戈壁地区煤田野外地震勘探资料采集的技术难点分析与对策
Technical Difficulty Analysis and Countermeasures for Field Data Gathering of Seismic Exploration for Coal in Gobi District
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摘要: 针对戈壁地区松散的砾石层地震信号衰减快、频率降低和能量减弱的特点,以及煤层倾角大、煤层埋藏深度变化大和潜水面的影响,笔者对戈壁地区煤田地震勘探的野外采集技术难点进行了分析探讨,并提出相应的技术对策:①地表条件复杂、潜水位变化大的地区采用汽车钻机成孔。②煤层埋藏深度小、倾角小于15°的地区采取小排列、小药量、中点放炮激发。③煤层埋藏深度大、倾角大于15°的地区采取大排列,能量足够情况下,采用小药量、端点放炮激发。最后通过实例补充说明。Abstract: In Gobi area with loose gravel bed,the seismic signal attenuates fast,making frequency and energy be lowered;in addition,the coal seam has a chang eable buried depth and steep dipangle.Aiming at this problem,we analyzed the difficulties of gat hering seismic data in coal field and proposed some corre-sponding technical countermeasures:Using car-drill into a hole in complex surface where has complex conditions and changeable water table;in the area where the burial depth of coal seam is shallow and the dipangle is less than 45°,a small order,a small amount of explosives,and mid-point shooting excitation are used;in the area where the burial depth of coal seamis big and the dipangle issteeper than 45°, a large orde,a small amount of explosives,and the endpoint excitation are used.
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Key words:
- Gobi district /
- Seismic survey /
- technical difficulty /
- counterm easure
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