Factorio Forums

The notes for 0.13 says that:

Map generator algorithm changed, further resource field now have greater richness.

I can see this for ores, if I go further away from my base, the amount of resources per tile seems to significantly increases. However for oil it seems that even the really far patches have only 30-40% yield, which makes a heavy game pretty hard. Am I just unlucky with these low yields, or is this a bug, and oil yield is not increased as I go further away?

Searchy searchy!

viewtopic.php?f=7&t=27228

It seems like they tweaked it somewhat towards more wells per patch with lower yields per well. This gets you more "trickle" oil in the long run. And as mentioned in that thread, it does increase with distance, just slowly.

Also, the degradation rate of wells was halved in 0.13, so you'll get more total oil out of a well of the same nominal yield than in 0.12.