反射槽波探测采空巷道的实验与方法
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摘要
对利用反射槽波探测工作面内异常构造展开实验研究,针对实际井下地震数据中反射槽波受直达槽波与其他波场干扰严重的问题,提出了基于最小平方反褶积的反射槽波增强算法和基于径向道变换的方法压制直达槽波与巷道声波,并用绕射偏移的方法获得工作面内巷道的成像结果。实验结果表明:槽波传播过程中遇采空巷道能够产生较强的反射槽波,通过处理可获得采空巷道的成像结果;反射槽波的传播距离可达360 m以上,探测距离可达200 m以上。
An experiment on using reflected in-seam wave to detect abnormal geological structure in a working face was conducted. To overcome the interference of direct in-seam wave and other types of waves to the reflected in-seam wave,an enhancement method was proposed based on the least squares deconvolution algorithm to focus the reflected in-seam wave. The radial trace transformation and filtering were used to suppress the direct wave and the sound wave.An image of a roadway in the tested working face was generated by diffract migration. The results show that the reflected in-seam wave can be generated when the propagating in-seam waves encounter with a void roadway and the roadway can be imaged after the data are processed. The propagation distance of the reflected inseam is over 360 m,and the detection range is over 200 m.
An experiment on using reflected in-seam wave to detect abnormal geological structure in a working face was conducted. To overcome the interference of direct in-seam wave and other types of waves to the reflected in-seam wave,an enhancement method was proposed based on the least squares deconvolution algorithm to focus the reflected in-seam wave. The radial trace transformation and filtering were used to suppress the direct wave and the sound wave.An image of a roadway in the tested working face was generated by diffract migration. The results show that the reflected in-seam wave can be generated when the propagating in-seam waves encounter with a void roadway and the roadway can be imaged after the data are processed. The propagation distance of the reflected inseam is over 360 m,and the detection range is over 200 m.
引文
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[15]余波,黄中玉,谈大龙,等.径向道滤波法去线性干扰[J].石油物探,2005,44(2):109-112.Yu Bo,Huang Zhongyu,Tan Dalong,et al.RT filter attenuating the linear noise[J].Geophysical Prospecting for Petroleum,2005 44(2):109-112.
[2]Zhao Yonggui,Jiang Hui,Zhao Xiaopeng.Tunnel seismic tomography method for geological prediction and its application[J].Applied Geophysics,2006,3(2):69-74.
[3]Mason I M,Buchanan D J,Booer A K.Fault location by underground seismic survey[J].IEEE Proc.,2006,127:322-366.
[4]Buchanan D J.Fault location by channel wave seismology in United Kingdom coal seams[J].Geophysics,1981,46:994-1002.
[5]Buchanan D J.In-seam seismology:A method for detecting faults in coal seams[A].Underground Geophysics of Coal Seams[C].London and New York:Applied Science Publischers,1983.
[6]Dresen L,Ruter H.Seismic coal exploration,part B:in-seam seismics[M].New York:Pergamon Press,1994:388-394.
[7]Hu Y,Mc Mechan G.Imaging mining hazards within coal beds using prestack wave equation migration of in-seam seismic survey data:A feasibility study with synthetic data[J].Journal of Applied Geophysics,2007,63:24-34.
[8]王伟,高星,李松营,等.槽波层析成像方法在煤田勘探中的应用——以河南义马矿区为例[J].地球物理学报,2012,55(3):1054-1062.Wang Wei,Gao Xing,Li Songying,et al.Channel wave tomography method and its application in coal mine exploration:An example from Henan Yima mining area[J].Chinese Journal of Geophysics,2012,55(3):1054-1062.
[9]Lu Wenkai,Wang Ji,Cheng Jianyuan.Channel wave tomography for detecting inhomogeneties in coal seam:A real dataset example[A].75th EAGE Conference&Exhibition Incorporating SPE EUROPEC[C].UK:Ex Cel,London,2013.
[10]程建远.典型含煤模型Love型槽波的频散特征分析[J].煤炭学报,2012,37(1):68-72.Cheng Jianyuan.Love channel-waves dispersion characteristic analysis of typical coal models[J].Journal of China Coal Society,2012,37(1):68-72.
[11]刘天放,潘冬明,李德春,等.槽波地震勘探[M].徐州:中国矿业大学出版社,1994.
[12]Booer A K.Underground geophysics of coal seams,developments in geophysical exploration methods[M].London:Applied Science Publishers,1982.
[13]张平松,刘盛东,吴健生.坑道掘进空间反射波超前探测技术[J].煤炭学报,2010,35(8):1331-1335.Zhang Pingsong,Liu Shengdong,Wu Jiansheng.Tunnel reflection wave imaging technology and its system during driving space[J].Journal of China Coal Society,2010,35(8):1331-1335.
[14]刘志鹏,陈小宏,李景叶.径向道变换压制相干噪声方法研究[J].地球物理学进展,2008,23(4):1199-1204.Liu Zhipeng,Chen Xiaohong,Li Jingye.Study on coherent noise attenuation using radial trace transform filtering[J].Progress in Geophysics,2008,23(4):1199-1204.
[15]余波,黄中玉,谈大龙,等.径向道滤波法去线性干扰[J].石油物探,2005,44(2):109-112.Yu Bo,Huang Zhongyu,Tan Dalong,et al.RT filter attenuating the linear noise[J].Geophysical Prospecting for Petroleum,2005 44(2):109-112.