ORS § 274.850
The Department of State Lands shall reserve and may exercise the authority to cancel any lease upon which oil, gas or sulfur has not been discovered in paying quantities, upon failure of the lessee after 30 days' written notice and demand for performance to exercise due diligence and care in the prosecution of the prospecting or development work in accordance with the terms of the lease. After discovery of oil, gas or sulfur in paying quantities on lands subject to any lease, such lease may be forfeited and canceled only by appropriate judicial proceedings upon failure of the lessee after 90 days' written notice and demand for performance to comply with any of the provisions of the lease or of laws or regulations applicable thereto and in force at the date of the invitation for bids in pursuance of which the lease was awarded; provided, however, that in the event of any such cancellation, the lessee shall have the right to retain under such lease any and all drilling or producing wells as to which no default exists, together with a parcel of land surrounding each such well and such rights of way through the leased lands as may be reasonably necessary to enable such lessee to drill and operate such retained well or wells. In the event of the cancellation of any lease, the lessee shall have a reasonable time within which to remove all property, equipment and facilities owned or used by the lessee in connection with operations under the lease.
ORS 274.850