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| | Abstract | | Vast amounts of oil reserves are proven in oil sand in Canada where SAGD is most widely used as an in-situ recovery technique for bitumen production from oil sand. Oil sand formations comprise several types of lithological facies which are divided into massive sand facies, sand with mudstone clast facies, and alteration of sand and mudstone layers facies depending on geometric nature of mudstones distributed in sand. Distributions of the lithological facies in reservoir formations are critical for SAGD production performance because mudstones can be barrier against steam injection, which is the motivation of investigating the elastic properties of oil sand to improve seismic reservoir characterization for the lithological facies. Grain size analysis was conducted to explain the different P-wave velocities observed for the different facies due to different level of sorting. Rock physics model was developed based on the massive sand facies, which is likely to be used for other two facies. The effect of mudstone clasts and mudstone layers on P-wave velocity was evaluated by the solid substitution for pore fluid from bitumen to water. Although P-wave velocities should be varied depending on the volume of mudstones and their geometry, the upper and lower bounds can be defined by bitumen-saturated and water-saturated conditions of the rock physics model, respectively. |
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