Under Oklahoma’s Statute of Frauds at 15 O.S. §136, certain types of contracts, including contracts involving conveyances of real property or modifications thereof, require that the terms of the transaction be memorialized in writing and signed by the party to be charged, or the party against whom specific performance is sought. Cloud v. Winn, 303 P.2d 305, 308 (Okla. 1956). Because a lease of mineral interests is a conveyance of real property, an oil and gas lease must be in writing. Further, an instrument affecting rights in real estate must be filed in accordance with the recording requirements of Title 16 of the Oklahoma statutes to be valid as against third persons. See Amarex Inc. v. El Paso Natural Gas Co., 1987 OK 48 ¶ 14, 772 P. 2d 905, 908.