三分量大定源瞬变电磁勘探在新疆十红滩地区的应用

The application of the fixed loop TEM method to Shihongtan area,Xinjiang

十红滩地区位于新疆吐鲁番地区托克逊县西南缘,为了能够达到清晰识别区内地层和构造的目的,在该区利用三分量框内加框外大定源地面瞬变电磁测量方法。相对于动源装置,大定源装置提高测量效率是明显的。本次测量利用500 m边长线框测量3 km测线,通过三个分量测量数据的正反演建模,得到三分量建模结果。与传统的视电阻率剖面的成图结果进行比较,三分量建模结果所展现的地层结构和断裂构造更清晰,对进一步的解释以及地质建模工作具有重要意义。

Shihongtan area is located at the southwest edge of Toksun, Turpan, Xinjiang. In order to clearly divide strata and identify structures, the authors conducted 3?component fixed loop survey in this area. Fixed loop configuration can obviously raise work efficien?cy compared with moving loop configuration. The authors managed to measure 3 km survey line by settling a 500 by 500 meter transmit?ter loop. By modeling such 3?component data, the result could achieve better solution in both dividing strata and identifying structures than apparent?resistivity profile. The results achieved by the authors are also meaningful to the explanation and geological modeling.