关于JCX-3型井磁仪器及其资料整理

THE JCX-3 TYPE BOREHOLE MAGNETIC INSTRUMENT AND ITS DATA-PROCESSING

经参加全国危机矿山示范项目的实际工作,认为目前重庆地质仪器厂生产的新型JCX-3井中三分量磁测仪探头倾斜面向北时X读数正值最大,倾斜面向南时X读数负值最大,X分量指向井斜方向。两者在直角坐标系中虽然同样符合左手法则,但新老仪器的井下磁测传感器x、y坐标相差90°。因而,对于当前广泛在用的数十台JCX-3型仪器的测量结果,如果仍然套用建立在垂向系统基础上的矢量计算公式,就会导致应用和解释错误,因此有必要共同探讨。

Based on experience obtained in the practical work of the demonstrative projects for Chinag critical mines, the authors have reached the following conclusions： For the new type JCX-3 borehole three-component magnetic survey instrument produced by the Chongqing Geological Instrument Factory, when the inclined plane of the probe is directed northward, the positive value of the X nu- merical reading is the maximum; when the inclined plane is directed southward, the negative value of the X numerical reading is the maximum, and the X component is directed towards the borehole inclination. Although both of the above two situations accord with the left handed rule in the system of rectangular coordinates, the x, y coordinates of the borehole magnetic survey sensor of the new instrument are different from things of the old instrument by 90°. It is therefore thought that, for the measurement results obtained by tens of JCX-3 type instruments which are extensively used at present, the utilization of the vector calculation formulae established on the basis of the vertical system might lead to the mistaken application and interpretation. And hence this problem deserves further consideration.