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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 3 Analysis of errors between calculated values and theoretical values of σf in three different lithologic reservoirs saturated with CO2.
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Formation
porosity/% | Sandstone | Limestone | Dolomite | Theoretical
σf/m-1 | Calculated σf/m-1 | Error/% | 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 | 11.088 | 11.125 | 0.33 | 11.820 | 11.714 | -0.90 | | 5 | 9.217 | 9.352 | 1.46 | 10.659 | 10.812 | 1.44 | 11.355 | 11.195 | -1.41 | | 10 | 8.865 | 8.949 | 0.95 | 10.231 | 10.294 | 0.62 | 10.890 | 10.743 | -1.35 | | 15 | 8.513 | 8.529 | 0.19 | 9.803 | 9.804 | 0.01 | 10.426 | 10.315 | -1.06 | | 20 | 8.161 | 8.202 | 0.50 | 9.375 | 9.490 | 1.23 | 9.961 | 9.899 | -0.62 | | 25 | 7.809 | 7.738 | -0.91 | 8.947 | 8.934 | -0.15 | 9.496 | 9.396 | -1.05 | | 30 | 7.456 | 7.492 | 0.48 | 8.519 | 8.565 | 0.54 | 9.032 | 8.936 | -1.06 |
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