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| |+ {{table number|1}}Summary of methods used to derive hydrocarbon reserves | | |+ {{table number|1}}Summary of methods used to derive hydrocarbon reserves |
| |- | | |- |
− | ! Method | + | ! Method || Application || Accuracy |
− | ! Application
| |
− | ! Accuracy
| |
| |- | | |- |
− | | Volumetric | + | | Volumetric || OOIP, OGIP, recoverable reserves. Use early in life of field. || Dependent on quality of reservoir description. Reserves estimates often high because this method does not consider problems of reservoir heterogeneity. |
− | | OOIP, OGIP, recoverable reserves. Use early in life of field. | |
− | | Dependent on quality of reservoir description. Reserves estimates often high because this method does not consider problems of reservoir heterogeneity. | |
| |- | | |- |
− | | Material balance | + | | Material balance || OOIP, OGIP (assumes adequate production history available), recoverable reserves (assumes OOIP and OGIP known). Use in a mature field with abundant geological, petrophysical, and engineering data. || Highly dependent on quality of reservoir description and amount of production data available. Reserve estimates variable. |
− | | OOIP, OGIP (assumes adequate production history available), recoverable reserves (assumes OOIP and OGIP known). Use in a mature field with abundant geological, petrophysical, and engineering data. | |
− | | Highly dependent on quality of reservoir description and amount of production data available. Reserve estimates variable. | |
| |- | | |- |
− | | Production history | + | | Production history || Recoverable reserves. Use after a moderate amount of production data is available. || Dependent on amount of production history available. Reserve estimates tend to be realistic. |
− | | Recoverable reserves. Use after a moderate amount of production data is available. | |
− | | Dependent on amount of production history available. Reserve estimates tend to be realistic. | |
| |- | | |- |
− | | Analogy | + | | Analogy || OOIP, OGIP, recoverable reserves. Use early in exploration and initial field development. || Highly dependent on similarity of reservoir characteristics. Reserve estimates are often very general. |
− | | OOIP, OGIP, recoverable reserves. Use early in exploration and initial field development. | |
− | | Highly dependent on similarity of reservoir characteristics. Reserve estimates are often very general. | |
| |} | | |} |
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