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Application of wavelet packet in gravity anomaly processing

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Global Geology 2012年第2期15卷 187-190页

作者： ZHANG Hong wu yangang College of Geo-Exploration Science and Technology Jilin University Changchun 130026 China

Based on the advantages of the wavelet to separate regional field and local anomalies in MATLAB environment,a high-precision regional-residual separation was finally realized. Analytical continuation and trend surface analysis are conventional methods for gravity anomaly separation. But the wavelet packet analysis in analyzing gravity data can make the gravity anomaly to be computed at a higher precision. In this paper,wavelet packet method is used to process gravity anomaly data obtained in Laos,and the separation result is good. Daubechies wavelet series has a higher precision in the wavelet packet.

关键词： wavelet packet analysis gravity data local anomalies analytical continuation

Comparative analysis of fracture identification methods based on gravity anomaly in Heilongjiang

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Global Geology 2015年第2期18卷 134-139页

作者： CHANG Chang YANG Changbao wu yangang CHEN Jingyi College of Geo-Exploration Science and Technology Jilin University College of Engineering and Natural Sciences University of Tulsa

The identification of fractures is of great importance in gravity and magnetic data processing and *** this study,four fracture identification methods are applied,and widely used in processing and analysis of the gravity anomaly,including vertical second derivative method,tilt derivative method,theta map method and normalized differential method,for gravity data acquired in a given area in *** comparing the distribution of the zero contour or maximum contour,we summarize the application effects,and both advantages and disadvantages of each *** is found that tilt derivative method and normalized differential method provide better effects than other two methods:the narrower anomaly gradient belt and higher identification precision of fracture or geological *** inferred fractures and geological boundaries have a great match with the results obtained from geologic map and remote sensing data *** study results have definitely provided the theoretical foundation for identifying faults and the geological boundaries.

关键词： gravity anomaly fracture identification Heilongjiang

Image Restoration of Depth of Field Extension Imaging System Based on Genetic Algorithm

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International Journal of Technology Management 2013年第2期 37-40页

作者： He Yun wu yangang Tian Jialin Xu Wen Jilin University Changchun Jilin130012 Aviation University of Air Force Changchun Jilinl 130022

Genetic algorithm is a search algorithm based on genetic mechanism and natural selection. It has been widely applied to research fields including image processing field. The paper improves standard genetic algorithm and improves the arithmetic speed of the algorithm, which achieves better image restoration effect. And the paper compares the image restoration quality of traditional algorithm, standard genetic algorithm and improved genetic algorithm to prove the feasibility of applying genetic algorithm to image restoration.

关键词： image restoration genetic algorithm image processing image degradation

Applications of gravity data in identification of faults and tectonic boundaries of a working area in Inner Mongolia

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Global Geology 2019年第2期22卷 133-140页

作者： ZOU Bolun LI Tonglin wu yangang wu Heyu SHI Jiaqiang LIN Baoze College of Geo-Exploration Science and Technology Jilin University

In order to determine the tectonic framework of the Late Paleozoic sedimentary basin of the studied area in Inner Mongolia, horizontal derivative, vertical derivative, total gradient modulus, tilt angle, and Euler deconvolution methods were used to process the high-precision gravity data. Four major faults and six secondary faults have been identified according to the horizontal fault position information provided by the first four methods, and the fault depth information were obtained using the Euler deconvolution method. The interpreted faults were identified as the main basin-controlling structures in the study area, which was helpful for deepening the understanding of the basin's structure, as well as providing important references for delineating hidden polymetallic ore veins.

关键词： gravity Euler deconvolution tectonic boundaries identification Inner Mongolia

Several boundary identification methods of gravity data and application in Vientiane of Laos area

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Global Geology 2014年第1期17卷 55-61页

作者： LI Lin wu yangang YANG Changbao HUAN Hengfei GUO Cancan College of Geo-exploration Science and Technology Jilin University Shenyang Center of China Geological Survey School of Geophysics and Information Technology China University of Geosciences

The authors studied the potential field boundary identification of the new technology in order to find out the possible fractures or contact zones using the following methods such as tilt derivative,horizontal derivative of tilt derivative,normalized standard deviation and normalized differential method. Combined with Euler deconvolution and small subdomain filtering,the actual data processing results show that these methods are all able to identify wider range extending fractures and obtain abundant geological information. The horizontal derivative of tilt derivative and normalized differential method have a better resolution for the small cutting fractures and lacunae in the studied area. They provide a reliable basis for study of the cutting relationship between fractures.

