3D two-layer VTI/orthorhombic model

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3D two-layer VTI/orthorhombic model

Figure 7 shows synthetic vector displacement fields using the proposed approach for a 3-D two-layer model, with a horizontal reflector at 1.167 km. The first layer is a VTI medium with $v_{p0}=2500 m/s$ , $v_{s0}=1400 m/s$ , $\epsilon=0.25$ , $\delta=0.05$ , and $\gamma=0.15$ , and the second is an orthorhombic medium representing a vertically fratcured TI formation (Tsvankin, 2001; Schoenberg and Helbig, 1997), which has the parameters $v_{p0}=3000 m/s$ , $v_{s0}=1600 m/s$ , $\epsilon_1=0.30$ , $\epsilon_2=0.15$ , $\delta_1=0.08$ , $\delta_2=-0.05$ , $\delta_3=-0.10$ , $\gamma_1=0.20$ and $\gamma_2=0.05$ . A exploration source is located at the center of the model. We achieve efficient simulation of dispersion-free 3D elastic wave propagation for the decoupled and total displacement fields. Shear wave splitting can be observed in the qS-wave fields.


ElasticPx,ElasticSx,Elasticx,ElasticPy,ElasticSy,Elasticy,ElasticPz,ElasticSz,Elasticz Figure 7. Synthesized decomposed and total elastic wavefields for a orthorhombic model with a VTI overburden: qP (left), qS (mid) and total (right) elastic displacement fields (top: x-component, mid: y-component, bottom: z-component).

Next: SEG Hess VTI model Up: examples Previous: 2D two-layer VTI/TTI model

2016-11-21