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电缆核磁共振测井仪探测特性研究 总被引:8,自引:5,他引:3
磁场形状和分布对核磁共振测井仪探测特性有决定性的作用. 该文利用电磁场有限元方法,模拟分析了国际主流核磁共振测井仪MRIL-P、CMR、 MREx、以及MR Scanner等4种仪器的磁场分布,考察了探头结构参数对磁场分布的影响,并进一步分析了仪器探测特性及其影响因素,同时对探头磁场形状进行了优化匹配,确定了探头的结构设计,并对比分析了4种探头之间的优缺点. 结果表明,梯度磁场方案优于均匀磁场方案; 居中型探头结构相对简单,信号量大,但其测量信号受钻井液影响; 贴井壁型探头结构相对复杂,信号量较小,但其设计灵活,测量信号不受钻井液影响. 相似文献
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井下核磁共振流体分析实验室及其应用 总被引:1,自引:1,他引:0
井下流体分析在储层实时评价有十分重要的应用. 该文介绍了NMR流体分析实验室的发展,并以哈里伯顿的井下NMR流体分析实验室为例, 详细讨论了其关键技术,包括探头结构、磁体结构和电路结构,探讨了获取流体核磁共振特性参数的测量方法. NMR流体分析实验室可以获取流体的多种重要参数,结合NMR测井能够进行综合解释,其实时评价性能实现NMR测量的优势. 相似文献
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核磁共振T2谱换算孔隙半径分布方法研究 总被引:4,自引:0,他引:4
岩芯核磁共振T2谱和压汞分析数据均在一定程度上反映了岩石的孔隙结构特征,理论分析和二者频率分布图对比表明,这两组数据有较好的相关性,核磁共振T2谱能够换算为反映岩石孔隙结构特征的孔隙半径分布图. 本文应用最大相关性原理、最小二乘法及插值算法等数学方法,给出了一个改进的将T2谱换算为孔隙半径分布图的实用有效新方法,求得了T2弛豫时间与岩芯孔隙半径r之间的换算系数C,计算过程中着重对比了T2谱与压汞数据的主要分布区间,并考虑了压汞进汞饱和度小于100%对换算结果的影响. 天然砂岩岩芯核磁共振T2谱换算为孔隙半径分布图的实际应用效果表明,着重对比T2谱与压汞数据的主要分布区间,同时考虑压汞进汞饱和度小于100%对换算结果的影响是必要的,换算结果更加真实可信. 相似文献
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针对高压脉冲放电破岩电弧等离子体通道长度难以预测的问题,构建了高压脉冲放电破岩综合试验平台,测量了花岗岩-自来水组合介质下电弧等离子体通道发展特性及典型电流、电压参数,提取了不同电极间距和脉冲放电次数下岩石表面形成的破碎区域。基于能量平衡方程建立了岩石中电弧等离子体通道的阻抗模型,采用迭代优化算法获取阻抗模型参数的近似最优解,模型计算结果与试验结果的相对误差小于7%。基于优化参数,利用实测电流电压数据预测了等离子体通道的长度。模型预测的等离子体通道长度与实测值的绝对误差均处于毫米量级,且两者的相对误差小于10%,为高压脉冲放电破岩系统电源-电极负载的匹配设计提供了理论支撑。 相似文献
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核磁共振波谱在药物发现中的应用 总被引:2,自引:2,他引:2
核磁共振波谱通过检测组成有机化合物分子的原子核跃迁而得到反映核性质的参数以及周围化学环境对这些参数的影响规律. 这些参数的相关内容包含了极其详尽的有机化合物分子结构和分子间相互作用的信息,并构成了核磁共振结构解析和生物靶分子-配体相互作用研究的理论基础. 在生物医药研发领域内,科研院所和公司企业的研发工作者们一直在努力探索利用核磁共振波谱监测生物靶分子-配体相互作用作为药物发现工具的潜能. 本文旨在针对核磁共振波谱在药物发现过程中活性化合物筛选的最新研究进展进行综述. 相似文献
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低孔低渗碳酸盐岩储层矿物成分复杂、岩石骨架参数难以确定、储集空间类型多样、孔隙结构及孔渗关系复杂、常规测井曲线响应特征不明显,使其测井评价极其困难.本文利用核磁共振测井定量评价低孔低渗碳酸盐岩储层岩心的孔隙结构、计算储层参数.利用T2谱分布曲线分析孔隙结构、计算T2截止值;在此基础上计算岩心总孔隙度、有效孔隙度、束缚水孔隙度、渗透率等储层参数,并与常规岩心实验结果进行对比分析;最后,总结出核磁共振测井在低孔低渗储层中的应用优势与局限,为核磁共振测井评价模型的建立提供基础数据. 相似文献