关键词： potential field boundary identification fracture detect Vientiane Laos

Application of several potential field separation methods of gravity data in Vientiane of Laos area

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Global Geology 2017年第2期20卷 89-97,105页

作者： LI Zhaohui ZHAO Qiang wu yangang YANG Changbao ZHAO Guoxing XING Congcong College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China 519 Team of North China Geological Exploration Bureau Baoding 071051HebeiChina

Gravity data observed in geophysical surveys are the sum of potential field produced by all underground inhomogeneous geological sources with different scales,different patterns and different depths. The aim of gravity exploration is mainly to extract the meaningful local anomaly from the regional gravity anomaly which is helpful to detect the deep structure and delineate the favorable area for mineral prospecting. In this paper,several anomaly separation methods are theoretically discussed,including trend analysis method,finite element method,interpolating cut method and analytic continuation method. And,these methods are applied to achieve the delineation of potash-mine deposit in Vientiane. Through experiments,analysis and comparison,the separating result of upward continuation is shown to be satisfactory,for that can separate the ore body anomaly from the background field more effectively. Further,with the combination of the geological information and gravity anomaly,it infers four rich potash zones in the study area of Vientiane which is significant for future geological work.

关键词： gravity anomaly anomaly separation potash mine Vientiane area

基于地质体空间位置优化约束的航空重力梯度数据三维物性反演

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地球物理学报 2019年第4期62卷 1515-1525页

作者：张楠吴燕冈周帅孙鹏飞吉林大学地球探测科学与技术学院长春130026 中色杰泰地球物理科技(北京)有限公司北京100012 河北工程大学地球科学与工程学院河北邯郸056038

重力数据的物性反演面临着严重的多解性问题,降低多解性的有效手段是加入约束条件.而边界识别、深度估计及成像方法可获取地质体的水平位置、深度范围等几何参数信息,本文将基于数据本身挖掘的地质体几何参数信息约束到物性反演中,以降... 详细信息

重力数据的物性反演面临着严重的多解性问题,降低多解性的有效手段是加入约束条件.而边界识别、深度估计及成像方法可获取地质体的水平位置、深度范围等几何参数信息,本文将基于数据本身挖掘的地质体几何参数信息约束到物性反演中,以降低反演的多解性.通过引入基于深度信息的深度加权函数及基于水平位置的水平梯度加权函数建立优化约束条件,有效地提高了反演结果的横向及纵向分辨率.重力梯度数据包含更多的地质体空间特征信息,将优化约束反演方法应用到全张量数据的反演中,模型试验表明本文方法反演结果与理论模型更加吻合.最后对美国路易斯安那州文顿盐丘实测航空重力梯度数据的应用表明,本文方法在其他地球物理、地质资料不足的情况下获得更可靠的反演结果.

关键词：物性反演空间位置重力全张量优化约束

位场垂向高阶导数的Tikhonov正则化迭代法

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吉林大学学报（地球科学版） 2018年第2期48卷 394-401页

作者：杜威许家姝吴燕冈郝梦成吉林大学地球探测科学与技术学院长春130026

在位场数据处理中,垂向导数具有重要的物理意义。其在一定程度上可以划分不同深度和大小异常源产生的叠加异常,且导数的阶次越高,这种分辨能力就越强,但通常认为高阶导数的换算是不稳定的。本文在Tikhonov正则化求位场垂向高阶导数的基... 详细信息

在位场数据处理中,垂向导数具有重要的物理意义。其在一定程度上可以划分不同深度和大小异常源产生的叠加异常,且导数的阶次越高,这种分辨能力就越强,但通常认为高阶导数的换算是不稳定的。本文在Tikhonov正则化求位场垂向高阶导数的基础上,结合迭代法进行逐次逼近,提出了位场高阶导数的Tikhonov正则化迭代法,并且得到Tikhonov正则化迭代法的递推公式。通过对该方法的滤波特性分析可以看出,该方法计算的位场垂向高阶导数具有一定的稳定性及保幅性。模型试验和实际数据的处理表明,该方法计算结果较常规FFT求导法有更高的稳定性和实用价值。

关键词： Tikhonov正则化迭代法位场垂向导数

“五五”规划要把依法治理工作摆到更加突出的位置

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中国司法 2005年第7期 74-75页

作者：吴艳刚内蒙古司法厅副厅长内蒙古呼和浩特 010055

今年是“五五”普法规划研究论证年,本着继承与创新相结合、坚持与发展相结合、需要与可能相结合的原则,就“五五”规划中把依法治理工作摆到更加突出的位置这个重要问题谈几点粗浅思考。一、在“五五”规划中突出依法治理的必要性与可能性

关键词：依法治理依法治国基本方略党委普法工作法治实践规划长远计划