system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do oil rigs at sea have a constant flame burning on top of them? Natural gas? And why couldn't it be collected as well instead of wasting it?
gpt
Yes it is natural gas. Oil reservoirs usually come with an associated pocket of natural gas. It could be collected if they wanted to but often its not economical to build the additional infrastructure required to capture and transport it so they just burn it off.