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WORKFLOW PREVIEW (gated)
What this workflow solves
This is the audit chain a reserves engineer needs: volumetric anchor, MBE dynamic check, drive-mechanism-aware recovery factor, DCA forecast reconciliation, gas P/Z when applicable, and water influx accounting if present. Each step is a separate calculation; the value is the chain.
The 6 steps
Step 1
Volumetric OOIP/OGIP
A·h·φ·(1-Sw)/Boi. Static estimate from log evaluation; Monte Carlo on inputs gives P10/P50/P90.
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Step 2
Material Balance Solve
Schilthuis MBE for oil, P/Z plot for gas. Dynamic check from production and pressure history.
Step 3
Drive Mechanism Diagnosis
Havlena-Odeh straight-line plots. Identify whether depletion, gas-cap expansion, water influx, or rock-plus-water expansion dominates.
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Step 4
Water Influx (if applicable)
van Everdingen-Hurst constant-terminal-pressure method or Fetkovich PSS model. Quantify We for the MBE solve.
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Step 5
Recovery Factor by Drive
Arps tables and Craft-Hawkins correlations. Different RF is expected for depletion, water-drive, and gas-cap reservoirs.
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Step 6
DCA Cross-Check
Independent forecast from production decline. Reserves = min(Volumetric × RF, MBE OOIP × RF, DCA EUR); disagreement is a red flag.
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Why this works
The point of multiple methods is that each has different failure modes. Volumetric overestimates if Sw is wrong; MBE underestimates early; DCA overestimates if decline has not stabilized. Reserves engineers reconcile across all three.
References
- Craft & Hawkins (1991). Applied Petroleum Reservoir Engineering, 2nd ed. Prentice Hall.
- Dake (1978). Fundamentals of Reservoir Engineering. Elsevier.
- Schilthuis (1936). Trans. AIME 118, 33-52.
- Havlena & Odeh (1963). JPT 15(8), 896-900.
- SPEE Monograph 3 — Estimating Resources.
Ready to run this on your own data?
Reservoir Engineering Suite includes the linked reserve-estimation tools, saved runs, and exports for review packages.