不同地质背景下EH-4的应用效果

The application effect of EH-4 under different geological backgrounds

EH-4的应用效果受采集频段、地质及地球物理条件的影响。为了判断在地质物探工作中选择EH-4是否合理,分析了EH-4在连山关硬岩型铀矿勘查、二连盆地砂岩型铀矿勘查及新疆伊利盆地采空区工程勘查中的应用效果,认为在硬岩地区,EH-4的勘查深度普遍能达到1 000 m左右,且其对探测断裂和岩体接触带的走向和空间展布有较好的应用效果;在沉积盆地地区,EH-4受整体电阻率和地表电阻率的影响,其勘查深度少则二三百米,多则五六百米,变化较大,虽然勘查深度不大,但其对浅部地电性质的反映效果较好。

EH-4 has been applied to many fields, such as mineral exploration and engineering exploration. Nevertheless, because of the limitation of the acquisition frequency as well as geological and geophysical conditions, the application effects of EH-4 in different geological backgrounds are different. In order to prove the argument that the geological geophysical work in EH-4 is reasonable, the authors analyzed the EH-4 effects in exploration of Lianshangguan hard rock type uranium, sandstone type uranium deposit in Erlian Basin and mined out region of Yili basin in Xinjiang. The results show that, in the hard rock area, the depth of EH-4 exploration generally can reach 1000 m or so, and the detection of faults, the contact zone of rock bodies and its strike and spatial distribution can yield fairly good application effect;in sedimentary basins, the exploration effect of EH-4 is affected by the overall depth of resistivity and surface resistivity, the exploration depth may sometimes only reach two hundred or three hundred meters, but can sometimes reach five hundred or six hundred meters. Although the depth of exploration is not big, but the shallow geoelectric properties reflect good effect.