Inherited Family Lease for Oil, Gas and Minerals: Is the Lease Valid?

My grandmother had an Oil, Gas and Mineral lease for from 1983 with Samedan Oil, which was acquired by Noble Energy, which was acquired by Chevron. The land is in Wood County, Tx. I am unaware if my grandmother ever received royalties and my mother (who has recently passed) never investigated the lease. How do I get started to determine if the lease is valid and if oil, gas or minerals were found on this property? I have a notarized copy of the signed lease. I am unfamiliar with this topic. Thank you.

You can either look up the description of the acreage by block, abstract and section on the Texas Railroad commission GIS site, or you can post them here and someone on the forum can look it up to see if there are any wells.