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Certified Petroleum Geologist Directory

Welcome to the new DPA Member Directory

Membership has its privileges and one of these is to build relationships with other association members that share similar disciplines and interests. DPA leadership is also concerned about protecting the identity and contact information of its members. For that reason there are some limitations on this directory access.

  • Only 250 records will be displayed at any time.
    Those members who already know you should be able to know enough information to hone their search to find you. Should this not be the case, you may email AAPG Member Services and request to get in touch with the person you are seeking.
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    In the name of privacy this page times out to keep people from harvesting contact information for the purpose of soliciting business. In the name of protecting your good name, we understand anyone may be interrupted and called away from their current task. By timing out the page, we make sure someone is not able to use your log in without your knowledge.
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21 January, 2020

Resources Estimation and Reserves Evaluation


Estimation of in-place and recoverable resources as well as the evaluation of reserves are among the key processes in the oil and gas business. The lecture introduces the fundamental knowledge on terminologies and methodologies for students.

The VG-talk first discusses the volumetric Petroleum Initially In-Place (PIIP) resources estimation parameters i.e. trap volume, trap-fill ratio, gross rock volume, net-to-gross, porosity, hydrocarbon saturation and formation volume factor. The lecture proceeds with the overview of the recovery factor and the Technically Recoverable Resources (TRR).

Estimations made for the parameters above are characterized by significant uncertainties. Deterministic and probabilistic (stochastic) approaches are discussed in detail. The uncertainty analyses are demonstrated at the maturation milestones of oil and gas accumulations: undiscovered leads and prospect, discovered, undeveloped and produced pools.

The last lecture session summarizes the principles of reserve evaluation with special emphases on the commerciality criteria therein. Finally, we will conclude with the maturity-based classification and the probability-based categorization of the TRR.

Those who attend the talk will not anymore be confused by terms like “Contingent Resource”, “P50” or “Proved Reserves”.