航磁数据在鞍山—集安地区的应用研究

发布时间：2018-03-21 13:25

本文选题：航磁数据　切入点：鞍山-集安地区　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：在我国二十世纪时,使用地面磁法来勘探寻找磁铁矿的技术,就已发展得较为成形了,磁法在寻找露头铁矿中的应用更是早就开始。磁法勘探的观测精度从过去的10n T发展到现在的0.1n T甚至是0.01n T左右的精度。在本世纪初开始,航空磁测逐渐发展成为一种常规的磁法测量手段。主要原因在于航空磁测工作效率更高,并具有信息量多,能在一定程度上削弱地面的人文磁源干扰,弱磁化异常特征可靠性强等特点。鞍山-集安地区属于辽宁与吉林的中东部的区域,该区域有鞍山铁矿区、集安金属矿区分布。由于铁矿等金属矿可以产生相对较强的磁性特征,在鞍山-集安地区,高磁性地质体与周围岩体之间的正负磁性差异是能够开展地球物理工作的前提。由此可见,在鞍山-集安地区内,利用航磁资料来探查磁铁矿、划分构造单元、以及推断断裂位置,有较为良好的地球物理基础。本文利用鞍山-集安地区的航空磁测数据提取出磁异常,对这些异常进行各种处理,再根据收集的地质资料和比对其它的勘探结果来分离有效的磁异常和剔除由其他原因引起的无效异常,然后结合当地的地质情况对这些有效的磁异常做出综合地质解释。具体的工作与主要成果如下:(1)建立理论模型验证几种常规磁异常分离的方法,如向上延拓、趋势分析、插值切割等方法在磁异常分离中的应用效果及适用性。(2)建立理论模型验证几种边界识别的方法,如垂向导数、NSTD、斜导数等方法进行边界识别的应用范围及优劣势。(3)将上述方法应用于鞍山-集安地区的航磁资料处理中,通过向上延拓、插值切割、多尺度小波分析等方法进行磁异常场的分离;利用垂向二阶导数、解析信号、剩余磁异常等方法推断鞍山-集安地区的磁性地质体分布范围;利用斜导数、水平导数、?图法等方法的处理结果综合该地区的地质资料,确定该地区的断裂位置和走向。(4)根据上述处理结果推断出可能或已经存在的鞍山式铁矿的成矿远景区。
[Abstract]:In 20th century, the technology of using the surface magnetic method to explore and search for magnetite was developed in China. The application of magnetic method in finding outcrop iron ore has long begun. The observation accuracy of magnetic exploration has developed from 10nT in the past to 0.1nT or even 0.01nT at present. Aeromagnetic measurement has gradually developed into a conventional method of magnetic measurement. The main reason lies in the fact that aeromagnetic measurement is more efficient and has more information, which can weaken the interference of human magnetic source on the ground to a certain extent. The Anshan-Ji 'an area belongs to the central and eastern part of Liaoning and Jilin, which has Anshan iron ore area. Due to the relatively strong magnetic characteristics of iron ore and other metal ore deposits, in Anshan-Ji 'an area, The difference between the positive and negative magnetic properties between the high magnetic geological body and the surrounding rock mass is the prerequisite for the geophysical work. Thus, in Anshan-Ji 'an area, aeromagnetic data are used to explore magnetite ore and divide the tectonic units. In this paper, magnetic anomalies are extracted from aeromagnetic data of Anshan-Ji 'an area, and these anomalies are processed. On the basis of the geological data collected and the results of other exploration, effective magnetic anomalies are separated and invalid anomalies caused by other causes are eliminated. Then combined with the local geological conditions to make a comprehensive geological interpretation of these effective magnetic anomalies. The specific work and main results are as follows: 1) establish a theoretical model to verify several methods of separation of conventional magnetic anomalies, such as upward continuation, trend analysis, The application effect and applicability of interpolation cutting method in magnetic anomaly separation. (2) establishing a theoretical model to verify several methods of boundary recognition. For example, the vertical guide number NSTD, oblique derivative and other methods for boundary identification are applied to the aeromagnetic data processing in Anshan-Ji 'an area by means of upward continuation and interpolation. The magnetic anomaly field is separated by multi-scale wavelet analysis, the distribution range of magnetic geological body in Anshan-Ji 'an area is inferred by the methods of vertical second derivative, analytic signal and residual magnetic anomaly, and the oblique derivative and horizontal derivative are used to deduce the distribution range of magnetic geological body in Anshan-Ji 'an area. According to the processing results of map method and other methods, the geological data of this area are synthesised, and the fault location and strike in this area are determined. (4) based on the above processing results, the metallogenic prospect of Anshan type iron ore is inferred, which may or has already existed.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.222

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