扩展的倾斜角和倾斜角总水平导数方法  

Extended tilt angle and total horizontal derivatives

作　　者：王明[1] 郭志宏[1] 骆遥[1] 罗锋[1] 

机构地区：[1]中国国土资源航空物探遥感中心,北京100083

出　　处：《地球物理学进展》2013年第3期1453-1463,共11页Progress in Geophysics

摘　　要：为了突出显示重磁场中地质体分布、断裂构造特征等信息,使图像显示错落有序、层次分明、清楚直观,有利于解释人员从不同角度认识重磁场异常特征.本文通过分析倾斜角概念,根据反余切函数特性,提出了扩展的倾斜角(iTdr)和倾斜角总水平导数(iTdr_Thdr)方法,来增强重磁异常信息,突出异常形状特点,以便于识别重磁异常中地质体边界和提取地质体分布、断裂构造平面展布特征等信息.理论模型和实际资料对比分析表明该方法简单、实用、具有较好的识别效果和较高的分辨能力,能够获取丰富的地质信息,对识别地质体边界、划分大地构造单元、确定断裂带和地质构造走向等具有实际意义.Through the analysis of Tilt Angle concept, we propose the methods that extended Tilt Angle （iTdr） and extended Total Horizontal Derivatives （iTdr_Thdr） according to the characteristics of Inverse Cotangent Function, to detect the geological boundaries in potential field and extract geological body distribution, characteristics of fracture structure plane distribution and other geological intZormation. The way is designed to stand out the geological body distribution and fault structural features, to make the anomaly map scattered order, well arranged, clear and intuitive. The essence of methods are normalized vertical derivative transform processing with the characteristics of Inverse Cotangent Function. The numerical experiments show the methods are simple and effective. Application on the RTP aeromagnetic data indicate that the methods can effectively determine the gravity and magnetic source boundaries with higher resolution, also can obtain abundant geological information. The methods have certain significance to detect the geological boundaries, devise tectonic units, determine the fracture zone and the trend of geologic structure, and these will facilitate the integrated interpretation.

关 键 词：反正切函数 反余切函数 倾斜角 倾斜角总水平导数 边界识别 

分 类 号：P631[天文地球—地质矿产勘探]