归一化总梯度方法的计算新技术  

A NEW COMPUTING TECHNIQUE OF NORMALIZED TOTAL GRADIENT

作　　者：王宝仁[1] 王芳[1] 

机构地区：[1]中国地质大学

出　　处：《物探化探计算技术》1991年第2期139-147,共9页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：地质行业基金

摘　　要：本文在前人的基础上对归一化总梯度方法作了新的探索,提出了1)新的圆滑滤波因子,该因子具有了随下延深度的不同而自动改变其滤波特性的功能,模型试算和实际资料计算表明,新的圆滑滤波因子的引入,不仅使归一化总梯度法一次计算能获得最终结果,大大减少了原方法利用极大值准则,选择最佳谐波数N时,所需的计算工作量,而且还提高了该方法的垂向分辩能力。2)引用了归一化总梯度相位Φ(x、z),利用相位剖面图可更清晰地表明断层构造的分布,综合分析归一化总梯度的等值线图和相位图,不仅可以定性确定场源体的埋藏深度和水平分布范围,而且可以提高该方法解释的准确与可靠性。On the preceding researches into the method of Normalized Total Gradient (NTG), two new calculating techniques have been developed as follows: (1) A new filter factor. It can change the filtering performance automatically depending on the downward depth. Both model studies and field data calculation show that the introduction of the new filter factor can not only take one time of calculating to obtain the final results by the method of NTG, by which less time is consumed than that by using maximum value criterion to search for optimal harmonic wave number N, but can also improve the vertical resolution; (2) Making use of the NTG phase Φ(x, z). The phase profiles can show the distributions of faults more clearly. To synthesize the isograms and phase diagrams of the NTG can not only determine the variety of the buried depth and horizontal distributions of a field source qualitatively, but can also improve the accuracy and reliability of the method.

关 键 词：石油 天然气 勘探 归一化 总梯度 

分 类 号：P618.130.8[天文地球—矿床学]