5 ILCS 615/9
All petroleum leases other than those provided for in Section 8 of this Act may be granted in parcels as determined by the Department, and shall be upon a royalty of not less than twelve and one-half (12 1/2 %) per centum of all petroleum produced and saved from the lands covered by such lease, or the market value of such petroleum, at the option of the Department, and all leases shall be for a primary term of ten (10) years, and shall provide for an annual rental, payable in advance, of from one ($1.00) dollar to ten ($10.00) dollars per acre, as the Department may determine, which rental shall be credited against future royalties. The form and terms of such leases shall be the same as the standard commercial petroleum lease generally in use in the territory in which the oil, gas or other petroleum products are located, with the addition thereto of such terms as in this Act and the rules and regulations of the Department are provided. Whenever the conditions contained in such standard commercial lease are in conflict with the provisions of the Act, the provisions of this Act shall control.
5 ILCS 615/9