Factorio

Technically they don’t asymptotically go to zero. The minimum yield is the maximum of 20% or 20% of the original yield.

So at worst, an oil field will produce 2 oil/sec, which can still be bumped up by speed modules/beacons as well as mining productivity.

It’s not going to be enough alone for a large base, but I’d say it’s a lot better than almost useless.