基于微动技术探测盆地浅部地层速度结构
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摘要
本文介绍了利用微动技术探测地表浅层速度结构的方法,并在江苏常州地区一个凹陷盆地内进行了一次野外台阵观测试验,采集场地数据的质量良好。利用空间自相关法得到了不同半径下的自相关函数曲线,该场地的自相关函数显示,对于半径较大的台阵,其自相关系数较好;根据自相关函数提取了场地的频散曲线。通过设定初始模型,利用邻域反演算法得到了该场地的基本速度结构和各层深度分布范围;最后通过与场地附近的人工地震剖面进行对比分析表明,试验结果所揭示的土层结构与浅层人工地震勘探解释结果接近。
We introduce the detective method of shallow basin velocity structure based on the microseism technology.A trial test is applied in open field and the data acquired is well.By using the space auto-correlation(SPAC)method of microseism technology,we obtain the auto-correlation ratio of different radius from the test.It is shown that the auto-correlation ratio is well when the radius of ring is large. Phase velocity curve with frequency is calculated from autocorrelation ratio.The model including velocity and depth parameters was inversed by using the neighborhood algorithm. Comparing with the interpretation of seismic reflection profile, the depth parameter of inversion result is much closed to that from the seismic reflection profile.
We introduce the detective method of shallow basin velocity structure based on the microseism technology.A trial test is applied in open field and the data acquired is well.By using the space auto-correlation(SPAC)method of microseism technology,we obtain the auto-correlation ratio of different radius from the test.It is shown that the auto-correlation ratio is well when the radius of ring is large. Phase velocity curve with frequency is calculated from autocorrelation ratio.The model including velocity and depth parameters was inversed by using the neighborhood algorithm. Comparing with the interpretation of seismic reflection profile, the depth parameter of inversion result is much closed to that from the seismic reflection profile.
引文
冯少孔,2003.微动勘探技术及其在土木工程中的应用.岩石力学与工程学报,22(6):1029—1036.
李细兵,范小平,2012.微动技术中运用邻域算法反演地表速度结构.国际地震动态,(6):146—147.
王振东,2006.面波勘探技术要点与最新进展.物探与化探,30(1):1—6.
徐佩芬,凌梗群,2009.微动技术探测煤矿陷落柱的原理方法及效果.地球物理学报,52(7):1923—1927.
Aki K.,1957.Space and time spectra of stationary stochastic wave with special reference to microtre-mors.Bull.Earthq.Res.Inst.,35:415—456.
Bettig B.,Bard P.Y.et.al.,2001.Analysis of dense array noise measurements using the modified spatial auto-correlation method(SPAC):application to the Grenoble area.Bollettino di Geofisica Teorica ed Applicata,42 :285—290.
Capon J.,1969.Application of detection and estimation theory to large array seismology.Proc.IEEE,58:760 —770.
Sambridge M.,1999a.Geophysical inversion with a Neighbourhood Algorithm I:searching a parameter space.Geophys.J.Int.,138:479—494.
Sambridge M.,1999b.Geophysical inversion with a Neighbourhood Algorithm II:appraising the ensemble.Geophys.J.Int.,138:727—746.
李细兵,范小平,2012.微动技术中运用邻域算法反演地表速度结构.国际地震动态,(6):146—147.
王振东,2006.面波勘探技术要点与最新进展.物探与化探,30(1):1—6.
徐佩芬,凌梗群,2009.微动技术探测煤矿陷落柱的原理方法及效果.地球物理学报,52(7):1923—1927.
Aki K.,1957.Space and time spectra of stationary stochastic wave with special reference to microtre-mors.Bull.Earthq.Res.Inst.,35:415—456.
Bettig B.,Bard P.Y.et.al.,2001.Analysis of dense array noise measurements using the modified spatial auto-correlation method(SPAC):application to the Grenoble area.Bollettino di Geofisica Teorica ed Applicata,42 :285—290.
Capon J.,1969.Application of detection and estimation theory to large array seismology.Proc.IEEE,58:760 —770.
Sambridge M.,1999a.Geophysical inversion with a Neighbourhood Algorithm I:searching a parameter space.Geophys.J.Int.,138:479—494.
Sambridge M.,1999b.Geophysical inversion with a Neighbourhood Algorithm II:appraising the ensemble.Geophys.J.Int.,138:727—746.
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