【摘要】 在金川公司龙首矿东采区1 280中段井下500m深的巷道中应用地震CT技术进行寻找深部隐伏矿体的实验。波速图像表明,研究区内中西部有一高速异常区,推断为花岗岩体和含矿的超基性侵入岩体。区内还有一个横贯测区中央近东西走向的低速断裂带。这些推断结果为后期的钻探和巷道开掘所证明。更多还原

【Abstract】 Mining application of Seismic Tomography in Jinchuan Longshou Mine is the frist test in China. The prospecting test conducts in the depth of 500m underground and covers an area of 300m×300m. The seismic velocity which is selected as image variable is more sensitive to ore bearring rock. The equipment used is ES-2401X 48-channel Seismograph. The acquisition frequency bandwidth is selected from 400Hz to 4000Hz. The test area is divided into total 81×64 elements, with individual size of 4m×4m. The intervals both of receivers and shots are 4m. The prospecting resolution is 2.5m. The seismic waves are excited by dynamite source of 50g. Tolal 165 effective shots are available and 7619 seismic rays are calculated into velocity image. The seismic velocity image shows there is a high velocity zone of 5.0—6.5km/s in the middle west of the area. It is deduced to be high density intrusive rocks, such as bultrabasic intrusive rock, Ni-Cu ore bearring, and granite masses. This zone consists of. two parts, northern and southern. The northern part is confirmed by drilling as to be granite. The west of the southern part is verified as to be Ni-Cu ore bearring bultrabasic rock, the east of the southern part is discovered to be granite, too, during the gallery exploritation. And there is an E-W-trending low velocity belt which is interpreted as a fault. The late drilling shows the deduction correct. These facts show that the application of seismic tomography technique has a bright future in the mining aspect.更多还原