| 核磁共振T2分布评价岩石孔径分布的改进方法 |
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| 引用本文： | 何雨丹,毛志强,肖立志,任小军.核磁共振T2分布评价岩石孔径分布的改进方法[J].地球物理学报,2005,48(2):373-378. |
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| 作者姓名： | 何雨丹 毛志强 肖立志 任小军 |
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| 作者单位： | 石油大学资源与信息学院， 北京〓102249 |
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| 基金项目： | 中国石油勘探与生产分公司和中国石油天然气集团公司应用基础研究项目 (0 3 0 3 0 1)联合资助 |
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| 摘 要： | 岩芯核磁共振（NMR）T2分布和毛管压力分析数据均在一定程度上反映了岩石的孔隙结构,理论分析表明,这两组数据具有相关性.应用NMR T2分布研究岩石孔径分布，关键是在分析两者的相关性的基础上，从T2分布构造出可靠的毛管压力曲线.但以前用饱和水T2分布构造的毛管压力曲线的方法与实际毛管压力曲线匹配性差.事实上，薄膜束缚水部分的存在引起T2分布反映的孔隙空间与毛管压力曲线反映的孔隙空间有差异.本文提出一种改进方法，在消除薄膜束缚水对T2分布的贡献后，用自由水T2分布构造毛管压力曲线.应用本文方法,对24块岩芯数据自由水T2分布构造的毛管力曲线及其孔喉半径分布与隔板毛管压力分析结果进行了对比.结果表明，改进方法对于毛管压力曲线的构造精度有明显改进，从而为NMR T2分布研究孔隙结构提供了可靠的理论和方法上的支持.
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| 关 键 词： | 核磁共振 T2分布 毛管压力曲线 孔隙结构 |
| 文章编号： | 0001-5733(2005)02-0372-06 |
| 收稿时间： | 2003-09-16 |
| 修稿时间： | 2004-12-01 |
An improved method of using NMR T2 distribution to evaluate pore size distribution |
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| HE Yu-dan,MAO Zhi-qiang,XIAO Li-zhi,REN Xiao-Jun.An improved method of using NMR T2 distribution to evaluate pore size distribution[J].Chinese Journal of Geophysics,2005,48(2):373-378. |
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| Authors: | HE Yu-dan MAO Zhi-qiang XIAO Li-zhi REN Xiao-Jun |
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| Institution: | Faculty of Natural Resources and Information Technology,University of Petroleum, Beijing 102249, China |
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| Abstract: | Both NMR T 2 distribution of core and capillary pressure can be used to characterize pore throat structures of rock in some degree. Theoretical analysis reveals a correlation between these two sets of data. Determining the transferring coefficient between T 2 and p c is the key step when NMR spectra are utilized to study rock pore throat structure. The available methods using T 2 distribution to evaluate capillary pressure curves result in poor correlation with the real capillary pressure curves. In fact, core space reflected by the existence of membrane bound-water T 2 distribution is different from that reflected by capillary pressure curves. The thesis put out an improved method which uses free-water T 2 distribution to construct capillary pressure curves after eliminating membrane bound-water's contribution to T 2 distribution. Applying this method to some core data we did some analysis and comparison. The result shows an improved precision and indicates that this method can provide reliable principle and methodology support for using T 2 distribution to evaluate pore structure. |
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| Keywords: | NMR T 2 distribution Capillary pressure Pore structure |
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