We can't generalize about this problem. After all, the operation of state-owned enterprises needs all kinds of talents, and what majors to recruit depends on the needs of the company at that time. But as far as your undergraduate geology is concerned, it is no problem for graduate students to continue studying geology in these three enterprises. After all, the exploration, development and exploitation of oil are closely related to geology, and there are a group of people in the research institute who specialize in studying geological conditions to find new oil reservoirs. You should also be very clear about this. I hope it helps you. As for the upstairs saying that CNOOC exploration is very hard, I think it has something to do with the pursuit of life. It is not difficult to do a good job. If you want to do it, go home and get a chair and sit on the balcony and wait for the pie to fall! Ha ha. I hope it helps you.