带限局部平面波传播算子与偏移方法

发布时间：2018-06-24 01:08

  本文选题：射线束偏移 + 带限信号　； 参考：《石油地球物理勘探》2017年05期

【摘要】：地震信号的带限特点限制了高频近似下的射线类算子在地震波模拟和偏移中的应用。本文基于射线理论构建带限信号局部平面波传播算子,兼顾射线类方法具有时空局部性和实现灵活高效的特点,有效进行带限地震波场的模拟和偏移。即分析传统高频射线在速度界面的传播特征,利用带限信号频带与菲涅耳带的关系,构建带限斯奈尔定律进行中心射线传播;在局部平面波假设下,基于带限中心射线做旁轴近似展开,构建带限局部平面波传播算子;在此基础上发展基于该算子的带限射线束偏移方法。数值实验结果表明,带限射线束较传统基于高频近似的射线束具有更强穿透能力,改善射线阴影区照明,从而提高复杂构造区成像质量。
[Abstract]:The band limit of seismic signal limits the application of ray-like operators in high frequency approximation to seismic wave simulation and migration. Based on ray theory, the local plane wave propagation operator of band-limited signal is constructed in this paper. The radiographic method has the characteristics of space-time localization and realization of flexibility and efficiency, so the simulation and migration of band-limited seismic wave field are carried out effectively. That is, analyzing the propagation characteristics of the traditional high frequency ray at the velocity interface, using the relation between the band limited signal frequency band and the Fresnel band, constructing the band limited Snell law for the central ray propagation, under the assumption of local plane wave, Based on the paraxial approximation of the band-limited central ray, the band-limited local plane wave propagation operator is constructed, and the band-limited ray beam migration method based on this operator is developed. The numerical results show that the band-limited ray beam has a stronger penetrating ability than the traditional high-frequency approximation ray beam and improves the illumination of the shadow region of the ray, thus improving the imaging quality of the complex structure area.
【作者单位】： 中国地质大学地球物理与空间信息学院;地球内部多尺度成像湖北省重点实验室;中国石化油田勘探开发事业部;
【基金】：国家重大专项(2016ZX05026001-001) 国家自然科学基金(41604092) 中国博士后科学基金(2016M590725) 中国石化国家重点实验室开放基金(33550006-16-FW0399-0021)等联合资助
【分类号】：P631.4
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本文编号：2059283