415 ILCS 185/5
As used in this Act:
"Carbon dioxide sequestration reservoir" means a portion of a sedimentary geologic stratum or formation containing pore space, including, but not limited to, depleted reservoirs and saline formations, that is suitable for the injection and permanent storage of carbon dioxide.
"Nonconsenting pore space owner" means a titleholder, as identified in the deed, of any surface estate that overlies pore space proposed to be used for sequestration of carbon dioxide, who does not consent to the use of their pore space for the sequestration of carbon dioxide.
"Pore space" means the portion of geologic media that contains gas or fluid, including, but not limited to, oil or water, and that can be used to store carbon dioxide. "Pore space" also includes solution-mined cavities.
"Pore space owner" means the person who has title to a pore space.
"Sequestration facility" means the carbon dioxide sequestration reservoir, underground equipment, including, but not limited to, well penetrations, and surface facilities and equipment used or proposed to be used in a geologic storage operation. "Sequestration facility" includes each injection well and equipment used to connect the surface facility and equipment to the carbon dioxide sequestration reservoir and underground equipment. "Sequestration facility" does not include pipelines used to transport carbon dioxide to a sequestration facility.
415 ILCS 185/5