Research Article
Evaluating the Sealing Effectiveness of a Caprock-Fault System for CO2-EOR Storage: A Case Study of the Shengli Oilfield
Table 2
Scores and weights assigned to the various criteria and classes.
| Class
I | Class
II | Criteria | Index
| Scores | Weight
| | | | | |
| | Caprock fault sealing system | Caprock | Displacement work | 1 | | 15 | 7 | 3 | 1 | 0.14 | | Porosity | 2 | | 9 | 7 | 3 | 1 | 0.06 | | Permeability | 3 | | 15 | 7 | 3 | 1 | 0.06 | | Shale content | 4 | | 13 | 5 | 3 | 1 | 0.03 | | Well density | 5 | 15 | 9 | 7 | 3 | 1 | 0.02 | | Fault | Fault active time | 6 | | 9 | 5 | 1 | | 0.01 | | Configuration relationship between fault extension and caprock | 7 | | 9 | 5 | 1 | | 0.05 | | Configuration relationship between fault throw and direct caprock thickness | 8 | | 9 | 5 | 1 | | 0.05 | | Fault dip angle | 9 | | 7 | 5 | 1 | | 0.05 | | Fault lateral displacement work | 10 | | 9 | 5 | | 1 | 0.11 | | Fault vertical displacement work | 11 | | 9 | 5 | | 1 | 0.11 | | Fault lateral permeability | 12 | | 9 | 7 | 5 | 1 | 0.03 | | Fault vertical permeability | 13 | | 9 | 7 | 5 | 1 | 0.03 | | Fault closed coefficient | 14 | 15 | | | | 1 | 0.11 | | Shale smear factor | 15 | 15 | | 7 | | 1 | 0.02 | | Clay smear potential | 16 | | | 7 | | 1 | 0.02 | | Shale gouge ratio | 17 | 15 | | 7 | | 1 | 0.02 |
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