定向扫描成像测井技术在利国铁矿的应用

Application on Directional Scan Imaging Well Logging Technique in LiGuo Iron Mine

埋藏在地下深处的铁矿资源,要借助于大量的钻孔勘探资料及相关地质资料进行对比、计算、分析,才能构绘出矿体的空间分布特征。运用陀螺定向的超声成像测井技术,能在磁屏蔽、磁干扰条件下按照规定的方向对井壁进行扫描,把井壁展开成一个连续的平面图像,根据图像上超声回波信号的强弱特征,就可以直观地判读出铁矿层的产状、厚度、完整性等矿体信息及围岩岩溶、裂隙发育情况等水文地质要素。因此,这种方法用来指导矿业勘探和开采,可以减少勘探工作量,降低勘探成本,提高工作效率,具有一定的推广价值。介绍了陀螺定向超声成像测试技术原理、野外工作方法与技术要求等,并通过了实验应用。

The space distribution characteristics of iron ore resource buried at depth can be figured out by comparing, calculating and analysing a large amount of drilling exploration data and relative geological data. By gyro-positioning ultrasonic imaging well logging technique, we can scan the well wall in a given direction even under magnetic shielding or magnetic interference. Then, a continuous plane graph can be gained. According to the strong and weak characteristics of ultrasonic echo signals in the graph, we can visually read orebody information about occurrence of iron ore bed （ spacial form of orebody）, thickness and integrity, and hydrological factors about the development status of surrounding rock karst and fractures. Its application in guiding mine exploration and exploitation can reduce exploration workload, decrease exploration cost and improve work efficiency, and therefore, it is of certain popularization value.