饱和砂岩的滞弹性弛豫衰减特征及微观机理的探索

席道瑛; 徐松林; 刘永贵; 杜赟

doi:10.7498/aps.61.149101

摘要

应用Metravib热机械分析仪,以饱和岩石进行正弦波加载的方式, 分别对三种不同孔隙度的泵油饱和彭山砂岩、泵油和甘油饱和自贡长石砂岩进行了衰减实验研究,得到衰减的热弛豫规律.据此规律求得它们的激活能和原子振动频率, 其激活能和原子的振动频率比间隙原子的激活能和振动的频率低, 此现象用饱和砂岩中产生的缺陷原子簇的整体振动比单个或孤立的原子的振动频率低做出了解释. 在饱和岩石的晶粒间界缺陷处参与扩散的是固体原子、液体及气体原子. 并得出随孔隙度和黏滞系数增大,衰减强度和激活能增大,原子的振动频率增高,弛豫时间减小的结论. 在正弦波应力作用下,由多种矿物晶体胶结而成的饱和砂岩是一种多晶、多相的固体, 由于内部结构复杂、缺陷广布,产生弛豫衰减是普遍现象.砂岩中存在点缺陷、位错、晶界及孪晶界面等许多缺陷及缺陷间的相互作用都可以产生弛豫型衰减峰. 用饱和砂岩中特有的饱和液体及砂岩内部结构的复杂性解释了饱和砂岩的衰减机理, 很自然地将其宏观衰减特征与微观结构紧密连在一起.饱和砂岩中的各种缺陷、相界等会导致多重弛豫,使它们的弛豫衰减峰变宽,分布参数增大.这项研究既具有理论意义,也具有实用价值.

关键词:

Abstract

Attenuation experiments are performed by Metravib dynamic mechanical analyzer with sine wave loading style to study the viscoelastic relaxation property of pump-oil saturated and glycerol saturated Pengshan sandstone and Zigong arkoses with three kinds of porosities. Based on the thermal relaxation regularities, the activation energies and the atomic vibration frequencies of relaxation attenuation peaks for three kinds of saturated sandstones are evaluated. The results show that activation energies and atomic vibrations frequencies of sandstone samples are lower than those of interstitial atoms. The overall vibration behavior of atomic cluster with defects can be used to explain why vibration frequencies are low in samples. Besides the solid atoms, the gas and liquid atoms filled in defects contribute greatly to overall vibration of sample. Saturated sandstone, cemented by a combination of mineral crystals, is a polycrystalline, multiphase solid with internal complex structure and widespread defects, and it easily takes on thermal relaxation property under sine wave loading. Such flaws and defects as point defects, dislocation and grain boundary in samples and their interaction interaction can produce relaxation attenuation peak. To explain the relaxation mechanism by saturated liquid and internal structure of the sandstone, it is natural to relate the attenuation characteristics to its macro-meso-structure. It is notable that when taking the defects, multiple phase boundary into consideration, a new interesting phenomenon appears, there produces multi relaxation with broader peak and more widely distributed parameter. This investigation is helpful to study theoretical model and seismic data interpretation.

Keywords:

作者及机构信息

1.
中国科学技术大学蒙城地球物理国家野外观测站,地球和空间科学学院, 合肥 230026;

2.
中国科学技术大学中国科学院材料力学行为和设计重点实验室, 合肥 230027

基金项目: 国家自然科学基金(批准号: 40874093)资助的课题.

Authors and contacts

1.
Mengcheng National Geophysical Observatory, School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China;

2.
CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 40874093).

参考文献

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[13]	Carmeliet J, Koen E A, van Den Abeele K E A 2002 Geophys. Res. Lett. 29 1144
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[16]	Mavko G M, Nur A 1979 Geophysics 44 161
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[18]	Xi D Y, Yi L K, Tian X Y 2003 Chinese J. Geophysics 46 814
[19]	Xi D Y, Xu S L, Du Y, Yi L K 2011 J. Appl. Geophys. 71 289
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施引文献

[1]	Winkler K W, Nur A 1982 Geophysics 47 1
[2]	Jones T D 1986 Geophysics 51 1939
[3]	Jones T, Nur A 1983 Geophys. Res. Lett. 10 140
[4]	Xi D Y, Liu X Y, Zhang C Y 2007 Pure. Appl. Geophys. 164 2157
[5]	Guyer R A, TenCate J, Johnson P 1999 Phys. Rev. Lett. 82 3280
[6]	Johnson P A, McCall K R 1994 Geophys. Res. Lett. 21 97
[7]	Xi D Y, Chen Y P, Tao Y Z, Liu Y C 2006 Chinese J. Rock Mech. Engng. 25 1086 (in Chinese) [席道瑛, 陈运平, 陶月赞, 刘亚晨 2006 岩石力学与工程学报 25 1086]
[8]	Xi D Y, Xu S L, Xi J, Yi L K, Du Y 2011 Chinese J. Geophys. 54 2302 (in Chinese) [席道瑛, 徐松林, 席军, 易良坤, 杜赟 2011 地球 54 2302]
[9]	Tutuncu A N, Podio A L, Gregory A R 1998 Geophysics 63 195
[10]	McCall K R, Guyer R A 1994 J. Geophys. Res. 99 23887
[11]	van Den Abeele K E A, Carmeliet J, Johnson P A, Zinszner B 2002 J. Geophys. Res. 107 2121
[12]	Carmeliet J, van Den Abeele K E A 2001 Fourth International Conference on Fracture Mechanics of Concrete and Concrete Structures Cachan, France, 28 May 2011 pp11-18
[13]	Carmeliet J, Koen E A, van Den Abeele K E A 2002 Geophys. Res. Lett. 29 1144
[14]	Xi D Y, Du Y, Yi L K, Wan X L 2009 Chinese J. Rock Mech. Engng. 28 687 (in Chinese) [席道瑛, 杜赟, 易良坤, 宛新林 2009 岩石力学与工程学报 28 687]
[15]	Pennington W D 1997 The Leading EDGE 16 241
[16]	Mavko G M, Nur A 1979 Geophysics 44 161
[17]	O'Connell R J 1983 Am. Inst. Phys. Conference on Physics and Chemistry of Porous Media, Schlumberger-Doll Research, Johnson D L, Sen P N (Ed.) Am. Inst. Phys: pp166-176
[18]	Xi D Y, Yi L K, Tian X Y 2003 Chinese J. Geophysics 46 814
[19]	Xi D Y, Xu S L, Du Y, Yi L K 2011 J. Appl. Geophys. 71 289
[20]	Du Y, Xi D Y, Xu S L 2009 Chinese J. Geophys. 52 3051 (in Chinese) [杜赟, 席道瑛, 徐松林 2009 地球 52 3051]
[21]	Zinszner B, Johnson P A, Rasolofosaon P N J 1997 J. Geophys. Res. 101 8105
[22]	Xi D Y, Liu B, Yi L K 2000 Chinese J. Geophys. 43 873
[23]	Xi D Y, Liu B, Tian X Y 2002 Chinese J. Geophys. 45 101
[24]	Vo-Thanh D 1995 Geophys. J. Int. 121 737
[25]	Batzle M L, Han D H, Hofmann R 2006 Geophysics 71 N1
[26]	Batzle M, Han D, Castagna J 1996 Soc. Expl. Geoph. Expanded Abstracts 1687
[27]	O'Doherty R F, Anstey N A 1971 Geophys. Prospecting 19 430
[28]	Huang K 1979 Solid Physics (Beijing: People's Education Press) pp66-67 (in Chinese) [黄昆 1979 固体物理学 (北京:人民教育出版社) 第66—67页]

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