| 煤矿巷道内地震勘探波场特征 |
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| 引用本文： | 李桂花,朱光明,李桂亮.煤矿巷道内地震勘探波场特征[J].煤田地质与勘探,2009,37(5):54. |
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| 作者姓名： | 李桂花 朱光明 李桂亮 |
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| 作者单位： | 1. 山东科技大学地质科学与工程学院, 山东 青岛 266510; |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目 |
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| 摘 要： | 为了研究巷道内地震波的波场特征,识别出波场中的各种波,利用交错网格高阶有限差分正演方法模拟了煤矿巷道内点震源激发及平面波震源激发产生的弹性波场。通过波场分析得出煤矿巷道内的共炮点道集中除了有常规地面地震中的各种波外,还有在巷道内上下界面的多次反射波和多次折射转换波,是巷道内地震勘探的主要干扰波。利用平面波震源在巷道内激发产生的波场中,巷道下方的空洞在平面波震源激发的地震记录上,其多次反射绕射波互相叠合在一起,表现为“糖葫芦”状的明显异常特征。这些都为巷道内地震勘探资料处理和解释提供了重要依据。
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| 关 键 词： | 巷道 弹性波 三分量 交错网格高阶有限差分 波场特征 |
| 收稿时间： | 2009-01-06 |
Wave field characteristics of seismic survey in coal mine roadway |
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| LI Guihua,ZHU Guangming,LI Guiliang.Wave field characteristics of seismic survey in coal mine roadway[J].Coal Geology & Exploration,2009,37(5):54. |
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| Authors: | LI Guihua ZHU Guangming LI Guiliang |
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| Institution: | 1. School of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China;2. College of Geological Engineering and Geomatics of Chang'an University, Xi'an 710054, China;3. College of Petroleum Engineering, X i'an Shiyou University, Xi'an 710065, China |
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| Abstract: | In order to study the wave field characteristics of seismic survey in coal mine roadway,and distinguish different type of waves in the wave field,with the staggered-grid high order finite difference wave field simulation method,this papar simulates the elastic wave field stimulated with point-source or plane wave source in the coal mine roadway.By the wave field analysis,it indicated that in the common point gather the waves not only have various waves of conventional seismic,but also have multi-reflection and multiple refraction propagating between the top interface and the lower interface,which are the main interference wave.In the seismic records of plane wave source the cavity underneath the roadway shows as a obviously unusual “candied fruit".The result of wave field analysis provided a important basis for the seismic survey method and a effective way to estimate possibly achieved regarding effect. |
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