Application of airborne transient electromagnetic method in the delineation of aquifer stratum in Balinzuoqi, Inner Mongolia
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摘要:
巴林左旗是内蒙古赤峰的典型缺水区域，水资源的匮乏制约了地区的农牧业发展，圈定含水地层对本区具有重要意义。为了实现地下水增储，使用直升机瞬变电磁法，勘探本区地下水资源。在工作中对航空瞬变电磁数据进行视电阻率-深度计算，dB/dT感应电动势分析，衰减曲线特征分类，最终圈定本区含水地质体，给出了含水地层平面及空间展布特征。推断本地区地下含水层顶面主要埋深在10~30 m，含水层厚度30~80 m，全区共有地下水储量约4.54×106 t。航空瞬变电磁法在本地区找水方面取得了较好的效果，在水文地质勘查方面具有很大前景。
Abstract:Balinzuoqi is a typical water-deficient area in Chifeng, Inner Mongolia, where the scarcity of water resources restricts the development of regional agriculture and animal husbandry.Identifying aquifer stratum is of great significance to this area.In order to increase the storage of groundwater, the helicopter airborne transient electromagnetic method was used in May 2019 to explore groundwater resources in this area.In the work, the resistivity conversion of the airborne transient electromagnetic data, analysis of the dB/dT induced electromotive force and classification of the attenuation curve were performed to finally delineate the water-bearing geological body in the area, which resulted in the plane and spatial distribution characteristics of the water-bearing formation.It is inferred that the top surface of the underground aquifer in this area is mainly buried at the depth of 10 m to 30 m, the thickness of the aquifer ranges from 30 m to 80 m, and the total underground water reserve in the whole area is about 4.54×106 tons.The airborne transient electromagnetic method has achieved agreeable results in water prospecting in this area and has great prospects in hydrogeological survey.
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表 1 巴林左旗地区岩(矿)石电阻率
Table 1. Resistivity for different lithology in Balinzuoqi area
岩石名称 电阻率最大值/(Ω·m) 电阻率最小值/(Ω·m) 电阻率均值/(Ω·m) 第四系坡积物 103 44 75 第四系洪积物 93 25 53 凝灰岩 1237 1799 1518 安山岩 1953 3431 2805 板岩 970 1711 1436 粉砂岩 443 1258 998 泥岩 216 963 503 变质粉砂岩 1589 4207 3374 辉绿岩 5558 7610 6825 花岗岩 2857 3962 3442 磁铁矿 1462 4845 2215 银多金属矿石 107 481 331 
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