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层状的过渡金属硫化物及其衍生物在许多领域内有着广泛的应用前景. 具体应用包括催化、陶瓷、润滑、能量储存、半导体、电子与光学器件. 该文报道了作者最近用固体核磁共振光谱的方法来表征几种有代表性的过渡金属硫化物(MS2: M=Zr, Ti, W, Mo和Ta)的结果. 并在不同的磁场强度下(21.1、14.1、9.4 T)成功地获取了33S, 47/49Ti,91Zr,95Mo 在天然丰度下的固体核磁共振光谱. 为了帮助解释实验结果,同时还进行了量子化学计算. 实验及理论计算的结果都表明33S, 47/49Ti, 91Zr, 95Mo 的固体核磁共振参数对于这些核的局部几何与电子环境非常敏感. 相似文献
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储油岩芯二相液体吸附特性的NMR研究及应用 总被引:2,自引:1,他引:1
为研究储油岩芯对液体的吸附机理,我们特地用同一岩芯制成以下几种样品:(1)吸附不同量的煤油;(2)吸附不同量的水;(3)先吸附一定量的水再吸附一定量的煤油.对以上三组样品,做了NMR自旋—晶格弛豫时间测定;考查了岩芯样品中各弛豫成分量与液体吸附量的变化规律;得出了岩芯内水和煤油受束缚越紧其弛豫时间越短的结论.并依据大量石油地质学的结论建立了砂岩孔隙中油水二相系统的核磁共振模型. 相似文献
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《波谱学杂志》2011,28(2):299-300
Dear colleagues and friends,
On behalf of the organizing committee, I would like to invite you to participate in the 11th International Conference on Magnetic Resonance Microscopy (ICMRM), August 14~18, Changping, Beijing, China.
The 11th ICMRM will follow the fine tradition that has been established in 1991 starting with the very first ICMRM in Heidelberg. The conference will be devoted to the latest developments in NMR methods, equipment, and applications of spatially resolved NMR techniques; it is also designed to provide a platform to enhance scientific communication between industry and academia, and between researchers from countries spanning the globe.
We have received more than 130 abstracts from many of the fine NMR laboratories worldwide, and also invited 22 renowned scientists to give presentations on various aspects of NMR, including Sir Paul Callaghan, Prof. Warren S. Warren, Prof. Axel Haase, Prof. Eiichi Fukushima, Prof. Bernhard Blumich and Prof. Bruce Balcom. In addition, more than 20 organizations, including CNPC, Shell, Niumag, Huanding, Bruker, Agilent, Oxford Instruments, JSR, and K. C. Wong Education Foundation, Hong Kong, etc. have agreed to provide financial support to this conference. We sincerely appreciate the generous donations from our industry friends and the enthusiastic assistance from the China University of Petroleum (CUP) and other Chinese research institutes. We would also like to thank in advance all the delegates and exhibitors for their interest in presenting their high quality work. We believe that all our attendees will greatly benefit from this conference.
