"Oil operation" means the use or maintenance of any installation, facility, or structure used, either directly or indirectly, to carry out or facilitate one or more of the following functions: drilling, redrilling, reworking and repair, production, enhanced recovery, extraction, stimulation, abandonment, processing, storage, or shipping of oil or gas or other hydrocarbon substances or processing.
(Ord. 90-08-1074 § 4 (part))