PRMS - Then and Now

Reservoir Description and Dynamics

Course Description

Since its release in 2007, the Petroleum Resources Management System (PRMS) has become the de facto industry standard for petroleum resources definitions, classification and categorization. Based on principles rather than rules, the PRMS differentiates resources on the basis of project maturity and uncertainty of recovery from a petroleum accumulation. This one-day course will review the basic concepts behind the PRMS and the evolutionary (rather than revolutionary) updates from the 2007 document.

Learning Level


Course Length

1 Day

Why Attend

PRMS is the basis for both internal and external classification, reporting and inventorying of petroleum assets by many international and national oil and gas companies. It is a standard accepted by many regulators for resources reporting by companies listed on international stock exchanges; for private companies and investors, PRMS provides the foundation for internal asset management.

Who Attends

Geoscientists, engineers, accountants, managers and others with an interest in developing petroleum assets.


0.8 CEUs (Continuing Education Units) are awarded for this 1-day course.

Cancellation Policy

All cancellations must be received no later than 14 days prior to the course start date. Cancellations made after the 14 day window will not be refunded.  Refunds will not be given due to no show situations.

Training sessions attached to SPE conferences and workshops follow the cancellation policies stated on the event information page.  Please check that page for specific cancellation information.

SPE reserves the right to cancel or re-schedule courses at will.  Notification of changes will be made as quickly as possible; please keep this in mind when arranging travel, as SPE is not responsible for any fees charged for cancelling or changing travel arrangements.

We reserve the right to substitute course instructors as necessary.

Full regional cancellation policies can be found at the Cancellation Policy page within the SPE Training Course Catalog.


Charles Vanorsdale is a Senior Petroleum Engineering Consultant in the Upstream Development Strategy and Reserves Department of Saudi Aramco. He has been with Aramco for 12 years, where his responsibilities focus on reserve assessment related to drilling activity and integrated reservoir studies, including unconventional oil and gas and EOR. 

Charles has been assessing reserves since 1979 and has authored several papers on the subject, most recently at the 2013 SPE Annual Technical Conference in New Orleans. He has been a member of the SPE Oil and Gas Reserves Committee since 2017

Prior to joining Aramco, he was a corporate reserves coordinator for a major U.S. gas producer where he standardized coalbed methane reserve assessment in compliance with the Securities & Exchange Commission. He has also been employed by several U.S. independent producers and consulting firms, where he had leading roles in acquisitions & divestitures as well as reserve audits of producers including Texaco, Unocal, and Cities Service (now part of OXY). 

He is a licensed professional engineer in Texas and Oklahoma, and a member of SPE and SPEE. He holds a B.S. in Petroleum Engineering and a Masters in Engineering Management, both from the University of Tulsa.