS q by that time.