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火山岩束缚水饱和度核磁共振测量方法

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科技导报 | 研究论文 2011,29(11-05): 24-27

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科技导报 | 研究论文 2011, 29(11-05): 24-27

火山岩束缚水饱和度核磁共振测量方法

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^{周宇1，郭和坤2，魏国齐2，李海波2}

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通讯作者:

周宇

Irreducible Water Saturation Measurement of Volcanic Rocks Using Nuclear Magnetic Resonance

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出版时间: 2011-02-18 doi: 10.3981/j.issn.1000-7857.2011.05.002

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束缚水饱和度是油气储层计算储量、分析产出流体类型的关键参数。火山岩储层具有岩性多样、孔隙结构复杂、非均质性强等特点，必须通过对全直径岩心进行分析，才能获得比较准确的束缚水饱和度。常规方法分析全直径岩心束缚水饱和度，存在测试周期长、样本难以获取以及可能产生黏性指进等问题。采用核磁共振技术结合离心实验技术，用小岩心测量得到的可动流体T2截止值标定全直径岩心T2谱，进而得到全直径岩心束缚水饱和度的实验新方法，解决了常规方法测试存在的问题。对比核磁共振方法与驱替实验所得全直径岩心束缚水饱和度，结果表明，对均质性较好、不含裂缝或微裂缝的火山岩岩心，核磁共振方法与驱替实验测量得到的结果吻合较好；对含有裂缝或微裂缝的火山岩岩心，核磁共振方法由于避免了指进现象，测得的束缚水饱和度不受裂缝、微裂缝的影响。

关键词

束缚水饱和度 / 火山岩 / T2截止值 / 核磁共振 / 离心实验

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Irreducible water saturation is one of the fundamental parameters for characterizing reservoir formations, and the key factor for determining reserve calculation and fluid type identification. CT analysis on 125 whole cores shows that volcanic rocks have the complex porous structure and possess strong heterogeneity. As a result, accurate Swi can be only measured on whole cores. A new testing method for whole cores is proposed by combining Nuclear Magnetic Resonance(NMR) with centrifugal tests. Using T2 spectrum of whole core demarcated by a T2 cutoff, this new method measures irreducible water saturation. The T2 cutoff is measured on 25mm or 38mm diameter core samples which drilled from the whole core. Experiments on 52 volcanic rocks show that although the measured T2 cutoff values vary greatly among different volcanic rock types, but there is little difference between the values in the same group of volcanic rocks sub-classified by lithology. And NMR method can provide reliable measurements when it is applied to Sw measurement of volcanic rocks if the T2 cutoff is measured on cores from the same group sub-classified by lithology. The new method overcomes the problems involving size and shape restricts, long test cycles, and viscous fingering defects of conventional methods. Comparing with conventional method, the results of the new method well coincide with the experimental results on homogeneous rocks, and are more accurate with fractured samples.

Key words

irreducible water saturation / volcanic rock / T2 cutoff / NMR / centrifugal tests

引用本文

周宇;郭和坤;魏国齐;李海波. 火山岩束缚水饱和度核磁共振测量方法. 科技导报, 2011 , 29 (11-05) : 24 -27 . DOI: 10.3981/j.issn.1000-7857.2011.05.002

. Irreducible Water Saturation Measurement of Volcanic Rocks Using Nuclear Magnetic Resonance[J]. Science & Technology Review, 2011 , 29 (11-05) : 24 -27 . DOI: 10.3981/j.issn.1000-7857.2011.05.002

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2011年第29卷第11-05期

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doi: 10.3981/j.issn.1000-7857.2011.05.002

接收时间：2010-12-03
首发时间：2011-02-18
出版时间：2011-02-18

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收稿日期：2010-12-03
修回日期：2011-01-21

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通讯作者:

周宇

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https://castjournals.cast.org.cn/joweb/kjdb/CN/10.3981/j.issn.1000-7857.2011.05.002

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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