Classification and evaluation of coalbed methane resources/reserves based on the Petroleum Resources Management System (PRMS) rules

This paper introduces a set of definitions and classification requirements for coalbed methane (CBM) resources/reserves based on the Petroleum Resources Management System (PRMS).General requirements for the classification of CBM reserves are outlined from seven perspectives: ownership considerations, governmental regulatory and project approval considerations, drilling requirements, testing requirements, infrastructure and market considerations, timing of production and development, and economic requirements.Combined with the geological and engineering conditions, current economics, operating conditions and government policies of CBM, the principles used to classify Proved, Probable, and Possible (3P) reserves and contingent resources were formulated, and demonstrated by a case analysis.These data provide important reference points for the reasonable assessment of CBM reserves.