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Luo, Qiang (Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, CAS and University of Chinese Academy of Sciences) | Wang, Yibo (Institute of Geology and Geophysics, CAS) | Chang, Xu (Institute of Geology and Geophysics, CAS) | Zeng, Rongshu (Institute of Geology and Geophysics, CAS) | Zheng, Yikang (Institute of Geology and Geophysics, CAS) | Wang, Yongsheng (China Shenhua Coal to Liquid and Chemical Co., Ltd.)
Baseline and repeat VSP surveys were conducted by Shenhua CCS (Carbon Capture and Storage) demonstration project in Ordos Basin, China. A complete workflow of time-lapse VSP monitoring method was presented in this paper. Wave field separation and consistency processing, two key techniques in time-lapse VSP data processing, worked well. The upgoing P wave was used to image timelapse profiles by the VSP-CDP stack. Comparing the results, it was found that the time-lapse VSP method provides accurate and high-resolution images to monitor the CO2 diffusion range. The reliability of the method was then checked by the lithology of the target layer. With this current time-lapse VSP and geological analysis, the results showed that there is no obvious danger of gas leakage in the project, and that CO2 has been sealed in five predetermined reservoirs.
Presentation Date: Monday, October 15, 2018
Start Time: 1:50:00 PM
Location: 204C (Anaheim Convention Center)
Presentation Type: Oral