内蒙古准苏吉花矿区岩矿石物性与地震波组特征研究

Characteristics of Seismic Waves and Physical Properties of Rocks and Minerals in the Zhunsujihua Mine of Inner Mongolia

在金属矿地震勘探中,岩矿石弹性参数尤为重要。为更好地开展金属矿地震方法技术试验研究,本文对内蒙古准苏吉花矿区的钻孔岩心标本进行了密度和速度测试,在此基础上,开展了金属矿地震方法试验。根据获得的试验区岩矿石弹性参数测试结果,讨论了不同岩矿石的反射系数和速度与密度之间的关系。研究结果表明:花岗闪长岩(岩体)与变质粉砂岩(围岩)之间的反射系数较弱,不足以产生能够识别的反射信号。在花岗闪长岩(岩体)内部,闪长岩(脉)、矿化花岗闪长岩、铜钼矿体与花岗闪长岩之间具有较强的反射系数,能够产生可识别的反射波。铜钼矿化花岗闪长岩的密度较高,速度较低,表明在金属矿区,矿石的速度并不一定随密度的增加而增加。利用所获得岩矿石弹性参数和地质资料,对获得的试验地震剖面进行了解释,根据L2试验剖面上的地震波组特征,认为在该剖面以外NE一侧,有可能寻找到深部隐伏金属矿。

In seismic prospecting for metal ores, elastic pttrameters of rocks anti minerals are particularly important. This work measured the density and velocity of drill core samples from the Zhunsujihua copper-molybdenum mine in Inner Mongolia, and carried out experiments on the seismic methmls on the basis of tiese parameters. Based on the elastic parameters of rocks and minerals in the survey area, the reflection coefficients focks anti minerals and Ihe relationship between velocity and density were analyzed. The resuhs indicate that reflection coefficient between the granmliorite and metamorphiv sihstone is weak, not enough to generate identified reflected signal. The reflection coefficients among diorite （vein） , mineralized granodiorite, copper-nn lybdenum ore bodies and granodiorite are strong enough to produce recognizable reflected signal in granodiorite. The density nf copler-molybdeoum miner- alized granodiorite is high, but its velocity is low. This indicates that ore velocity does not necessarily ine.reases with the increasing density in the mining area. The experimental seisntie sections were explained using the geological data and the obtained elastic parameters of rocks and minerals. It can he in- ferred that the deep hidden metal ores can he st＇arched on the NE side of outside the L2 section based on the characleristics of reflections on the L2 seismitc profile.