Research Article
Numerical Simulation of Time-Varying Characteristics in a High-Permeability Sandstone Reservoir: A Case of Gaoqian Southern Area
Table 4
Changes of clay mineral contents before and after water flooding.
| Lithofacies | Displacement stage | Overall amount (%) | Rate of change | S (%) | Rate of change | I/S | Rate of change | I (%) | Rate of change | K (%) | Rate of change | C (%) | Rate of change |
| Fine sandstone facies | Before water flooding | 20.0 | -43.3 | 6.8 | -47.0 | 6.2 | -37.1 | 1.2 | -62.0 | 4.4 | -29.0 | 1.4 | -82.5 | After water flooding | 11.3 | 3.6 | 3.9 | 0.5 | 3.1 | 0.2 | Middle sandstone facies | Before water flooding | 14.6 | -31.8 | 7.2 | -21.1 | 0.0 | / | 1.5 | -88.4 | 4.7 | -42.5 | 1.2 | 15.0 | After water flooding | 10.0 | 5.7 | 0.0 | 0.2 | 2.7 | 1.4 |
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S: smectite; I: illite; K: kaolinite; C: clay.
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