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A method of monitoring gas saturation in carbon dioxide injection heavy oil reservoirs by pulsed neutron logging technology
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FAN Jilin,ZHANG Feng,TIAN Lili,LIANG Qixuan,ZHANG Xiaoyang,FANG Qunwei,LU Baoping,LI Xianghui
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Table 2 Analysis of errors between calculated values and theoretical values of σf of sandstone reservoirs.
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| Formation porosity/% | Saturated with heavy oil | Saturated with CO2 | | Theoretical σf/m-1 | Calculated σf/m-1 | Error/% | Theoretical σf/m-1 | Calculated σf/m-1 | Error/% | | 0 | 9.570 | 9.622 | 0.54 | 9.570 | 9.622 | 0.54 | | 5 | 9.766 | 9.865 | 1.01 | 9.217 | 9.352 | 1.46 | | 10 | 9.963 | 10.105 | 1.43 | 8.865 | 8.949 | 0.95 | | 15 | 10.160 | 10.210 | 0.49 | 8.513 | 8.529 | 0.19 | | 20 | 10.357 | 10.480 | 1.19 | 8.161 | 8.202 | 0.50 | | 25 | 10.554 | 10.721 | 1.58 | 7.809 | 7.738 | -0.91 | | 30 | 10.750 | 10.916 | 1.54 | 7.456 | 7.492 | 0.48 |
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