Hydrocarbons Accumulations, Reserves Estimation, Risk Analysis & UncertaintiesRCM/OOIP

Who should attend?

  • This course provides participants a practical understanding of hydrocarbon accumulation calculation and the methods to estimate reserves and assess uncertainties.
Audience :
  • Geoscientists and reservoir engineers interested or involved in prospection, reserves estimation and reporting.

Level : Proficiency

Course Content


      • Volumetric method.
      • Gross rock volume, methods of calculation, isobaths, geological models, contacts: logs, MDT.
      • Porosity and Net-to-Gross, logs, notion of cut off.
      • Saturation from logs and cores.
      • Formation volume factor.
      • Exercises.

      • Reserves definition and classification.
      • Methods review: volumetrics, decline curves, material balance, models.

      • Definitions, probability, assessment, exercises.
      • Statistical description of data:
      • Histograms, probability distribution, quantiles, probabilistic reserves.
      • Theoretical models: population, samples, probability density functions.
      • Common distributions.

      • Correlation of reservoir layers in order to visualize the reservoir units.
      • Qualitative log interpretation of each well.
      • Evaluation of Ht, Hu, ρ and Swi on each well for each sub-reservoir unit.
      • Review the available PVT studies and select the most reliable to give the main characteristics of the reservoir fluids.
      • Calculation of the probable (P50) hydrocarbon volumes in place (calculation of rock volumes by using isobath maps).
      • Evaluation of the range of hydrocarbons in place (P10 and P90) and take the uncertainties into account, with both deterministic and stochastic methods. Uncertainties will be assessed with dedicated software tools.

Learning Objectives

  • Upon completion of the course, participants will be able to:
  • estimate the hydrocarbon accumulation using the volumetric method,
  • understand the difference between hydrocarbon accumulation in place and reserves,
  • apply the methods for estimating reserves, both deterministic and probabilistic and gain a thorough understanding of various reserves levels,
  • define the main concepts of risk and uncertainties assessment,
  • integrate risks and uncertainties into reserves evaluation.

Ways & Means

  • Interactive presentations, practical exercises and real case study using a complete data set and dedicated software for uncertainties assessment.