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Time-lapse Anomalies Reconstruction via Joint Inversion of Direct Waves and Reflection Images
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
The algorithm of time-lapse velocity anomalies reconstruction using cross-well data is presented. Accurate reconstruction of time-lapse velocity anomalies in inter-well space is important to understand Enhanced Oil Recovery processes. Conventional approaches invert first arrival time delay into a velocity change and hence results significantly depend on the quality of data picking. Moreover, the cross-hole tomography has limited lateral resolution due to specific acquisition geometry. Abakumov et al. (2012) proposed to optimize the functional based on the linear combination of weighted norm of correlation of time-lapse reflection images and direct arrivals. Such approach is stable with respect to phase changes in the data and the lateral resolution is improved by using reflections. Application of the method to synthetic and field data reveals the potential of this algorithm and helps to improve on the data interpretation consistency.