Todd is correct, Oklahoma intestacy law controls over minerals.
You can read the following: Keep in mind that there are two sections one for pre 7/1/1985 deaths and one for those who died thereafter. http://www.oscn.net/applications/oscn/DeliverDocument.asp?CiteID=73029
You probably won’t find an Oklahoma statute. But caselaw is clear that
Estate of Boyd v. Boyd, 321 P.3d 1001 (Okla. Civ. App., 2014) It says, that the laws of another state have no bearing on property rights in Oklahoma.
In short, even if a probate is done in California, an Oklahoma probate will be required to clear title.
Fortunately, Oklahoma has good options for expedited probate of non-resident decedents.