磁-电磁联合解译技术在张家湾铁矿床的应用

Application of Magnetic-electromagnetic Joint Interpretation Technology in Zhangjiawan Iron Deposit

在张家湾铁矿床上采用可控源音频大地电磁测深推测矿体产状特征,建立矿体分布模型,用以解决深部找矿问题。首先根据岩矿石磁性参数计算模型有效磁化强度和磁倾角,对模型进行正演模拟计算,验证模型可靠性;结果正演曲线与实测曲线拟合较好,证明了可控源推测矿体模型是比较可靠的。通过磁-电磁联合解译,解决了单一磁法手段解译深部铁矿误差大,尤其在地质条件相对复杂地区对深部矿体反映不够灵敏和多解性等问题,极大提高了矿体解译的准确性,取得了较好的深部矿体解译效果。

In Zhangjiawan iron deposit,controlled source audio-frequency magnetotelluric sounding was used to infer the occurrence characteristics of ore bodies,and the distribution model of ore bodies was established to solve the problem of deep prospecting.Firstly,according to the magnetic parameters of rock and ore,the effective magnetization intensity and magnetic inclination angle of the model are calculated,and the forward simulation of the model is carried out to verify the reliability of the model.The results show that the forward curve fits well with the measured curve,which proves that the controllable source ore body model is reliable.Through magnetic-electromagnetic joint interpretation,the problem of large error of deep iron ore interpretation by single magnetic method is solved,especially in areas with relatively complex geo logical conditions,which is not sensitive enough to reflect deep ore bodies and has multiple solutions.The accuracy of ore body interpretation is greatly improved,and better deep ore body interpretation results are obtained.