John: This is a land title issue. An attorney or landman can run the title and determine who has title to the property. Unfortunately Caddo county does not provide any method to search online. This means that a trip to Anadarko.
If it was in the name of an ancestor, then you may want to consider filing an affidavit of heirship (AOH). This should insure that you can be located by by leasing agents or landmen. Also if there is any activity or pooling with the corporation commission, you should get notice. However, in order for the AOH to create marketable title in you it must be 1) created correctly in the eyes of the title examiner; and 2) be on file for 10 years with nothing contradictory filed in the interim. It is most likely that if there is production and royalties to be paid the company will require a probate. Oklahoma Probate Options