摘要
重力数据的边界识别技术有助于确定地质体或地质构造的边界。近年来涌现出多种边界识别方法,但各种方法的应用条件与处理效果存在差异,为深入了解这些方法的优缺点,便于实际资料处理解释时方法选取具有针对性,需要对各方法效果进行对比总结。针对常用导数类边界识别方法存在异常幅度随地质体埋深增加而迅速衰减的情况,基于理论模型的合成重力数据,分别在只存在重力正异常、同时存在重力正负异常及在同时存在正负异常重力数据中添加有高斯噪声三种情况下,开展了基于Logistic函数及总水平导数的边界增强法(LTHG)与常用总水平梯度(THG)、解析信号(AS)、倾斜角法(TDR)、倾斜角的总水平导数法(THDR)、总水平梯度的倾斜角法(TTHG)、解析信号的倾斜角法(TAS)、Theta图法(TM)、归一化总水平导数垂向导数法(NVDR_THDR)九种边界识别方法的对比研究,分析各方法在对不同埋深场源体的均衡能力、分辨能力及抗噪能力等方面的适用性及应用效果。研究结果表明:LTHG法的识别结果不依赖于场的埋藏深度,可很好地识别出不同埋深的场源边界,与其他常用方法相比LTHG法可提供准确、清晰、分辨率更高的场源体边界信息,最后将该方法应用于埃塞俄比亚欧加登盆地中部的航空重力资料处理中,处理结果与研究区的断裂构造有较好的相关性,同时又显示了更多的地质现象,应用效果较好。LTHG法在埋深均衡、分辨力及抗噪性各方面表现有优势,可以在生产实际中推广。
The commonly used edge identification method of gradient has the shortcoming of the rapid attenuation of amplitude with buried depth.In this pater,a kind of method based on Logistic function and total horizontal derivative boundary was introduced.A comparative study was carried out between LTHG method and other boundary identification methods:THG,AS,TDR,THDR,TTHG,TAS,TM and NVDR_THDR under three conditions:only positive gravity anomalies,both positive and negative gravity anomalies,and Gaussian noise added to gravity data with both positive and negative gravity anomalies.The applicability and application effect of each method on the equalization ability,resolution ability and anti-noise ability of different buried depth field sources were analyzed.The results show that the identification result of LTHG method does not depend on the burial depth of the field,and it can well identify the boundary of the field source with different burial depths.Compared with other common methods,LTHG method can provide accurate,clear and higher resolution boundary information of field source,which is an effective method for qualitative interpretation of potential field data.Finally,this method was applied to the processing of aerial gravity data in the central Ogaden basin of Ethiopia,and the processing results showed good correlation with the fault structures in the study area.At the same time,more geological details were displayed,and the application effect was good.The LTHG method has advantages in depth equalization,resolution,and noise resistance,and can be promoted in practical production.
作者
彭莉红
张伟盟
程莎莎
孙栋华
骆燕
陈伟
PENG Lihong;ZHANG Weimeng;CHENG Shasha;SUN Donghua;LUO Yan;CHEN Wei(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China;CNNC Key Laboratory of Uranium Resources Geophysical Exploration Technology,Shijiazhuang 050002,China;Hebei Key laboratory of Airborne Survey and Remote Sensing Technology,Shijiazhuang 050002,ChinaAbstract)
出处
《世界核地质科学》
CAS
2024年第1期185-195,共11页
World Nuclear Geoscience
