The Reserves Definitions Committee (RDC)

Rawdon Seager, Chair
Jorge Faz
Shane Hattingh
John Lee
Rod Sidle
Tim Smith


What's New

June 2019 - The Society of Petroleum Engineers has posted an update to the Reserves Auditing Standards on their Petroleum Reserves & Resources Definitions Information page. The document can be accessed by visiting or by clicking here.


November 6, 2018 - The 2018 PRMS version 1.01 is now available from the Society of Petroleum Engineers website. This corrects certain errata in the original version. To obtain your updated copy, click the link below.

2018 PRMS

Available for download for personal and academic work.  For commercial use, please note: The document is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. If you have questions about the use of the PRMS for commercial or derivative use, please contact

Key Changes from the Petroleum Resources Management System (PRMS 2007) to the PRMS 2018 

Reserves Definitions      

1997 SPE/WPC Petroleum Reserves Definitions (Replaced by PRMS)
2000 SPE/WPC/AAPG Petroleum Resource Definitions (Replaced by PRMS) 
2007 Update of 2001 Standards Document 
2007 SPE/WPC/AAPG/SPEE Petroleum Resources Management System (PRMS) 
2011 Guidelines for Application of Petroleum Resources Management System        

Questions for the Reserves Definition Committee can be directed to