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| 致密储层数字岩心重构及核磁共振响应模拟 |
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邹友龙1,2,谢然红1,2,郭江峰1,2,谭茂金3,胡法龙4,李潮流4,李长喜4,周灿灿4
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(1.中国石油大学油气资源与探测国家重点实验室,北京 102249;2.中国石油大学地球探测与信息技术北京市重点实验室,北京 102249;3.中国地质大学(北京)地球物理与信息技术学院,北京 100083;4.中国石油勘探开发研究院测井与遥感技术研究所,北京 100083)
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| 摘要: |
| 基于物理过程法模拟沉积岩的沉积、压实和胶结过程,构建致密岩石的三维数字岩心。利用随机行走法模拟不同成岩过程岩石的核磁共振响应以及不同润湿性岩石孔隙中流体的核磁共振响应。模拟结果表明,岩石胶结成岩后孔隙半径减小导致核磁共振横向弛豫(T2)分布的峰值向短弛豫方向移动,流体视扩散系数略小于自由扩散系数;致密岩石中随润湿相流体饱和度减小,润湿相T2分布向短弛豫方向偏移,受限扩散越来越明显。 |
| 关键词: 致密储层 数字岩心重构 孔隙尺度 核磁共振响应模拟 流体受限扩散 |
| DOI：10.3969/j.issn.1673-5005.2015.06.008 |
| 分类号::P 313.1 |
| 基金项目:国家自然科学基金委员会-中国石油天然气集团公司石油化工联合基金(U1262114)； 高等学校博士学科点专项科研基金(20130007110012) |
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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 |
