Research On The Method And Application Of Anisotropic Parameter Estimation For TI Media

With the development of seismic exploration technology,seismic data processing and interpretation based on isotropic media can not accord with the requirements of accurate description of underground complex structure.The study of anisotropic media has already put on the agenda.And accurately estimated the anisotropic parameters of underground media are particularly important for tectonic imaging,lithology identification and reservoir description.The anisotropy involved in the current seismic exploration mainly refers to the velocity anisotropy of the formation.The main causes of the anisotropy of the velocity can be summed up in two ways: one is the external anisotropy,which is generated by the thin layer cycle deposition formed by the deposition of the formation.In the actual research and processing is based on a vertically symmetrical spindle and lateral isotropic horizontal layered media(VTI media).The other is the internal anisotropy,that is,from the directional arrangement of diagenetic minerals and fractures.But in this paper,we studied not only limited to velocity,but also the other anisotropic parameters.In this paper,the anisotropy parameter estimation is carried out from three aspects.First,the longitudinal and transverse wave velocities of the anisotropic parameters are measured directly by rock physics.The results are used to constrain the verification of the next two methods.Then based on VSP Data to estimate the anisotropy parameters.Since the effects of velocity and anisotropy parameters on the travel of seismic waves are mutually coupled,the VSP observation method can obtain the exact velocity of the underground depth and decouple the velocity and anisotropy parameters in the parameter estimation The 3D VSP data can provide more available information that can be used to directly estimate anisotropy parameters or to constrain anisotropic parameter inversion.Finally,the anisotropy parameters are estimated by using the method of thickness comparison of well rock formation,and the first two methods are used to constrain.In the fourth chapter,we briefly describe the basic principle of TI media tomography,and use the anisotropic parameter estimation method in Chapter 3 to verify the proposed method by TTI media anisotropic parametric inversion and modeling.The applicability and accuracy have been proved.At last we achieved a relatively good result.