Abstract：Current anisotropic tomography methods mainly use the information of different offset ranges or information of angle domain common imaging gathers (ADCIGs) to perform the anisotropic parameter inversion,but lack the definition of partition in ADCIGs.Firstly,according to the travel time first-order partial derivative to Thomsen parameter and the travel time second-order partial derivative to Thomsen parameter and phase angle,the range of small,medium and large ADCIGs is clearly defined.Then the basic velocity field is established by an isotropic one-way wave migration and velocity tomography.The ADCIGs of VTI media inverse-time migration is extracted by Poynting vector method.Finally,we can develop a method to invert the VP0 with the small angle range gathers information,δ with the middle range,and ε with the large range.Trial results of a simple concave model illustrate the correctness of the proposed method,and trial results of a complex structural model verify the applicability of the proposed method.
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