scholarly journals New Perspective in Regional and Residual Separation of Gravity and Magnetic Data Processing

2021 ◽  
Vol 1 (1) ◽  
pp. 204-210
Author(s):  
Wiji Raharjo ◽  
Indiati Retno Palupi ◽  
Oktavia Dewi Alfiani
Keyword(s):  
Data Processing ◽  
Original Data ◽  
Magnetic Data ◽  
Geological Interpretation ◽  
Interactive Tools ◽  
Gravity And Magnetic ◽  
Anomaly Map ◽  
New Perspective ◽  
Gravity And Magnetic Data ◽  
2D Fft

Separation between Regional and Residual anomaly in Gravity and Magnetic data processing is very important to get the best result in geological interpretation. Several method were used to solve this problem like upward continuation and polynomial fitting. With the same principle, 2D FFT is applied by make an interactive tools based on Matlab Language Programming, named “Oasis Ala-Ala”. It adopt the algorithm from software Oasis. It started with make visualization map or the original data, then the map divide into some grids. Each of grid contain gravity or magnetic data. Then it transformed from special to wavenumber domain. After that, it convolve with our own filter matrix. And the last step is inverse it to get the regional and residual anomaly map. However, Matlab is powerful in facilitate this process in the GUI Toolbox. One important thing is the size of gravity and magnetic data. It will improve to Filter matrix size before do inverse process.

A geological interpretation of gravity and magnetic data, northwest Saskatchewan

1970 ◽  
Vol 7 (3) ◽  
pp. 858-868 ◽  
Author(s):  
R. H. Wallis
Keyword(s):  
Gravity Data ◽  
Magnetic Data ◽  
Early Proterozoic ◽  
Geological Interpretation ◽  
Metasedimentary Rocks ◽  
Lower Proterozoic ◽  
Gravity And Magnetic ◽  
Northern Saskatchewan ◽  
Gravity And Magnetic Data ◽  
Sedimentary Unit

The striking 'fit' of aeromagnetic and gravity data from the Precambrian of northwest Saskatchewan, combined with known and nearby analogous, geological relationships, suggests the presence of a northeast-trending belt, 250 × 20 miles (400 × 30 km), of early Proterozoic (?) metasedimentary rocks, probably magnetite-bearing meta-arkoses. This structural–sedimentary unit might have economic possibilities analogous to other northeast-striking, Precambrian, lower Proterozoic (?), metasedimentary belts of northern Saskatchewan, the Virgin River Belt, and the Wollaston Trend.

Gravity and magnetic data processing further constrained inversion for 3D modelling and tonnage calculation

2020 ◽  
Vol 129 (3) ◽  
pp. 133-146 ◽  
Author(s):  
Saâd Soulaimani ◽  
Saïd Chakiri ◽  
Ahmed Manar ◽  
Ayoub Soulaimani ◽  
Abdelhalim Miftah ◽  
...  
Keyword(s):  
Data Processing ◽  
3D Modelling ◽  
Magnetic Data ◽  
Gravity And Magnetic ◽  
Gravity And Magnetic Data

Review of gravity and magnetic data processing systems

1972 ◽  
Vol 3 (3) ◽  
pp. 1
Author(s):  
E.R. Crain
Keyword(s):  
Computer Graphics ◽  
Data Processing ◽  
High Speed ◽  
Computer Processing ◽  
Geological Mapping ◽  
Magnetic Data ◽  
Mapping Data ◽  
Gravity And Magnetic ◽  
Gravity And Magnetic Data ◽  
Speed Computer

The application of high speed computer processing and computer graphics is reviewed and discussed in relation to manipulating and present geophysical, and geological mapping data.

Automatic 3-D interpretation of potential field data using analytic signal derivatives

Geophysics ◽  
1997 ◽  
Vol 62 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Nicole Debeglia ◽  
Jacques Corpel
Keyword(s):  
Signal Amplitude ◽  
Vertical Gradient ◽  
Analytic Signal ◽  
Magnetic Data ◽  
Practical Implementation ◽  
Potential Field Data ◽  
Gravity And Magnetic ◽  
Second Derivatives ◽  
Gravity And Magnetic Data ◽  
Derivatives Of

A new method has been developed for the automatic and general interpretation of gravity and magnetic data. This technique, based on the analysis of 3-D analytic signal derivatives, involves as few assumptions as possible on the magnetization or density properties and on the geometry of the structures. It is therefore particularly well suited to preliminary interpretation and model initialization. Processing the derivatives of the analytic signal amplitude, instead of the original analytic signal amplitude, gives a more efficient separation of anomalies caused by close structures. Moreover, gravity and magnetic data can be taken into account by the same procedure merely through using the gravity vertical gradient. The main advantage of derivatives, however, is that any source geometry can be considered as the sum of only two types of model: contact and thin‐dike models. In a first step, depths are estimated using a double interpretation of the analytic signal amplitude function for these two basic models. Second, the most suitable solution is defined at each estimation location through analysis of the vertical and horizontal gradients. Practical implementation of the method involves accurate frequency‐domain algorithms for computing derivatives with an automatic control of noise effects by appropriate filtering and upward continuation operations. Tests on theoretical magnetic fields give good depth evaluations for derivative orders ranging from 0 to 3. For actual magnetic data with borehole controls, the first and second derivatives seem to provide the most satisfactory depth estimations.

Sign in / Sign up

Export Citation Format

Share Document