“Injection zone” means a geological formation, group of formations, or part of a formation receiving fluids through a well.
Source: Division of Mineral Resources Management – Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations
Injection Zone―that group of geologic formations which extend from the bottom of the lowermost injection interval to the top of the containment zone.
Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. Regulations