Investigation of near-surface anisotropy and its influence on seismic imaging in Dunan area of piedmont at southern margin of Junggar
LIU Yiwen1, ZHANG Lulu2, MA Kai1, YIN Lili1, LI Li1
1. Institute ofGeophysics, Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Urumqi, Xinjiang 830013, China; 2. Xinjiang Geophyscial Department, BGP Inc., CNPC, Urumqi, Xinjiang 830000, China
Abstract：Serious near-surface anisotropy is common in the piedmont areas covered by huge-thick conglomerate at the southern margin of the Junggar Basin. The consequent non-surface consistency has a great impact on surface modeling and statics calculation. In addition, no qualitative and quantitative understanding of the impact of near-surface anisotropy on time-domain imaging based on seismic data is currently available. For this reason, the near-surface anisotropy in Dunan area of piedmont at the southern margin of the Junggar Basin is investigated. On this basis, the forward modeling conducted reveals that the near-surface is an approximate horizontal transverse isotropic (HTI) medium with a north-south axis of symmetry. Furthermore, the anisotropic forward model built in this study is utilized to determine the influences of near-surface anisotropy on the signal-to-noise ratio of the stacked section, imaging accuracy, and stacking velocity modeling. This study provides a reliable basis for subsequent research on anisotropic inversion and seismic imaging.
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LIU Yiwen, ZHANG Lulu, MA Kai, YIN Lili, LI Li. Investigation of near-surface anisotropy and its influence on seismic imaging in Dunan area of piedmont at southern margin of Junggar. Oil Geophysical Prospecting, 2022, 57(s1): 15-20.
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