going back to school for MS in exploration geology

I have recently moved back to Texas and i am planning on enrolling in graduate classes for my MS in geology.
After receiving my BS in geology i went on a trip up to Alaska. Four years later, i am working a good but menial refinery job and have decided to get my masters degree...my question is what specific field gives me the most options in todays market. This seems my best course of action as i have no relevent field experience and its been four years since i graduated. Both of which are marks against finding a job as a geologist.