Differences in Estimating Reserves Between Geothermal and Petroleum Reservoirs
- Key words
- reserves, petroleum
- Location
- Hexiwu oil reservoir, China
- Conference
- Stanford Geothermal Workshop
- Year
- 2009
- Session
- Emerging Technology
- Language
- English
Full text
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Abstract
The existing volumetric approach was honored by considering the effects of oil and gas saturations on the evaluation of geothermal resources in oil and gas reservoirs. The main reason to do so was that oil and gas phases may not be simply substituted by water because the values of the specific heat of oil and gas are smaller than that of water. We selected an oil reservoir, Hexiwu, from Huabei oil field as an example to apply the method. The effects of oil and gas saturation on the geothermal reserve were investigated at different values of porosity and the results were compared to the existing approaches. It was found that the existing volumetric method tends to overestimate the geothermal reserves in oil and gas reservoirs. The greater the oil or gas saturation is, the more the overestimation of the geothermal reserve is. The results showed that it is necessary to consider the effects of oil and gas saturations on the estimation of geothermal reserve in oil and gas reservoirs.
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