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| Reconstruction of digital core of tight reservoir and simulation of NMR response |
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ZOU Youlong1,2, XIE Ranhong1,2, GUO Jiangfeng1,2, TAN Maojin3, HU Falong4, LI Chaoliu4, LI Changxi4, ZHOU Cancan4
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(1.State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China;2.Key Laboratory of Earth Prospecting and Information Technology in China University of Petroleum, Beijing 102249, China;3.School of Geophysics and Information Technology in China University of Geosciences, Beijing 100083, China;4.Department of Well Logging and Remote Sensing Technology, PetroChina Research Institute of Petroleum Exploration ＆ Development, Beijing 100083, China)
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| Abstract: |
| A 3D digital core model of tight rock was constructed by simulating the sedimentation, compaction and cementation processes of sedimentary rocks. The nuclear magnetic resonance (NMR) responses of different diagenetic processes of the sedimentary rock, and the NMR responses of fluid in tight rock under different wetting conditions were simulated using a random walk method. The simulation results show that the decreasing of pore radius caused by cementation process leads to the peaks of NMR transverse relaxation time (T2) distribution shifting to short relaxation time, and results in slightly smaller apparent diffusion coefficient of fluids than its free diffusion coefficient. In tight rock, when the saturation of wetting phase decreases, the peaks of its T2 distributions shift to short relaxation time and the restricted diffusion becomes more obvious. |
| Key words: tight reservoir digital core reconstruction pore-scale NMR response simulation restricted diffusion of fluid |
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