What does upstream mean in oil and gas?

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Tags

1. #natural
2. #upstream
3. #surface
4. #petroleum
5. #exploratory
6. #fields
7. #sector
8. #searching
9. #underground
10. #crude
11. #wells
12. #subsequently
13. #operating
14. #drilling
15. #potential
16. #underwater
17. #recover
18. #industry
19. #includes
20. #bring