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| | Aimed to an approach that derives the 3-D nearsurface velocities,on which the reasonable field static values for complex nearsurface can be calculated, from the arrival time of first break by using tomography technology. The approach is two steps included the forward and inversion. Shortest Path Ray Tracing is used in the forward step to calculate first break time as well as ray path and SIRT (Simultaneous Iterative Reconstruction Technology) in the inversion step to determine the adjustment to previous nea... | | 针对复杂山地的静校正问题,研究了利用基于初至时间的3D表层速度层析反演技术。给出了反演方法的基本原理,即采用基于最短旅行时原理的射线路径追踪法计算初至波的路径和旅行时,采用同时迭代重建技术(SIRT)计算速度修正量,修改速度模型。最终的速度模型通过正演和反演多次迭代获得,不依赖于初始模型。用一个速度变化复杂的理论模型对该方法进行了试算,结果表明,该方法很好地重建了横向剧烈变化的3D速度结构。对南方某山地3D资料处理结果表明,用该方法可以获得可靠的3D近地表速度模型和静校正量。 | | 文摘来源 | | With complicated surface and underground geologic conditions, several problem that Qaidam Basin has been facing with includes not-ideal static correction and low signal-to-noise while seismic data processing. Through the research on the technology of static correction in mountainous region and disturbing wave denoising, it is proposed that the method integrating static correction, migrated imaging with denoising is used to improve the quality of seismic profile in complicated structure area to reflect the u... | | 柴达木盆地复杂的地表地质条件和地下地质条件,使其在地震资料处理中存在着严重的静校正和低信噪比问题。通过重点研究山地静校正、干扰波去噪技术,提出了利用静校正、偏移成像、去噪技术相结合的方法,以提高复杂构造地区地震剖面的品质,合理反映复杂地区的地下地质特征,该方法在冷湖七号、狮子沟等地区的应用,取得了初步效果。 | | 文摘来源 | |   |
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