Reserve Category

Reserve Categories are industry-standard terms that are finer subdivisions of the PRMS “Reserves” Class.
Reserve Categories (on the left) are compared to the PRMS terminology (on the right) below:

 

Common Industry Terminology		PRMS Terminology
Abbreviation	Description	PRMS Resource Category Equivalence (from Figure 1.1)	PRMS Maturity sub-Class (from Figure 2.1)
1P, TP	Proven, Total Proved	P1, Proved, Low, 1P, P90	Any Reserves sub-class
2P	Proved + Probable	2P, Best Estimate, P50,	Any Reserves sub-class
3P	Proved + Probable + Possible	3P, High, P10	Any Reserves sub-class
P1	Proved	P1, Proved, Low, 1P, P90	Any Reserves sub-class
P2, PB, TPA	Probable, Total Probable Additional; the difference between 2P and 1P	P2, Probable	Any Reserves sub-class
P3, PS, TPS	Possible, Total Possible Additional; the difference between 3P and 2P	P3, Possible	Any Reserves sub-class
PDP	Proved Developed Producing	P1, Proved, Low, 1P, P90	On-Production
PDNP	Proved Developed Non-Producing	P1, Proved, Low, 1P, P90	On-Production*
PD	Proved Developed; the sum of PDP and PDNP	P1, Proved, Low, 1P, P90	On-Production*
PUD	Proved Undeveloped	P1, Proved, Low, 1P, P90	Approved for Development; Justified for Development
PNP	Proved Non-Producing; the sum of PNP and PUD	P1, Proved, Low, 1P, P90	Any Reserves sub-class

*PDNP, and PD are included in the PRMS “On-Production”
sub-maturity class because that class is defined as “Producing or capable of Producing”