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Braided River Reservoir Architecture Modelling And Remaining Oil Analysis
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, ECMOR XVI - 16th European Conference on the Mathematics of Oil Recovery, Sep 2018, Volume 2018, p.1 - 9
Abstract
The braided river is mainly composed of mid-channel bar and channel. The falling-silt seams are developed in the mid-channel bar, which can be identified by higher GR respond and 5%-25% return in RMN curve compared with the main bar sandbody. The architecture model of braided river is featured by gentle down-flow progradation and multi-stage vertical accretion, with the development of falling-silt seams mostly in the tail of mid-channel bar. The falling-silt seams are nearly horizontal and parallel with the main flow line, with the dig angle of 0-3 degree, the average length of 300m, the average width of 125m and the average thickness of 1.25m. According to the statistical analysis, the average length ratio of falling-silt seam and mid-channel bar is in the range of 30%-90%, the average width ratio is mainly in the range of 60%-80%, stating different erosion degree by following sedimentation. The remaining oil is distributed mainly around the development of falling-silt seams, which is also influenced by the incision between mid-channel bar and associated channel. So, a small space well pattern (close to the scale of falling-silt seams) is proposed.
The study offers a systematic study on braided river reservoir characterization and remaining oil analysis, which possesses a large portion of proved reserve worldwide. It offers an integrated method for understanding other similar oilfields in the future.