重磁位场转换方法研究及应用

发布时间：2018-01-07 12:08

本文关键词：重磁位场转换方法研究及应用　出处：《成都理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：重磁位场转换处理在重磁勘探数据处理与解释中具有重要的地位,为了将复杂异常化为简单异常,以满足某些解释方法的需要;将实测异常分解及变换,从而可更方便的利用信息,为解释提供更多的手段,提高解释的效果;突出异常的有用信息,压制干扰,区分异常的性质,及提供产状等。位场转换处理的内容它包括空间换算,(向上、向下解析延拓、地形改正);不同分量之间的换算;不同磁化方向之间的换算(化到磁极);各阶导数换算,(局部异常和区域异常的划分、滤波等等)。向上延拓和向下延拓两个主要内容。位场转换即上、下延拓的实质就是利用在地表面观测到的位场值,用数学方法换算出空间某一高度或地面以下某一深度位置上的位场值。向上延拓压制浅部异常,突出深部区域异常;向下延拓压制深部异常,突出浅部局部异常。本文以位场转换的上、下延拓换算为研究对象,分别介绍了四种方法(积分插值法、数值积分法、直接解拉普拉斯方程和等效源法)的理论基础与方法技术,并通过建立模型,综合对比分析各种方法的优劣。本文设计了两组模型,模型一为五个体积较大埋深较深的正方体,四个小而浅的长方体和模型二为五大两小的7个球体,本文运用所研究的四种方法分别对所设计的模型,进行上延拓和下延拓计算处理。通过其成果分析,得出了在进行上、下延拓时,等效源效果最好,直接解拉普拉斯方程和数值积分法效果次之,积分插值法效果最差。在实际应用方面,本文以某地区数据资料为例进行位场转换处理,用积分插值法,数值积分法,直解拉普拉斯方程,等效源法对该重力测量数据进行上延拓处理,然后将四种方法的延拓效果进行对比与分析,推断解释与地质资料解释相吻合,得出了与理论研究和模型试验同样的结论,收到了很好的应用效果。
[Abstract]:The conversion processing of gravity and magnetic potential field plays an important role in the processing and interpretation of gravity and magnetic exploration data. In order to transform complex anomalies into simple anomalies, it can meet the needs of some interpretation methods. By decomposing and transforming the measured anomalies, it is more convenient to use the information, to provide more means for interpretation and to improve the effect of interpretation. Highlighting useful information of anomalies, suppressing interference, distinguishing the nature of anomalies, and providing occurrence, etc. The contents of potential field conversion processing include spatial conversion (upward, downward analysis and continuation, topographic correction); Conversion between different components; Conversion between different magnetization directions (converted to magnetic poles); The conversion of each order derivative (division of local anomaly and regional anomaly, filtering, etc.). Upward continuation and downward continuation. The essence of the downward continuation is to use the potential field values observed on the surface of the earth to convert the potential field values at a certain height of space or at a certain depth below the ground surface by mathematical method and to suppress shallow anomalies by upward continuation. Outburst of deep regional anomalies; Downward continuation suppresses deep anomalies and highlights shallow local anomalies. In this paper, four methods (integral interpolation method and numerical integration method) are introduced. The theoretical basis and technique of direct solution of Laplace equation and equivalent source method, and through the establishment of models, comprehensive analysis of the advantages and disadvantages of various methods. Two groups of models are designed in this paper. Model one consists of five cubes with larger volume, four cuboids with small and shallow depth, and seven spheres with five cuboids and two small spheres. In this paper, four methods are used to analyze the designed models. Through the analysis of the results, it is concluded that the effect of the equivalent source is the best in the upper and lower continuation, the second is the direct solution of Laplace equation and numerical integration method. The effect of integral interpolation method is the worst. In practical application, this paper takes the data of a certain area as an example to deal with the potential field conversion, using the integral interpolation method, numerical integration method, direct solution of Laplace equation. The equivalent source method carries on the upward continuation processing to the gravity survey data, then carries on the contrast and the analysis to the continuation effect of the four methods, inferred the interpretation is consistent with the geological data interpretation. The conclusion is the same as the theoretical research and the model test, and the application effect is very good.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P631

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