3D Gauss-FFT based gravity field forward modeling method
A three-dimensional gravity and three-dimensional technology, applied in the field of exploration geophysics, can solve the problems of poor calculation accuracy and low forward modeling efficiency, and achieve the effects of improving forward modeling accuracy, ensuring forward modeling calculation efficiency, and suppressing spooky source effects
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[0154] Example 1
[0155] The two-point 3D Gauss-FFT method is used to process the above-mentioned model using the method provided by the present invention.
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[0156] Example 2
[0157] The method provided by the present invention is used to process the above-mentioned model by a 4-point 3D Gauss-FFT method.
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[0158] Example 3
[0159] The 8-point 3D Gauss-FFT method is used to process the above model by using the method provided by the present invention.
[0160] The calculation time, maximum absolute error and required memory results for Examples 1 to 3 and Comparative Examples 1 to 6 are listed in Table 1. The result of forward performance is as Figure 5 As shown in (a)~(h).
[0161] Figure 5 (a) and Figure 5 (b) It can be seen that the forward modeling results obtained by using traditional 2D and 3D FFT methods are obviously underestimated. Compared with the analytical solution in the space domain, the gravity anomaly distribution of the results obtained by the traditional frequency domain forward modeling method is greatly distorted, especially the traditional 3D FFT method. From Figure 5 (e) and Figure 5 (f) It can be seen that the maximum absolute error is 4.5mGal and 9mGal respectively.
[0162] Figure 5 (c) and Figure 5 (d) The forward modeling results of the 4-node 2D Gau...
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