| 基于低场核磁共振的煤储层束缚水饱和度应力响应研究与动态预测——以保德和韩城区块为例 |
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| 引用本文： | 侯伟,赵天天,张雷,熊先钺,许浩,巢海燕,张伟,王伟,张慧.基于低场核磁共振的煤储层束缚水饱和度应力响应研究与动态预测——以保德和韩城区块为例[J].吉林大学学报(地球科学版),2020,50(2):608-616. |
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| 作者姓名： | 侯伟 赵天天 张雷 熊先钺 许浩 巢海燕 张伟 王伟 张慧 |
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| 作者单位： | 1. 中石油煤层气有限责任公司, 北京 100028;2. 中国地质大学(北京)能源学院, 北京 100083;3. 中国地质大学(北京)煤层气国家工程中心煤储层实验室, 北京 100083 |
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| 基金项目： | 国家科技重大专项（2016ZX05042-002）；中国石油天然气股份有限公司重大科技专项（2017E-1405） |
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| 摘 要： | 煤层气开发过程中储层应力的变化对束缚水饱和度有重要影响。通过对不同煤阶煤储层的煤样进行覆压低场核磁共振系列实验，采用谱图形态经验判定法对核磁T2截止值进行标定，在此基础上分析了不同煤阶储层束缚水饱和度随应力的变化规律，并对保德和韩城区块的束缚水饱和度开展了动态计算。实验结果表明：束缚水饱和度具有较强的应力敏感性，并且在有效应力增加初期变化最为强烈；由于孔隙结构的差异，这种应力敏感性在保德区块表现得更为强烈。动态预测结果表明：由于保德区块储层埋深变化范围较小，其初始束缚水饱和度受埋深影响的总变化量小于韩城区块；埋深较浅的储层束缚水饱和度在开发过程中的应力敏感性更强，但开发过程进行到末期后，束缚水饱和度总的增加幅度基本一致。
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| 关 键 词： | 煤储层 低场核磁共振 束缚水饱和度 应力响应 煤层气 开发动态 |
| 收稿时间： | 2019-11-20 |
Stress Sensitivity and Prediction of Irreducible Water Saturation in Coal Reservoirs in Baode and Hancheng Blocks Based on Low-Field Nuclear Magnetic Resonance |
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| Hou Wei,Zhao Tiantian,Zhang Lei,Xiong Xianyue,Xu Hao,Chao Haiyan,Zhang Wei,Wang Wei,Zhang Hui.Stress Sensitivity and Prediction of Irreducible Water Saturation in Coal Reservoirs in Baode and Hancheng Blocks Based on Low-Field Nuclear Magnetic Resonance[J].Journal of Jilin Unviersity:Earth Science Edition,2020,50(2):608-616. |
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| Authors: | Hou Wei Zhao Tiantian Zhang Lei Xiong Xianyue Xu Hao Chao Haiyan Zhang Wei Wang Wei Zhang Hui |
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| Institution: | 1. Petrochina Coalbed Methane Company Limited, Beijing 100028, China;2. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;3. State Key Laboratory of Coal Reservoir of National Engineering Research Center of Coalbed Methane Development&Utilization, China University of Geosciences(Beijing), Beijing 100083, China |
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| Abstract: | The stress change has an important influence on the irreducible water saturation in the process of coalbed methane development. A series of nuclear magnetic resonance (NMR) experiments were performed on the coal samples from different rank coal reservoirs, the T2 cut-off value was calibrated by the empirical determination method of spectral pattern,the variation of irreducible water saturation with stress in different coal rank reservoirs was evaluated, and further, its dynamic changes with the development of coalbed methane in the study area were also predicted. The experimental results show that the irreducible water saturation has a strong stress sensitivity, and its change is the strongest at the initial stage of effective stress increase. Due to the difference of pore structure, the stress sensitivity is more intense in Baode block. The predicting result in Baode block shows that the total variation of initial irreducible water saturation affected by buried depth is smaller than that in Hancheng block because of the small variation range of buried depth in Baode block. In the process of coalbed methane development, the irreducible water saturation of shallow buried reservoirs has a stronger stress sensitivity, but the overall increase is basically the same at the end of the development process. |
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| Keywords: | coal reservoir low-field nuclear magnetic irreducible water saturation stress response coalbed methane developing dynamic |
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