| （T2,D）二维核磁共振测井识别储层流体的方法 |
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| 引用本文： | 谢然红,肖立志.（T2,D）二维核磁共振测井识别储层流体的方法[J].地球物理学报,2009,52(9):2410-2418. |
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| 作者姓名： | 谢然红 肖立志 |
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| 作者单位： | 1.油气资源与探测国家重点实验室，中国石油大学(北京), 北京 102249;2.地球探测与信息技术北京市重点实验室，中国石油大学(北京)，北京 102249 |
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| 摘 要： | 当地层孔隙中油气和水同时存在时，在核磁共振T2分布上不同流体信号往往重叠，很难有效识别.本文采用改变回波间隔测量多组自旋回波串序列实现了（T2,D）二维核磁共振方法，为有效识别储层流体提供了基础.通过数值模拟系统研究了（T2,D）方法在不同储层、不同测量信噪比以及不同外加磁场梯度条件下识别流体的效果.结果表明：（T2,D）方法识别中、低黏度油层具有优势，随着信噪比增加和外加磁场梯度加大，分辨油和水的效果将变好.在气层,对磁场梯度有一定要求，并且，测量数据的信噪比越高，分辨气与水的效果越好，当测量数据信噪比低于70时（T2,D）方法在气层可能失效.在2MHz共振频率下，利用MARAN核磁共振岩芯分析仪器，对含顺磁性物质的饱和流体岩样进行了实验测量，验证了（T2,D）方法的有效性.
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| 关 键 词： | 二维核磁共振 测井 T2分布 储层评价 流体识别 内部磁场梯度 |
| 收稿时间： | 2008-10-28 |
| 修稿时间： | 2009-9-1 |
The （T2,D） NMR logging method for fluids characterization |
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| XIE Ran-Hong,XIAO Li-Zhi.The （T2,D） NMR logging method for fluids characterization[J].Chinese Journal of Geophysics,2009,52(9):2410-2418. |
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| Authors: | XIE Ran-Hong XIAO Li-Zhi |
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| Institution: | 1.State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;2.Key Laboratory of Earth Prospecting and Information Technology, China University of Petroleum (Beijing), Beijing 102249, China |
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| Abstract: | When oil, gas, and water are present in rock simultaneously, their signals on T2 distributions of nuclear magnetic resonance (NMR) usually overlap each other. Therefore it is difficult to differentiate them by one-dimensional NMR logging. In this work, the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence echo train data with multiple echo spacing is used to realize the （T2,D） two-dimensional NMR logging method. The performance of the （T2,D） two-dimensional NMR method for identifying fluids in different kinds of reservoirs, signal-to-noise ratios, and magnetic field gradient are studied in detail through numerical simulation. The results show that the （T2,D） method is capable of recognizing oil reservoirs of low and mediate viscosity. With increasing ratio of signal to noise (SNR) and gradients of the outside magnetic field, it can discriminate oil and water better. For gas reservoirs, this method has some requirement to the magnetic field gradients for their values. And with the increasing of SNR, the （T2,D） method can distinguish gas and water to a better degree. When the SNR of data is less than 70, it probably does not work for gas reservoirs. The （T2,D） experiments on fluid saturated rock samples with paramagnetic impurities were performed using a MARAN NMR spectrometer at a proton resonance frequency of 2MHz. The effectiveness of the （T2,D） method has been verified. |
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| Keywords: | Two-dimensional NMR Logging T2 distribution Formation evaluation Fluids characterization Internal magnetic field gradient |
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