| 王润生.胶东牟平-乳山成矿带金青顶金矿广域电磁法探测效果分析[J].地质与勘探,2022,58(1):129-137 |
| 胶东牟平-乳山成矿带金青顶金矿广域电磁法探测效果分析 |
| Effect analysis of wide field electromagnetic method for Jinqingding gold deposit in Muping-Rushan metallogenic belt, Jiaodong |
| 投稿时间：2020-09-21 修订日期：2021-07-10 |
| DOI： |
| 中文关键词: 广域电磁法 胶东 金青顶金矿 控矿断裂识别 电阻率异常 |
| 英文关键词: aerial transient electromagnetic method, altitude correction, Fourier series, exponential attenuation |
| 基金项目:国家自然科学基金-山东联合基金项目（编号：U2006201）、山东省级地质勘查项目（编号：鲁勘字（2019）32号）、山东省重大科技创新工程项目（编号：2018CXGC1601）和山东省地矿局地质勘查与科技创新项目（编号：KY202112）联合资助 |
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| 中文摘要: |
| 金青顶大型金矿床位于胶东东部牟平-乳山成矿带中段，是胶东地区硫化物石英脉型（金牛山式）金矿中的典型矿床。研究区内主要为断裂控矿，金矿体赋存于NNE向将军石断裂内，该控矿断裂发育在中生代玲珑花岗岩体内，倾向变化相对复杂，同时矿山开采带来了一定的工业干扰，电磁法勘探难度较大。本次在金青顶金矿区开展广域电磁法（WFEM）探测试验，在围岩物性单一及工业电磁干扰等因素下，主要研究该方法对于较小规模复杂形态金矿控矿断裂的识别能力，并与传统的可控源音频大地电磁测量（CSAMT）探测效果进行对比分析。结果表明，在钻孔控制的-1100 m以浅范围内，WFEM法与CSAMT法均可达到较为理想的探测效果，前者对于将军石断裂倾向变化的地电异常响应更加细致，一定程度体现出广域电磁法的高精度探测特点；在-1100 ～-2500 m区间，广域电磁法推断解译的深部断裂线性串珠状低阻异常特征依然明显，且对深部断裂内低阻矿化体具有较强的局部识别能力，体现了该方法同时具有大深度探测优势。本次试验分析表明，广域电磁法能够有效弥补常规电磁勘探方法在本区的局限性，并同时满足区内高精度及大深度的金矿勘查需求，可较为清晰地反映出将军石控矿断裂的垂向形态特征，为金青顶矿区内今后开展深部金矿勘查及研究工作提供较为充分的地球物理依据，同时表明广域电磁法是适用于胶东地区硫化物石英脉型金矿探测的有效电磁勘探方法之一。 |
| 英文摘要: |
| In recent years, China has carried out a series of production activities after introducing foreign airborne transient electromagnetic measurement systems. A set of airborne transient electromagnetic data processing specifications, however, have not been established, and the data processing technology of airborne electromagnetic measurement needs to be further improved. For instance, the airborne transient electromagnetic measurement data contain obvious interference anomalies in low resistance and low areas due to the existence of fluctuating flight, which requires flight altitude correction. This paper focuses on such a data processing method of altitude correction. Through the analysis of this method, it is concluded that the attenuation law of the transient field of the triangular-wave field source is similar to that of the electromagnetic field in the frequency domain, showing an approximate exponential attenuation. The height correction method based on this attenuation law can better eliminate the interference anomalies caused by the flight height fluctuation. It is suggested that the exponential attenuation law can be used for the height correction of the airborne transient electromagnetic method of the triangle-wave field source. |
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