区域重力异常多尺度密度反演研究  

STUDY ON MULTI-SCALE DENSITY INVERSION OF GRAVITY ANOMALIES

作　　者：侯遵泽[1] 杨文采[2] 

机构地区：[1]中国人民武装警察部队学院,河北廊坊065000 [2]中国地质科学院地质研究所,北京100037

出　　处：《物探化探计算技术》2013年第2期123-127,共5页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国土资源部地质调查计划项目资助（SinoProbe-01-05）

摘　　要：重力测量观测得到的重力异常，反映的是不同深度和不同尺度异常源的叠加效应。在理论上，只有进行适当的异常分解，才能较为准确地反演异常体的物性与几何参数。这里首先对重力异常进行小波多尺度分解，再通过频谱分析求出各层对应的中心深度，然后确定各层的平均密度，用广义线性反演方法反演各层密度的扰动，进而得到各层的密度分布。通过塔里木盆地的重力异常的多尺度分析和密度反演应用实例，显示了多尺度反演方法对区域重力异常的有效性和应用价值。The gravity anomalies observed on the ground come from the superposition of potential field of source bodies with different depth and different scale. And if the potential field is not properly decomposed, it is difficult to quantify the physical properties and geometric parameters of the source bodies through inversion computations. The paper introduced the method of wavelet multi-decomposed gravity anomalies first. After completing the multi-scale decomposition of gravity anomalies by discrete wavelet transformation, using the wavelet details anomalies to calculate the average power spectrum of them produce the central depths of the layers. After obtaining the density distribution by generalized linear den- sity inversion, we should suppose the average density of each stratum. Finally, we can inverse the relative density perturbation for each equivalent stratum. Results indicate that the method is valuable to exploration by wavelet transform analysis scheme and a density inversion in tarim basin.

关 键 词：区域重力异常 小波分析 多尺度分解 密度反演 

分 类 号：P631.1[天文地球—地质矿产勘探]