.is there any scope for finding a job in petrolium industry in India?

I have passed 12th and wish to do engineering in petrolium.is there any scope for finding a job in India? Is there any scope in India?How much get the salary?What are the topics to study in petrolium engineering?Or have i had to change my decition to go for any another cource in engineering like mechanical?if i did not get job in campus interview ,then how can i join in any other petrolium company?How much is the scope for getting job in petrolium industry?