磁法勘查磁铁矿的应用研究

发布时间：2018-07-07 08:12

本文选题：化极 + 导数换算　；参考：《成都理工大学》2015年硕士论文

【摘要】：磁法勘探是利用地壳内探测物体被地磁场磁化后所产生的磁异常来进行勘探地下的地质体以及地质构造的一种地球物理方法。它是一种古老的物探方法,早在17世纪,就有人通过罗盘来寻找磁铁矿。由于磁法勘探具有装置轻便、工作效率高、速度快、成本低的特点,所以得到了广泛应用。本文通过磁法勘探测定研究区域的磁异常,并且采用多种数据处理方式,压制干扰,提高所测数据的信噪比,以突出磁异常反映地质构造及矿床特征的信息,提高磁异常解释推断的可靠性。对研究区进行1:5000的地面磁测,并对实测磁异常进行相应的处理和换算包括:ΔT的垂向导数换算与化极处理、以及不同深度的ΔT的向上延拓和向下延拓和磁异常的2.5D人机交互式反演;以此为依据对异常区做剖面推断以及半定量解释。以研究区域的磁异常特征为主要依据,结合搜集到的相关物探、地质资料等对研究区域的地质构造进行了推断和划分,对研究区域的磁铁矿分布进行推断,确定磁铁矿的位置和产状。推断认为:磁铁矿(化)带大多数分布在测区东北部,有3条呈北东走向的隐伏矿(化)带,其中的磁铁矿(化)体、分布范围较大、埋藏较深。研究结果表明,所采用的半定量解释方法在确定磁铁矿(化)带以及推断隐伏断裂带方面是能够提供有用的地球物理信息的。磁法勘探ΔT异常特征反映了区内不同地质构造的特点,对磁法数据选择优良的精测剖面做推断以及合适的半定量解释,能更好的推断出磁性矿体的产状、埋深、走向等。
[Abstract]:Magnetic exploration is a geophysical method to explore underground geological bodies and geological structures by using the magnetic anomalies caused by the magnetization of objects in the earth's crust. It is an ancient geophysical method, as early as the 17 th century, through the compass to look for magnetite. Magnetic exploration is widely used because of its portable device, high efficiency, high speed and low cost. In this paper, the magnetic anomalies in the studied area are determined by magnetic exploration, and various data processing methods are adopted to suppress interference and improve the signal-to-noise ratio of the measured data, so as to highlight the information of the magnetic anomalies reflecting the geological structure and the characteristics of the deposits. Improve the reliability of magnetic anomaly interpretation and inference. The surface magnetic measurements of 1: 5000 are carried out in the study area, and the corresponding processing and conversion of the measured magnetic anomalies include: conversion of the vertical guide number of 螖 T and processing of the polarity. And the upward continuation and downward continuation of 螖 T with different depths and 2.5D interactive inversion of magnetic anomalies, based on which the section inference and semi-quantitative interpretation of the anomalous region are made. Based on the characteristics of magnetic anomalies in the study area, combined with the relevant geophysical exploration and geological data collected, the geological structure of the study area was inferred and the distribution of magnetite in the study area was inferred. Determine the location and occurrence of magnetite. It is inferred that most of the magnetite belts are located in the northeast of the survey area, and there are 3 concealed ore (mineralization) zones with a north-east strike, in which the magnetite bodies are distributed in a large range and buried in a deeper depth. The results show that the semi-quantitative interpretation method can provide useful geophysical information in determining magnetite zones and inferring concealed fault zones. The characteristics of 螖 T anomaly in magnetic exploration reflect the characteristics of different geological structures in the area. It is better to infer the fine profile of magnetic method data and to make appropriate semi-quantitative interpretation to infer the occurrence, buried depth and strike of magnetic orebody.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.2

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