> Beverly Center mall for example has oil wells hidden on site
That's fascinating to read about. It sounds like all the drilling for that oil field happens from that one location now? They use angled bores to draw from different parts of the field.
There are a few more sites in west LA alone they pull from. Some fields are still pretty large though, like the Inglewood Oil Field (1). Many are idle though and apparently 2/3 of idle wells leak and cause health issues in California.