煤田陷落柱的超声模拟分析
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摘要
通过超声波模拟试验,研究了煤层陷落柱的反射波组和绕射波组特征以及绕射波组对反射波组特征的影响。结果表明,煤田高分辨率地震勘探资料在目的层埋深200~500m时,经过三维偏移后,可以将菲涅耳带半径收缩到1/5~1/3,能够准确地解释直径大于30m的陷落柱;对直径为15~30m的陷落柱解释结果也较为可靠,有效地提高了勘探精度。
The study and explanation of coalfield collapse columns, especially of small ones, constitute a key factor in coal mine safe production. However, it is very difficult to explain small coal collapses by seismic data of field reflection and refraction waves in practical production. In this paper, the characteristics of reflection and refraction wave sets and the influence of reflection wave set to refraction wave set are studied for coalfield collapse columns on the basis of ultrasonic simulation tests. The results show that coalfield high-resolution seismic data can reduce the radius of Fresnel zone to 1/5~1/3 for the target buried in the depth of 200~500 m, and interpret accurately collapse columns with diameters longer than 30m. Reliable explanation results can also be obtained for collapse columns with diameters of 15~30m. Therefore, the exploration precision is obviously improved.
The study and explanation of coalfield collapse columns, especially of small ones, constitute a key factor in coal mine safe production. However, it is very difficult to explain small coal collapses by seismic data of field reflection and refraction waves in practical production. In this paper, the characteristics of reflection and refraction wave sets and the influence of reflection wave set to refraction wave set are studied for coalfield collapse columns on the basis of ultrasonic simulation tests. The results show that coalfield high-resolution seismic data can reduce the radius of Fresnel zone to 1/5~1/3 for the target buried in the depth of 200~500 m, and interpret accurately collapse columns with diameters longer than 30m. Reliable explanation results can also be obtained for collapse columns with diameters of 15~30m. Therefore, the exploration precision is obviously improved.
引文
[1]董其成.岩溶陷落柱对综采经济效益的影响[ J].煤炭科学技术,1989(8).
[2]董其成.陷落柱的波场特征研究[D ].北京:中国矿业大学,1992.
[3]杨双安.时间剖面上分析陷落柱充水性的探讨[ J].中国矿业大学学报.2001,(5):503-505.
[4]张爱敏.采区高分辨率三维地震勘探[M ].北京:中国矿业大学出版社,1997.
[5] Sheriff. Nomogram for Fresnel Zone Cacu lation [ J]. Geophysics,1980,45(May):968-972.
[6] Berkhout A J. Seism ic Resolution London -Am sterdam [ J]. Geo-physical Press,1984.
[2]董其成.陷落柱的波场特征研究[D ].北京:中国矿业大学,1992.
[3]杨双安.时间剖面上分析陷落柱充水性的探讨[ J].中国矿业大学学报.2001,(5):503-505.
[4]张爱敏.采区高分辨率三维地震勘探[M ].北京:中国矿业大学出版社,1997.
[5] Sheriff. Nomogram for Fresnel Zone Cacu lation [ J]. Geophysics,1980,45(May):968-972.
[6] Berkhout A J. Seism ic Resolution London -Am sterdam [ J]. Geo-physical Press,1984.
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