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Fundamental Study for Detection of Subsurface Foam Front in the Practice of Foam-Assisted EOR Using AVO
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Recently, foam-assisted EOR has drawn attention because of its high performance to avoid fingering and tonguing effects of injected fluids. Although foam-assisted EOR is theoretically simulated in reservoir engineering studies and is put in practice in some oil fields, the methodology of a survey for monitoring foam behavior in the subsurface has not actively been attempted. In the present study, we investigate the effectiveness of seismic exploration method based on the amplitude versus offset (AVO) in the detection of foam front advancing from injected well in the subsurface. We conduct a numerical experiment with two different models, representing CO2 injection and water injection. We calculate AVO gradient and intercept for each CMP gather, and investigate the characteristics of spatial distribution of them. Our numerical experiments indicated that the spatial variation of these AVO parameters would be used to detect the location of foam front.