| 地震反射法中薄煤层分辨能力的研究 |
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| 引用本文： | 唐文榜.地震反射法中薄煤层分辨能力的研究[J].地球物理学报,1987,30(6):641-652. |
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| 作者姓名： | 唐文榜 |
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| 作者单位： | 地质矿产部地球物理地球化学勘查研究所, 河北廊坊 |
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| 摘 要： | 本文以非线性地震层状构造理论为基础,对薄层分辨率进行了研究,研究中采用理论计算和合成地震记录,并用超声地震模型试验加以验证。结果表明,薄层可检测性准则,应是它的复合反射波的振幅不小于围岩中较强反射波的振幅。由Farr提出的可检测薄层的极限厚度为λ/12（λ为薄层中地震波波长）,是在薄层顶、底界面反射系数很小时的近似值。指出,当薄层顶、底界面反射系数较大时,如煤层,其可检测性高于Farr定义,且随界面反射系数的增大或频率的提高而提高;适当地提高地震反射波的频率,就能得到厚2-3m薄煤层的大振幅、高信噪比的反射波。上述结论均用煤田地震勘探实例证实。
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| 关 键 词： | 地震勘探 反射 薄层 分辨力 超声地震模型试验 煤 |
| 收稿时间： | 1986-05-22 |
ON RESOLUTION OF A THIN SEAM IN REFLECTION SEISMIC EXPLORATION |
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| TANG WEN-BANG.ON RESOLUTION OF A THIN SEAM IN REFLECTION SEISMIC EXPLORATION[J].Chinese Journal of Geophysics,1987,30(6):641-652. |
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| Authors: | TANG WEN-BANG |
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| Affiliation: | Institute of Geophysical and Gcochemical Exploration, Ministry of Geology and Mineral Resources, Langfang, Hebei |
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| Abstract: | Based on the conception of non-linear seismic bedded structure, the resolution characterizing detectability of a thin bed has been investigated by way of theoretical calculations and synthetic seismogram, which are compared with the ultra-sonic model experiment. The result shows that the limited thickness of a detectable thin bed should be such that the amplitude of composite reflection is not less than the stronger reflection from the surrounding rock, and the limit thickness which is equal to λ/12 （λ--wavelength in the bed） given by Farr is an apposite reflection is not less than the stronger reop/bottom-surface of the thin bed is smaller. It is pointed out that if the reflection coefficient from the surfaces of a thin bed such as a seam is larger, the detectablity is higher than one given by Farr, and it will increase as the reflection coefficient becomes large or the frequency of seismic wave increases. By suitably increasing the frequeney, a large-amplitude and high signal/noise ratio reflection wave from 2-3 m thickness seam can be obtained. This result has been confirmed by practical data of coal seismic prospecting. |
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| Keywords: | Seismic exploration Reflection Thin seam Resolution Ultra-sonic model experiment Coal |
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