“Confining zone” means a geological formation, group of formations, or part of a formation that is capable of limiting fluid movement above and below an injection zone.
Source: Division of Mineral Resources Management – Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations
Confining Zone―the impermeable geologic formation that is located below the base of the USDW and which directly overlies and is contiguous with the injection zone.
Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. Regulations