利用倾斜截面的反射波测定覆盖层的波速
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摘要
波速测量得到的是一段地层中的平均速度,由于地震波初至时刻难于准确确定等原因,测量结果存在较大误差.采用共反射点的多次覆盖技术能更准确地测定地震波的传播速度,但必须准确掌握反射面的深度.在不准确掌握反射面厚度的情况下,提出利用倾斜截面测定波速.这种技术要求掌握反射截面的倾角,特别适合有断层出露和基岩出露的地区.把上述技术应用于龙门山断层区,测得了该区地震波传播速度,说明利用倾斜反射截面测定波速是有价值的尝试.
The measurement result of wave velocity is earthquake wave average velocity in stratum,because original reach time of earthquake wave is difficult to be decided,measurement result has more deviation.Earthquake wave velocity can be computed more accurately with common reflection point multiple cover technique,but,the deep of reflection section needs to be know accurately.In the condition of the deep of reflection section is not known accurately,it is put forward to measure wave velocity by mean of reflection wave on dip section.This technique need to know the dip angle of reflection section,so,It is more useful in the areas that the fault or exposure expose.We use above technique to Longmenshan fault areas,earthquake wave velocity is obtained,it is valuable to measure wave velocity by mean of reflection wave on dip section.
The measurement result of wave velocity is earthquake wave average velocity in stratum,because original reach time of earthquake wave is difficult to be decided,measurement result has more deviation.Earthquake wave velocity can be computed more accurately with common reflection point multiple cover technique,but,the deep of reflection section needs to be know accurately.In the condition of the deep of reflection section is not known accurately,it is put forward to measure wave velocity by mean of reflection wave on dip section.This technique need to know the dip angle of reflection section,so,It is more useful in the areas that the fault or exposure expose.We use above technique to Longmenshan fault areas,earthquake wave velocity is obtained,it is valuable to measure wave velocity by mean of reflection wave on dip section.
引文
Chen X G.Tian J Y.Wang E F.et al.2007.Wave-velocity logging based on wavelet analysis[J].Journal of Earthquake Engineering and Engineering Vibration(in Chinese),27(1):159-163.
Chen Z H.Wang X T,Du S H.1993.Geophysics Prospection Course of Engineering and Environment(in Chinese)[M].Beijing:Geology Press,32-46.
Hou X M.Bo J S.Yang X S.et al.2004.Applications of correlation function in shear-velocity measurement of single-hole method[J].Journal of Earthquake Engineering and Engineering Vibration(in Chinese).24(2):59-63.
Liu M J.Li S L.Fang S M.et al.2008.Study on crustal composition and geodynamics using seismic velocities in the north eastern margin of the Tibetan plateau[J].Chinese Journal of Geophysics(in Chinese),51(2):412-430.
Lu J M.2001.Principle of Seismic Exploration(in Chinese)[M].Dongying:Oil University Press,5-9.
Ma M N,Bai W M,Wu X Y.2002.Study on elastic wave velocities of crustal rocks under high temperature and high pressure conditions[J].Progress in Geophysics(in Chinese),17(4):684-689.
Zhang W,He Z Q,Hu G,et al.2013.Detection of the shallow velocity structure with surface wave prospection method[J].Progress in Geophysics(in Chinese),28(4):2199-2206,doi:10.6038/pg20130467.
Zhao P.1995.Studies of the relationship between seismic velocity and heat production in the rocks of crust[J].Progress in Geophysics(in Chinese),10(1):114-124.
陈旭庚,田家勇,王恩福,等.2007.基于小波分析的场地波速测量方法[J].地震工程与工程振动,27(1):159-163.
陈仲侯,王兴泰,杜世汉.1993.工程与环境物探教程[M].北京:地质出版社:32-46.
侯兴民,薄景山,杨学山,等.2004.互相关函数在单孔法剪切波速测量中的应用[J].地震工程与工程振动,24(2):59-63.
刘明军,李松林,方盛明,等.2008.利用地震波波速研究青藏高原东北缘地壳组成及其动力学[J].地球物理学报,51(2):412-430.
陆基孟.2001.地震勘探原理[M].东营:石油大学出版社:5-9.
马麦宁,白武明,伍向阳.2002.10.6~1.5 GPa、室温~1200℃条件下青藏高原地壳岩石弹性波速特征[J].地球物理学进展,17(4):684-689.
张维,何正勤,胡刚,等.2013.用面波联合勘探技术探测浅部速度结构[J].地球物理学进展,28(4):2199-2206,doi:10.6038/pg20130467.
赵平.1995,地震波速与地壳岩石生热率关系的研究评述[J].地球物理学进展,10(1):114-124.
Chen Z H.Wang X T,Du S H.1993.Geophysics Prospection Course of Engineering and Environment(in Chinese)[M].Beijing:Geology Press,32-46.
Hou X M.Bo J S.Yang X S.et al.2004.Applications of correlation function in shear-velocity measurement of single-hole method[J].Journal of Earthquake Engineering and Engineering Vibration(in Chinese).24(2):59-63.
Liu M J.Li S L.Fang S M.et al.2008.Study on crustal composition and geodynamics using seismic velocities in the north eastern margin of the Tibetan plateau[J].Chinese Journal of Geophysics(in Chinese),51(2):412-430.
Lu J M.2001.Principle of Seismic Exploration(in Chinese)[M].Dongying:Oil University Press,5-9.
Ma M N,Bai W M,Wu X Y.2002.Study on elastic wave velocities of crustal rocks under high temperature and high pressure conditions[J].Progress in Geophysics(in Chinese),17(4):684-689.
Zhang W,He Z Q,Hu G,et al.2013.Detection of the shallow velocity structure with surface wave prospection method[J].Progress in Geophysics(in Chinese),28(4):2199-2206,doi:10.6038/pg20130467.
Zhao P.1995.Studies of the relationship between seismic velocity and heat production in the rocks of crust[J].Progress in Geophysics(in Chinese),10(1):114-124.
陈旭庚,田家勇,王恩福,等.2007.基于小波分析的场地波速测量方法[J].地震工程与工程振动,27(1):159-163.
陈仲侯,王兴泰,杜世汉.1993.工程与环境物探教程[M].北京:地质出版社:32-46.
侯兴民,薄景山,杨学山,等.2004.互相关函数在单孔法剪切波速测量中的应用[J].地震工程与工程振动,24(2):59-63.
刘明军,李松林,方盛明,等.2008.利用地震波波速研究青藏高原东北缘地壳组成及其动力学[J].地球物理学报,51(2):412-430.
陆基孟.2001.地震勘探原理[M].东营:石油大学出版社:5-9.
马麦宁,白武明,伍向阳.2002.10.6~1.5 GPa、室温~1200℃条件下青藏高原地壳岩石弹性波速特征[J].地球物理学进展,17(4):684-689.
张维,何正勤,胡刚,等.2013.用面波联合勘探技术探测浅部速度结构[J].地球物理学进展,28(4):2199-2206,doi:10.6038/pg20130467.
赵平.1995,地震波速与地壳岩石生热率关系的研究评述[J].地球物理学进展,10(1):114-124.
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