特征点直接反演起伏地形上薄板磁异常及其应用
发布时间：2018-10-29 15:03
【摘要】：实际的地面磁法勘探往往是在起伏观测面上测量异常值,尤其是在我国西部山区。当地形起伏较大或地下磁性体贴近地表分布时,磁异常曲线形态往往会变得复杂甚至产生畸变,此时地形对磁异常的反演和解释有很大的影响。因此,为了突出有用的异常信息,更准确地解释异常特征,一般有两种处理方法,一是寻求直接在起伏地形上进行解释的方法,二是经过地形改正(曲化平)后再作解释。在此背景下,本文研究特征点法直接反演起伏地形条件下薄板的磁异常,以期对相关的生产实践工作有一定的指导作用。起伏地形条件下无限延深薄板的直接解释方法(即特征点法)是由成都理工大学郭绍雍(1980)提出的,最早用于起伏地形(单斜坡、山脊、山谷和任意山谷或山脊地形)上薄板异常曲线的反演。该方法利用起伏地形条件下薄板主剖面曲线上和的比值以及极值点间的距离,求出γ角、板上顶中心的埋深h和原点位置(上顶中心在地面的投影点),从而达到反演的目的。本文在前人研究的基础上,将该方法扩展到薄板?T磁异常中,发现同样可利用起伏地形(单斜坡、山脊、山谷和任意山谷或山脊地形)上?T曲线中?T和?T的比值以及极值点间的距离,求出θ角、板上顶中心的埋深h和原点位置。文中还推导出复斜坡、任意复斜坡地形条件下特征点法直接反演薄板磁异常的公式,再总结已有的水平地形上反演薄板磁异常的特征点法,即可得到任意地形(六类地形)上特征点法直接反演薄板磁异常的公式,为该反演方法增加了新的内容。通过六种地形(水平地形、单斜坡、复斜坡、山脊、山谷和任意起伏地形)条件下的模型验证和反演计算,证明了该方法的正确性和有效性;并对该方法的适用条件进行了探讨,分析后发现特征点法直接反演也对满足一定条件的厚板状体有效,地形的起伏程度也一定程度上影响着反演结果的精度。在实际资料处理时,对四川某磁铁矿区地面磁测?T和数据中的两条分别与有限延深厚板和无限延深薄板相似的异常剖面进行特征点法直接反演,其结果与应用重磁2.5D人机交互反演的结果相近,说明本文所述的方法对磁测资料的初步解释推断具有实用价值。
[Abstract]:The actual surface magnetic exploration is usually used to measure the abnormal values on the undulating observation surface, especially in the mountainous area of western China. When the topography is large or the underground magnetic body is close to the surface, the shape of the magnetic anomaly curve is often complicated and even distorted, and the topography has a great influence on the inversion and interpretation of the magnetic anomaly. Therefore, in order to highlight useful abnormal information and interpret anomaly characteristics more accurately, there are generally two processing methods, one is to seek for direct interpretation on the undulating terrain, the other is to make interpretation after terrain correction (leveling). In this context, the characteristic point method is studied to directly inverse the magnetic anomalies of thin plates under undulating terrain conditions, in order to guide the relevant production practice. The direct interpretation method of infinite extended thin plate under undulating terrain (characteristic point method) was put forward by Guo Shaoyong (1980) of Chengdu University of Science and Technology. It was first used in undulating terrain (single slope, ridge). Inversion of anomalous curves of thin plates on valleys and arbitrary valleys or ridges. By using the ratio of sum on the main section curve and the distance between extreme points in the main section of thin plate under undulating topography, the 纬 angle, the burying depth h of the top center of the plate and the position of the origin point (the projection point of the top center on the ground) are calculated, and the purpose of inversion is achieved. On the basis of previous studies, this paper extends this method to thin plate T magnetic anomaly, and finds that the undulating terrain (single slope, ridge, ridge) can also be used. The ratio of T to T in the T curve and the distance between extreme points are obtained. The 胃 angle, the burying depth h and the origin of the center of the top of the plate are obtained. The formulas for direct inversion of thin plate magnetic anomalies under the condition of complex slope and arbitrary complex slope are derived, and the characteristic point method for inversion of thin plate magnetic anomaly on horizontal terrain is summarized. The formula for direct inversion of magnetic anomalies of thin plates on arbitrary terrain (six types of terrain) by the method of characteristic points can be obtained, which adds new contents to the inversion method. The validity and validity of the method are proved by model verification and inversion calculation under six topographic conditions (horizontal terrain, single slope, complex slope, ridge, valley and arbitrary undulating terrain). The application conditions of this method are discussed. It is found that the direct inversion of the feature point method is also effective for the thick plate body which satisfies certain conditions, and the degree of relief of the terrain also affects the accuracy of the inversion results to some extent. In the actual data processing, the characteristic point method is used to directly invert the anomalous profiles of the ground magnetic survey T and the two data in a magnetite mine area in Sichuan, which are similar to the finite extended deep plate and the infinite deep thin plate, respectively. The results are close to those obtained by using gravity and magnetic 2.5D interactive inversion, which shows that the method described in this paper is of practical value for the preliminary interpretation and inference of magnetic data.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.2
