Hi:
You would need to convince a company to sponsor you. That means a job offer at the very least and sponsorship on a visa. Without experience in Geology this sounds impossible.
So in this case your choices are to gain some experience in Geology in your home country and then apply for a PR visa (i.e. after 4-5 yrs of experience) or you could do further study here and then apply for a visa available to AU graduates or you could marry an AU PR/Citizen and apply for spouse visa.
You would need to convince a company to sponsor you. That means a job offer at the very least and sponsorship on a visa. Without experience in Geology this sounds impossible.
So in this case your choices are to gain some experience in Geology in your home country and then apply for a PR visa (i.e. after 4-5 yrs of experience) or you could do further study here and then apply for a visa available to AU graduates or you could marry an AU PR/Citizen and apply for spouse visa.