中心回线瞬变电磁测深时间域处理解释技术

A New Approach for Interpreting TEM Data in Time Domain

依据电磁场的弛豫过程,对野外实际观测的感应电动势时间曲线进行背景消除和微分变换,而后对变化后的结果进行深度标定,获得一种新的地电断面图,再对该种断面图进行解释,解决实际地质问题。在对某水库坝基岩石溶洞进行勘测中,利用该技术取得了十分良好的结果。钻孔验证解释结果时,成功找到了地下34m处直径2m的溶洞,与解释结果完全相符合。证明该研究成果可用于石油勘探中的浅层结构调查。

Based on the relaxation effect of electromagnetic field,a new approach was established for interpreting central loop TEM acquired data.By 3-dimensional modeling of the responses of center loop TEM,the characteristics of the responses of a buried target geological body at different depthes or with different electrical parameters was studied.The technique is used for surveying a cave of water reservoir,better effect is obtained,the result of hole drilling shows that a 2m diameter karst cave is discovered at 34m,,it is consistent with the result of interpretation.