摘要
准噶尔盆地南缘山前巨厚砾石覆盖区普遍存在严重的近地表各向异性问题,它所引起的非地表一致性对表层建模与静校正量计算有较大影响,对地震资料时间域成像的影响程度目前尚未有定性和定量的认识。为此,以准噶尔盆地南缘山前独南地区近地表各向异性调查为基础,通过模型正演明确了近地表为近似HTI介质,进一步通过所建立的各向异性正演模型落实了近地表各向异性对叠加剖面信噪比、成像精度以及叠加速度建模的影响,为后续各向异性反演与地震成像研究提供了参考依据。
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 nearsurface 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.
作者
刘宜文
张录录
马凯
尹丽丽
李莉
LIU Yiwen;ZHANG Lulu;MA Kai;YIN Lili;LI Li(Institute of Geophysics,Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Urumqi,Xinjiang 830013,China;Xinjiang Geophyscial Department,BGP Inc.,CNPC,Urumqi,Xinjiang 830000,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第S01期15-20,6-7,共8页
Oil Geophysical Prospecting
关键词
近地表
各向异性
HTI介质
模型正演
地震成像
静校正
near-surface
anisotropy
HTI medium
forward modeling
seismic imaging
static correction