We, the faculty and graduate students from CUP, are honored to organize the 11th ICMRM. CUP specializes in petroleum related researches and education and is one of the best industry-oriented universities in China. NMR is widely used for petroleum and natural gas exploration and recovery in well logging, and in core analysis to measure rock porosity and permeability, or to identify pore fluids. We are delighted to incorporate contributions from the Society of Core Analysts and have created a Joint Topic Conference on NMR in Well Logging and Core Analysis, and will specially focus on unconventional oil and gas core analysis. 相似文献
On behalf of the organizing committee, I would like to invite you to participate in the 11th International Conference on Magnetic Resonance Microscopy (ICMRM), August 14~18, Changping, Beijing, China.
The 11th ICMRM will follow the fine tradition that has been established in 1991 starting with the very first ICMRM in Heidelberg. The conference will be devoted to the latest developments in NMR methods, equipment, and applications of spatially resolved NMR techniques; it is also designed to provide a platform to enhance scientific communication between industry and academia, and between researchers from countries spanning the globe.
We have received more than 130 abstracts from many of the fine NMR laboratories worldwide, and also invited 22 renowned scientists to give presentations on various aspects of NMR, including Sir Paul Callaghan, Prof. Warren S. Warren, Prof. Axel Haase, Prof. Eiichi Fukushima, Prof. Bernhard Blumich and Prof. Bruce Balcom. In addition, more than 20 organizations, including CNPC, Shell, Niumag, Huanding, Bruker, Agilent, Oxford Instruments, JSR, and K. C. Wong Education Foundation, Hong Kong, etc. have agreed to provide financial support to this conference. We sincerely appreciate the generous donations from our industry friends and the enthusiastic assistance from the China University of Petroleum (CUP) and other Chinese research institutes. We would also like to thank in advance all the delegates and exhibitors for their interest in presenting their high quality work. We believe that all our attendees will greatly benefit from this conference.
We, the faculty and graduate students from CUP, are honored to organize the 11th ICMRM. CUP specializes in petroleum related researches and education and is one of the best industry-oriented universities in China. NMR is widely used for petroleum and natural gas exploration and recovery in well logging, and in core analysis to measure rock porosity and permeability, or to identify pore fluids. We are delighted to incorporate contributions from the Society of Core Analysts and have created a Joint Topic Conference on NMR in Well Logging and Core Analysis, and will specially focus on unconventional oil and gas core analysis. 相似文献
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WANG Zhongdong XIAO Lizhi & LIU Tangyan . Petroleum University Beijing China . Liaohe Petroleum Administration Panjin China 《中国科学G辑(英文版)》2004,47(3):265-276
The NMR technique has been widely applied to petroleum well logging and rock core analysis since the 1990s when NUMAR introduced a reliable NMR logging tool to the oil industry. It has been playing an important role for prospecting and exploiting resource of oil and gas for the last ten years. In an oil well, NMR can provide parameters of reservoir and fluid properties, such as porosity, pore size distribution, bound water volume, bulk volume of free water, permeability, in-situ fluid dif… 相似文献
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激光破岩技术是应用光学领域的重要研究方向,它是集合了多相态、多耦合、多尺度的复杂高温、高压物理与化学过程。为了厘清激光破岩研究中的核心难点,给研究者提供有效的理论参考和趋向信息,本文对激光破岩技术的研究概况进行了分析总结。首先明确了激光破岩机理;之后分别从石油井下作业用激光器、激光破岩影响因素、激光破岩的温度场相变传热、物理力学性质以及激光破岩应用可行性等方面对国内外激光破岩技术研究进行了总结分析,指出了现阶段所取得的创新成果和不足;最后阐明了激光破岩技术的优点和发展趋势。研究结果表明,激光破岩技术可在现场配套设施研发、多影响因素评价、多场耦合作用机制和井下适用性理论体系研究等方向着力突破。 相似文献
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13C自旋回波付里叶变换(SEFT)序列脉冲技术与1H去偶技术配合能够简化13C谱,便于识别C、CH、CH2、CH3谱线。本文介绍了用FT-80A NMR谱仪应用其中两种脉冲序列的实验条件并将几种纯烃化合物和混合芳烃样品的实验结果与常用实验技术进行了比较和讨论。 相似文献
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Quantitative NMR imaging of multiphase flow in porous media. 总被引:1,自引:0,他引:1