Estimation of Depth to Salt Domes from Normalized Full Gradient of Gravity Anomaly and Examples from

• 作 者: Hamid Aghajani Ali Moradzadeh 曾华霖
• 机 构: Faculty of Mining,Petroleum and Geophysics,Shahrood University of Technology,School of Geophysics an
• 出 处: Journal of Earth Science
• 发表日期: 2009年06期
• 关键词: gravity normalized anomalous anomaly continuation locate depths domes buried int

We present an estimation of depth of anomalous bodies using normalized full gradient (NFG) of gravity anomaly. Maxima in the NFG map can locate the bodies and indicate their depth. Model calculation using a sphere and application of the NFG method to gravity anomalies over salt domes in the USA and Denmark shows effectiveness of the method. However, the accuracy of depth estimation strongly depends on the number of term N in the Fourier series used to calculate the NFG. An optimum N for the calculation can be given from a test.

We present an estimation of depth of anomalous bodies using normalized full gradient (NFG) of gravity anomaly. Maxima in the NFG map can locate the bodies and indicate their depth. Model calculation using a sphere and application of the NFG method to gravity anomalies over salt domes in the USA and Denmark show effectiveness of the method. However, the accuracy of depth estimation strongly depends on the number of term N in the Fourier series used to calculate the NFG. An optimum N for the calculation can be given from a test.