Zone Designations (ZDs) were created in the early 1950s for the natural gas agreements and describe specific intervals or zones proven capable of producing gas in paying quantities. The name of the ZD generally describes the productive interval included in the type well. More importantly, the interval depicted on the type well log specified in the ZD describes the rights held by the natural gas lessee. Alberta Energy uses the defined depth interval in a ZD to exclusively identify the mineral rights granted in mineral agreements.

Deeper Rights Reversion Zone Designations (DRRZDs) were introduced in 1976 to allow for petroleum and natural gas rights, below the base of the deepest productive zone, to be deleted from an agreement and returned to the land bank. This policy was meant to encourage additional development of deeper rights. When using a DRRZD, the name of the stratigraphic interval is most important. As noted in Alberta Energy Regulator (AER)* Decision 95-10, the name of the zone identified takes precedence over the depths identified when using a DRRZD for Crown mineral agreements.

Information letter 1998-14 explains DRRZDs and ZDs in detail.

ZD library

For ZDs, Alberta energy has compiled a PDF library of type well logs and intervals.

Zone Designation (ZD) library (best viewed in IE 7.0 and up)

DRRZD library

Alberta energy has compiled a PDF library, showing the administrative areas or boundaries of DRRZDs as well as their respective type well logs and intervals.

Deeper Rights Reversion Zone Designation (DRRZD) library (best viewed in IE 7.0 and up)

When a DRRZD record is selected you will be directed to a site with the map of that DRRZD as well as its type well log. If the map contains more than one DRRZD you will need to scroll to locate the desired DRRZD log. Base Map Data for the DRRZD maps is provided by the Government of Alberta under, the Alberta Open Government Licence.

Reference, tools and disclaimer

The type well, log and interval for each DRRZD or ZD were assigned by the AER in accordance with the Oil and Gas Conservation Act. The AER is the regulatory board for energy resource development in Alberta.

All raster annotations were performed using the Imaging for Windows Application via Microsoft, as well as the geoSCOUT application.

The data represented on logs and DRRZD maps is for general information only. Users are responsible for verifying the data before making decisions based on these maps and reference wells.


Connect with Alberta Energy’s Professional and Program Services:

Hours: 8:15 am to 4:30 pm (open Monday to Friday, closed statutory holidays)
Email: [email protected]

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