DRRZD Legend and Map Directory
Deeper rights reversion was introduced into the Department of Energy’s tenure system in 1976. It allows for petroleum and natural gas rights below the base of the deepest productive zone to be deleted from a lease and returned to the land bank. This releases the rights that had been sterilized by shallow production and allows for further development. The Department of Energy’s Information letter 1998-14 discusses deeper rights reversion in detail.
Deeper rights reversion zone designation (DRRZD) - identifies a zone by its name. As noted in EUB* Decision 95-10, historically the name of the zone identified within type wells takes precedence over the depths identified in terms of utilizing a DRRZD.
Environment and Resource Services has compiled a PDF library, showing the administrative areas of DRRZD’s as well as their respective type well log and interval. These files can be viewed using Acrobat Reader.
Notes & Disclaimers
Note 1: Log Annotation Guide: For each DRRZD type well log, the interval is annotated with blue, and indicated further by an arrow within the interval. All other specified tops were provided on the ERCB database, and marked by a red line. For consistency, all depth numbers were recorded in red.
Note 2: Upon clicking one of the DRRZDs, you will be directed to a site with the map of that DRRZD as well as its type well log. In some cases a map may contain more than one DRRZD. If so, simply scroll through the pages after the map until you find the desired DRRZD log.
*Note: On January 1, 2008, the Alberta Utilities Commission Act split the EUB into two new regulatory bodies, the Energy Resources Conservation Board (ERCB) and the Alberta Utilities Commission (AUC). The ERCB is responsible for the development of Alberta’s oil and gas resources and the AUC is responsible for the distribution and sale of electricity and natural gas to Alberta consumers.
