Multi GPU calculation based reverse time migration imaging method of 3D TTI medium
A technology of reverse time migration imaging and media, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as extended time, inaccurate separation of surface wave types, and neglect of wave field vector properties
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Embodiment 1
[0100] Using the three-dimensional TTI medium reverse time migration imaging method based on multi-GPU calculation of the present invention, implement reverse time migration imaging on the two-dimensional BP2007TTI model. The model grid is 12596×1801, the corresponding grid spacing is 6.25×6.25m, and the minimum and maximum offset distances are 10025m and 37.5m. Figure 12 The results of anisotropic imaging and isotropic imaging of TTI media are shown respectively. Obviously, anisotropic imaging has clear imaging of steep interfaces and good energy focus, especially for the central salt dome with steep dip angle and strong anisotropy.
Embodiment 2
[0102] The three-dimensional TTI medium reverse time migration imaging method based on multi-GPU calculation of the present invention is used to perform reverse time migration imaging on the three-dimensional TTI salt dome model. The model grid is 901×901×501, and the corresponding grid spacing is 15×15×10m. The shot distance is 120m, the receiver point distance is 30m, the recording time is 8s, and the sampling time interval is 4ms. Figure 13 The TTI reverse time migration imaging results in the two main survey line directions are shown. Here we only show the velocity and inclination parameters in the model parameters. The imaging results show that the imaging homing of the target salt dome is accurate and the imaging effect is good.
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