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| | Abstract | | It is desirable to monitor subsurface fluid movement for plannnig enhanced oil recovery (EOR) and controlling fluid injection. We have experimentally carried out monitoring of injected micro-bubble-water by P-wave attenuation tomography for the purpose of developing a high-resolution cross-well monitoring system. Micro-bubble-water, which contains bubbles smaller than 0.1 millimeter in diameter, was injected into underground in between two holes separated by 64m and cross-well tomography was repeated several times before and after injecting micro-bubble-water. The attenuation tomography result showed spread of highly attenuated area spreaded with increasing micro-bubble-water injection, although corresponding velocity change was not observed by traveltime tomography. |
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