Wave equation reflection travel-time inversion in acoustic media
Fu Jiyou1, Li Zhenchun1, Yang Guoquan1, Zhang Kai1, Liu Yujin2, Xie Yani3
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
2. Research Institute of Petroleum Exploration and Development, SINOPEC, Beijing 100083, China;
3. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China
Abstract：The key of reservoir characterization needs accurate background velocity field. Full waveform inversion(FWI) can recover higher wave number information of shallow layers. Transmitted wave and refracted wave usually have a larger incidence angle aperture; they can be used to recover the long wavelength components of the velocity model. While reflections have narrow incidence angle aperture, they are used to recover short wavelength components. Therefore, we rebuilt the reflections gradient to recover velocity model long wavelength components. We get reflections from the background velocity field using migration and demigration operators and construct the reflected wave paths. Then we establish a gradient formula of wave equation reflection travel-time inversion. During inversion process, we combine the ideas of Ma and Luo to improve the form of adjoint sources. We also modify the gradient formulation. Simultaneously dynamic image warping method is used for the time lag calculation between reflections. Finally we achieve a low wavenumber components inversion of velocity model using reflected wave information. Model tests demonstrate better stability and application potentiality of the proposed method.
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