1. School of Ueosciences, China University of Pe-troleum(East China), Qingdao, Shandong 266555, China;
2. Exploration and Development Research Institu-te, Southwest Oil&Gas Field Company, Petro China, Chengdu, Sichuan 610051, China
Abstract：With the assumption of incident plane wave and whole-solid anisotropic media,we derive the reflection/transmission coefficients for the TTI(Tilted Transverse Isotropy)horizontally-layered media in frequency-slowness domain,and analyze how the anisotropy parameters affect the AVO properties of the reflected primary wave and secondary wave from the synthesized seismogram inτ-pdomain.By means ofτ-ptransformation and iterative similarity coefficients weighting method, we can compose the spherical wave,and suppress the truncation effect from integration.The following understandings are obtained from the study:① It is efficient to suppress truncation effect from integration by combiningτ-ptransformation and iterative similar coefficients weighting method.② For reflected primary wave,parametersθ,ε,δin TTI media control wide-angle incident wave and also small-angle incident wave.In VTI media,εcontrols wide-angle incident wave,andδ controls small-angle incident wave.As to reflected secondary wave,it needs to be further studied about how AVO properties affected by anisotropy parameters.③ Due to the impact of anisotropy in the layer,different anisotropy parameters lead to different synthetic seismogram in the reflectivity method.Here,the synthetic seismogram of reflected primary wave and secondary wave using reflectivity method in TTI medium has nothing to do with decoupling problems.Model tests demonstrate that this proposed method enjoys high precision and efficiency.
