【摘要】：實(shí)際的地面磁法勘探往往是在起伏觀測(cè)面上測(cè)量異常值,尤其是在我國(guó)西部山區(qū)。當(dāng)?shù)匦纹鸱^大或地下磁性體貼近地表分布時(shí),磁異常曲線形態(tài)往往會(huì)變得復(fù)雜甚至產(chǎn)生畸變,此時(shí)地形對(duì)磁異常的反演和解釋有很大的影響。因此,為了突出有用的異常信息,更準(zhǔn)確地解釋異常特征,一般有兩種處理方法,一是尋求直接在起伏地形上進(jìn)行解釋的方法,二是經(jīng)過(guò)地形改正(曲化平)后再作解釋。在此背景下,本文研究特征點(diǎn)法直接反演起伏地形條件下薄板的磁異常,以期對(duì)相關(guān)的生產(chǎn)實(shí)踐工作有一定的指導(dǎo)作用。起伏地形條件下無(wú)限延深薄板的直接解釋方法(即特征點(diǎn)法)是由成都理工大學(xué)郭紹雍(1980)提出的,最早用于起伏地形(單斜坡、山脊、山谷和任意山谷或山脊地形)上薄板異常曲線的反演。該方法利用起伏地形條件下薄板主剖面曲線上和的比值以及極值點(diǎn)間的距離,求出γ角、板上頂中心的埋深h和原點(diǎn)位置(上頂中心在地面的投影點(diǎn)),從而達(dá)到反演的目的。本文在前人研究的基礎(chǔ)上,將該方法擴(kuò)展到薄板?T磁異常中,發(fā)現(xiàn)同樣可利用起伏地形(單斜坡、山脊、山谷和任意山谷或山脊地形)上?T曲線中?T和?T的比值以及極值點(diǎn)間的距離,求出θ角、板上頂中心的埋深h和原點(diǎn)位置。文中還推導(dǎo)出復(fù)斜坡、任意復(fù)斜坡地形條件下特征點(diǎn)法直接反演薄板磁異常的公式,再總結(jié)已有的水平地形上反演薄板磁異常的特征點(diǎn)法,即可得到任意地形(六類地形)上特征點(diǎn)法直接反演薄板磁異常的公式,為該反演方法增加了新的內(nèi)容。通過(guò)六種地形(水平地形、單斜坡、復(fù)斜坡、山脊、山谷和任意起伏地形)條件下的模型驗(yàn)證和反演計(jì)算,證明了該方法的正確性和有效性;并對(duì)該方法的適用條件進(jìn)行了探討,分析后發(fā)現(xiàn)特征點(diǎn)法直接反演也對(duì)滿足一定條件的厚板狀體有效,地形的起伏程度也一定程度上影響著反演結(jié)果的精度。在實(shí)際資料處理時(shí),對(duì)四川某磁鐵礦區(qū)地面磁測(cè)?T和數(shù)據(jù)中的兩條分別與有限延深厚板和無(wú)限延深薄板相似的異常剖面進(jìn)行特征點(diǎn)法直接反演,其結(jié)果與應(yīng)用重磁2.5D人機(jī)交互反演的結(jié)果相近,說(shuō)明本文所述的方法對(duì)磁測(cè)資料的初步解釋推斷具有實(shí)用價(jià)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 緯 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.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P631.2

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