| 位场解析信号振幅极值位置空间变化规律研究 |
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| 引用本文： | 王万银.位场解析信号振幅极值位置空间变化规律研究[J].地球物理学报,2012,55(4):1288-1299. |
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| 作者姓名： | 王万银 |
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| 作者单位： | 长安大学重磁方法技术研究所, 长安大学地质工程与测绘学院, 长安大学西部矿产资源与 地质工程教育部重点实验室, 西安 710054 |
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| 基金项目： | 国家科技重大专项,国土资源部全国油气资源战略选区项目,国土资源部《高精度航空物探调查》计划项目 |
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| 摘 要： | 通过对单一边界、双边界、多边界以及点(线)质量模型重力异常解析信号振幅和重力异常垂向导数解析信号振幅的极值位置空间变化规律研究表明,重力异常垂向导数解析信号振幅和化极磁力异常解析信号振幅的极值位置相同,且与重力异常解析信号振幅的极值位置空间变化规律相似.利用位场解析信号振幅极大值位置能够准确识别单一直立边界地质体的边缘位置,但不能准确识别其它任何形体的边缘位置,其识别结果的偏移量大小随地质体的埋深、水平尺寸以及倾斜程度等变化.虽然重力异常垂向导数解析信号振幅比重力异常解析信号振幅的峰值更加尖锐、横向识别能力更强,其极大值位置更靠近地质体上顶面边缘位置,但均受地质体埋深的影响较大;随着埋深的增加,位场解析信号振幅的极大值位置会快速收敛到形体的"中心位置",其轨迹类似"叉子状";且对多边界模型会出现"极大值位置盲区"而无法识别其边缘位置.通过这些理论研究表明,位场解析信号振幅只能识别单一边界地质体的边缘位置;而不宜用来识别多边界地质体的边缘位置,但可以用来识别多边界地质体的"中心位置".
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| 关 键 词： | 解析信号振幅 极值位置 空间变化规律 边缘位置 中心位置 极大值位置盲区 叉子状 |
| 收稿时间： | 2011-04-06 |
Spatial variation law of the extreme value position of analytical signal amplitude for potential field data |
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| WANG Wan-Yin.Spatial variation law of the extreme value position of analytical signal amplitude for potential field data[J].Chinese Journal of Geophysics,2012,55(4):1288-1299. |
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| Authors: | WANG Wan-Yin |
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| Institution: | Institute of Gravity and Magnetic Technology, Chang'an University, College of Geology Engineering and Geomatics, Chang'an University, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, China |
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| Abstract: | In this paper,the extreme value position and their spatial variation rules of analytic signal amplitude of gravity anomaly and gravity anomaly vertical derivative were analyzed by the means of single-border,double-border,multi-borders and point(or line) quality models.The research results indicated that the analytic signal amplitude of gravity anomaly vertical derivative have the same extreme value position as that of the RTP magnetic anamoly,and have the similar spatial variation rules as that of gravity anomaly.We can accurately recognize edge location of the single-border vertical body by the means of the maximum value position,but can not accurately recognize to any other geological bodies,and the offset varies with the buried depth,horizontal dimension and the degree of inclination of the geological bodies.Although the analytic signal amplitude of gravity anomaly vertical derivative has even more incisive peak than that of gravity anomaly,has more powerful crosswise recognition capability,and the extreme value position is nearer to the top edge of the geological body,but both influenced by the buried depth of the geological body;With increasing of the buried depth,the extreme value position of the potential field analytic signal amplitude converges fast to the central location of the geological body,and the orbit is similar to fork shape;And for the multi-border model,we can not recognize edge location of the body because of the blind spot of the maximum location of analytic signal amplitude.The above theories researches show that the analytic signal amplitude of potential field is suitable for recognize the edges location of the single-border geological body only,and should not be used to recognize the edge location of the multi-borders geological body,but can be used to recognize the central location of the multi-borders geological body. |
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| Keywords: | Analytic signal amplitude Extreme value position Spatial variation rule Edge location Central place Blind spot of the maximum location Fork shape |
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