超高密度电阻率法与音频大地电磁测深法对贵州普安某萤石矿区断层的探测效果

陈德靖; 罗来冰; 吕天江; 杨海龙; 曹卫刚; 戴玉皇

陈德靖,罗来冰,吕天江,杨海龙,曹卫刚,戴玉皇.超高密度电阻率法与音频大地电磁测深法对贵州普安某萤石矿区断层的探测效果[J].贵州地质,2024,(1):33-41

超高密度电阻率法与音频大地电磁测深法对贵州普安某萤石矿区断层的探测效果

The Detection Effect of Ultra-high Density Resistivity Method and Audio Magnetotelluric Sounding Method for a Fluorite Mining Area in Pu’an，Guizhou Province

投稿时间：2023-09-22

DOI：

中文关键词: 超高密度电阻率法音频大地电磁测深法萤石矿断层电性结构

英文关键词:Ultra-high density resistivity method Audio magnetotelluric sounding Fluorite ore Fault Electrical structure

基金项目:贵州省省级地质勘查专项资金项目，贵州省普安县莲花山地区萤石矿调查评价。

作者	单位
陈德靖	贵州省地矿局地球物理地球化学勘查院，贵州贵阳550018
罗来冰	贵州省地矿局地球物理地球化学勘查院，贵州贵阳550018
吕天江	贵州省地矿局地球物理地球化学勘查院，贵州贵阳550018
杨海龙	贵州省地矿局地球物理地球化学勘查院，贵州贵阳550018
曹卫刚	贵州省地矿局地球物理地球化学勘查院，贵州贵阳550018
戴玉皇	贵州省地矿局地球物理地球化学勘查院，贵州贵阳550018

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中文摘要:

本文以贵州省普安县莲花山某调查区萤石成矿断层为研究重点，采用超高密度电阻率法和音频大地电磁测深法对同一断层进行了测量，查明了断层的平面分布情况和深部延伸情况，揭露出剖面峨眉山玄武岩组至茅口组“低阻-中阻-高阻”的三元分层电性结构。以峨眉山玄武岩组与茅口组接触带(蚀变体)的中阻特征为识别标志，结合断层延伸情况，推断出萤石矿体埋深范围，得到了钻孔验证。两种方法均对断层探测有较好的效果，也存在优劣势，超高密度电阻率法探测深度浅，测量精度高，但容易出现多种非目标体异常；音频大地电磁测深法探测深度深，但浅部分辨率较差，测量精度较低。实际工作中，应根据勘探目标的埋深情况选择合适的工作方法或综合两种方法，以达到更加可靠的物探解译成果。

英文摘要:

In this paper，the fluorite metallogenic fault in a survey area of Lianhuashan，Pu’an County，Guizhou Province，is studied by using ultra-high density resistivity method and audio magnetotelluric sounding method to measure the same faultThe plane distribution and deep extension of the fault are found out，and the three-layer electrical structure of “low resistance - medium resistance - high resistance” from Emeishan basalt formation to Maokou Formation is revealedBased on the medium resistance characteristics of the contact zone of Emei Mountain basalt formation and Maokou Formation，combined with the fault extension，the buried depth range of fluorite ore body is inferred and verified by drillingThe two methods have good effect on the fault detection，but also have advantages and disadvantagesThe ultra-high density resistivity method has shallow detection depth and high measurement accuracy，but it is prone to a variety of non-target anomaliesThe audio magnetotelluric sounding method detects deep depth，but the resolution of shallow part is poor，and the measurement accuracy is lowIn practice，we should choose the appropriate working method or combine the two methods according to the buried depth of the exploration target in order to achieve more reliable geophysical interpretation results

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