本文编号：2298027
[Abstract]:The actual surface magnetic exploration is usually used to measure the abnormal values on the undulating observation surface, especially in the mountainous area of western China. When the topography is large or the underground magnetic body is close to the surface, the shape of the magnetic anomaly curve is often complicated and even distorted, and the topography has a great influence on the inversion and interpretation of the magnetic anomaly. Therefore, in order to highlight useful abnormal information and interpret anomaly characteristics more accurately, there are generally two processing methods, one is to seek for direct interpretation on the undulating terrain, the other is to make interpretation after terrain correction (leveling). In this context, the characteristic point method is studied to directly inverse the magnetic anomalies of thin plates under undulating terrain conditions, in order to guide the relevant production practice. The direct interpretation method of infinite extended thin plate under undulating terrain (characteristic point method) was put forward by Guo Shaoyong (1980) of Chengdu University of Science and Technology. It was first used in undulating terrain (single slope, ridge). Inversion of anomalous curves of thin plates on valleys and arbitrary valleys or ridges. By using the ratio of sum on the main section curve and the distance between extreme points in the main section of thin plate under undulating topography, the 纬 angle, the burying depth h of the top center of the plate and the position of the origin point (the projection point of the top center on the ground) are calculated, and the purpose of inversion is achieved. On the basis of previous studies, this paper extends this method to thin plate T magnetic anomaly, and finds that the undulating terrain (single slope, ridge, ridge) can also be used. The ratio of T to T in the T curve and the distance between extreme points are obtained. The 胃 angle, the burying depth h and the origin of the center of the top of the plate are obtained. The formulas for direct inversion of thin plate magnetic anomalies under the condition of complex slope and arbitrary complex slope are derived, and the characteristic point method for inversion of thin plate magnetic anomaly on horizontal terrain is summarized. The formula for direct inversion of magnetic anomalies of thin plates on arbitrary terrain (six types of terrain) by the method of characteristic points can be obtained, which adds new contents to the inversion method. The validity and validity of the method are proved by model verification and inversion calculation under six topographic conditions (horizontal terrain, single slope, complex slope, ridge, valley and arbitrary undulating terrain). The application conditions of this method are discussed. It is found that the direct inversion of the feature point method is also effective for the thick plate body which satisfies certain conditions, and the degree of relief of the terrain also affects the accuracy of the inversion results to some extent. In the actual data processing, the characteristic point method is used to directly invert the anomalous profiles of the ground magnetic survey T and the two data in a magnetite mine area in Sichuan, which are similar to the finite extended deep plate and the infinite deep thin plate, respectively. The results are close to those obtained by using gravity and magnetic 2.5D interactive inversion, which shows that the method described in this paper is of practical value for the preliminary interpretation and inference of magnetic data.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.2
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