Seismic inversion method and device
A seismic inversion and inversion technology, applied in the field of geological exploration, can solve problems such as poor inversion effect
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example 1
[0105] Example 1: The Marmous2 model is tested using the seismic inversion method proposed in this application, and the converted wave elastic impedance inversion is performed on the noise-free data according to the previous steps S101 to S107. figure 2 It is a schematic diagram of the comparison of the initial model (a), the real data (b) and the inversion result (c) of the converted wave elastic impedance with an incident angle of 6 degrees. image 3 It is a schematic diagram comparing the initial model (a), real data (b) and inversion results (c) of the converted wave elastic impedance with an incident angle of 16 degrees. Figure 4 It is a schematic diagram comparing the initial model (a), real data (b) and inversion results (c) of the converted wave elastic impedance with an incident angle of 26 degrees. Use separately figure 2 (a), image 3 (a) and Figure 4 (a) Perform inversion to obtain inversion results figure 2 (c), image 3 (c) and Figure 4 (c). In the f...
example 2
[0106] Example 2: The Marmous2 model is tested using the seismic inversion method proposed in this application, and the converted wave elastic impedance inversion is performed on the synthetic data with a signal-to-noise ratio of 5 according to the previous steps S101 to S107, Figure 7 as well as Figure 8 The comparisons between the real data and the inversion results of the shear wave velocity and density of the synthetic data with a signal-to-noise ratio of 5, and respectively Figure 7 (a) and (b) in, Figure 8 (a) and (b) in (a) and (b) show that even if the synthetic data contains noise, the inverted shear wave velocity and density at the well location of the verification well can still match the actual well curve very well, and the accuracy of the calculation result is high. It shows that the invention has strong noise immunity.
example 3
[0107] Example 3: Use the seismic inversion method proposed in this application to test the actual well curve in a certain area, and perform converted wave elastic impedance inversion on the noise-free data according to the previous steps S101 to S107, Figure 9 (a), (b) and (c) are the initial model (thick dotted line), real curve (solid line) and inversion result (thin dotted line) of the converted wave elastic impedance with incident angles of 6 degrees, 16 degrees and 26 degrees ) comparison display. Figure 9 (a) SEI(6 degrees) represents the converted wave elastic impedance with an incident angle of 6 degrees, Figure 9 (b) SEI(16 degrees) represents the converted wave elastic impedance with an incident angle of 16 degrees, Figure 9 (c) SEI (26 degrees) represents the converted wave elastic impedance with an incident angle of 26 degrees, Figure 9 (d) Vs represents the shear wave velocity (in m / s), Figure 9 (e) den means density (unit is g / cm 3 ). From these 5 fig...
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