I have already seen a few ad valorem tax appraisals this year and the counties are using ~$63 /bbl oil! Some of my clients are seeing taxes that are higher than what they will make this year.
What county and state?
In Texas, the county must use the average commodity price received for the previous 12 months (I.e. 2020).
If you are talking about Reeves County, Texas, do a search in the upper right. There are already several threads on this.