重磁(梯度)张量数据边界识别方法研究
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摘要
边界识别是重力数据解释的常规任务之一,但地质体的边界不能很好地与重力原始异常数据对应,而与重磁异常水平导数极大值、垂直导数零值相对应,因此大多利用该性质完成重磁边界识别任务。研究发现,现有边界识别方法会出现虚假边界,针对现有边界识别方法进行总结,并针对多余边界问题进行改进,提出新的边界识别,通过模型试验和实际数据证明,该方法可有效地去除多余边界,且降低了噪声的干扰,为重磁数据边界识别方法提供新的思路。
The boundary identification is one of the regular tasks of gravity and magnetic data interpretation,but gravity and magnetic raw anomaly data does not well correspond to the boundary of geological body.The maximum value of the horizontal derivative of gravity and magnetic anomalies are corresponding to the zero value of vertical derivative,which is used mostly to complete the assignment of gravity and magnetic boundary identification.We find that false boundary is caused by using current boundary identification method.This article summarizes the current boundary identification method and corrects the problem of excessive boundaries to present new boundary identification method.This new method can effectively remove excessive boundaries and reduces the disturbance of noise,which provides a new thinking way for gravity and magnetic data boundary identification method.
The boundary identification is one of the regular tasks of gravity and magnetic data interpretation,but gravity and magnetic raw anomaly data does not well correspond to the boundary of geological body.The maximum value of the horizontal derivative of gravity and magnetic anomalies are corresponding to the zero value of vertical derivative,which is used mostly to complete the assignment of gravity and magnetic boundary identification.We find that false boundary is caused by using current boundary identification method.This article summarizes the current boundary identification method and corrects the problem of excessive boundaries to present new boundary identification method.This new method can effectively remove excessive boundaries and reduces the disturbance of noise,which provides a new thinking way for gravity and magnetic data boundary identification method.
引文
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[2]王万银,潘玉,邱之云.位场数据归一化总水平导数垂向导数边缘识别方法(英文)[J];Applied Geophysics,2009(03):226-233.WANG WY,PAN Y,QIU ZY.A new edge recognition technology based on the normalized vertical derivative of the total horizontal derivative for potential field data[J].Applied Geophysics,2009(3):226-233.(In Chinese)
[3]马国庆,杜晓娟,李丽丽.利用水平与垂直导数的相关系数进行位场数据的边界识别[J].吉林大学学报(地球科学版),2011,41(S1)345-348.MA G Q,DU X J,LI L L.Edge detection of potential filed data using correlation coefficients of horizontal and vertical derivatives[J].Journal of Jilin University(Earth Science Edition),2011,41(S1):345-348.(In Chinese)
[4]刘艳,李桐林,黄旭钊,等.航磁异常轴向特征提取算法研究及其应用[J].地球物理学进展,2002(1):141-144.LIU Y,LI TL,HUANG X Z,et al.An automatic method of detection of aeromagnetic axes and its application[J].Progress in Geophysics,2002(01):141-144.(In Chinese)
[5]柏冠军,吴汉宁,赵希刚,等.重力资料识别鄂尔多斯盆地线性构造方法研究[J].地球物理学进展,2007(05):1386-1392.BAI G J,WU H N,ZHAO X G,et al.Research on recognition of linear structures using gravity data in ordos basin[J].Progress in Geophysics,2007(05):1386-1392.(In Chinese)
[6]郭华,吴燕冈,高铁.重力斜导数方法在时间域中的理论模型与研究[J].吉林大学学报(地球科学版),2006(S2):9-14.GUO H,WU Y G,GAO T.The research of theories model in time area with the method of title derivative in gravity[J].Journal of Jilin University(Earth Science Edition),2006(S2):9-14.(In Chinese)
[7]MILLER H G,SINGH V.Potential field tilt—a new concept for location of potential field sources[J].Journal of Applied Geophysics,1994,32:213-217.
[8]VERDUZCO B.,FAIRHEAD,J.D.,Green,C.M.New insights into magnetic derivatives for structural mapping[J].The Leading Edge,2004,23(2):116-119.
[9]EVJEN H M.The place of the vertical gradient in gravitational interpretations[J].Geophysics,1936(1):127-136.
[10]CORDELL L.Gravimetric expression of graben faulting in Santa Fe Country and the Espanola Basin,New Mexico[J].New Mexico Geol.Soc.Guidebook,30th Field Conf,1979:59-64.
[11]COOPER G R J,Cowan D R.Enhancing potential field data using filters based on the local phase[J].Computers&Geosciences,2006,32:1585-1591.