Interpretation of Gravity Anomalies with the Normalized Full Gradient (NFG) Method and an Example |
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| Authors: | Ali Aydin |
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| Institution: | (1) Faculty of Engineering, Department of Geophysics, Pamukkale University, 20017 Kınıklı, Denizli, Turkey |
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| Abstract: | The Normalized Full Gradient (NFG) method which was put forward about 50 years ago has been used for downward continuation
of gravity potential data, especially in the former Union of Soviet Socialist Republics. This method nullifies perturbations
due to the passage of mass depth during downward continuation. The method depends on the downwards analytical continuation
of normalized full gradient values of gravity data. Analytical continuation discriminates certain structural anomalies which
cannot be distinguished in the observed gravity field. This method has been used in various petroleum and tectonic studies.
The Trapeze method was used for the determination of Fourier coefficients during the application of this method. No other
techniques for calculating these coefficients have been used. However, the Filon method was used for the determination of
Fourier coefficients during the application of the NFG method in this work. This method, rather than the Trapeze method, should
be preferred for indicating abnormal mass resources at the lower harmonics. In this study, the NFG method using the Filon
method has been applied the first time to theoretical models of gravity profiles as example field at the Hasankale-Horasan
petroleum exploration province where successful results were achieved. Hydrocarbon presence was shown on the NFG sections
by the application of NFG downward continuation operations on theoretical models. Important signs of hydrocarbon structure
on the NFG section for field and model data at low harmonics are obtained more effectively using this method. |
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| Keywords: | Gravity anomalies Normalized Full Gradient (NFG) Filon method Hasankale-Horasan |
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