摘要
在起伏地表构造条件下,共中心点反射已不复存在,其波场特征较为复杂,速度分析时受浅层动校畸变影响较大,加上其他干扰因素,利用常规处理手段已很难得到较为准确的近地表构造和起伏地表浅层的叠加速度.为此,设计了两个物理模型,利用地震物理模拟实验数据采集系统对模型进行了数据采集.在采集到的地震物理模拟数据的资料处理过程中,对单炮记录进行向上延拓,然后再进行速度分析,并在动校正后多次调整叠加速度来得到视叠加速度,从而避免了浅层动校畸变大的影响.物理模型的模拟实验及处理结果表明,向上延拓是解决近地表构造和起伏地表浅层叠加速度的有效手段,通过向上延拓处理可以得到较为准确的近地表构造的视叠加速度,利用这样的叠加速度成像,可以得到近地表构造和起伏地表浅层构造较为真实有效的信息.
In the relief surface structure conditions, CMP reflection has gone, the wave field characteristic is more complicated, velocity analysis under shallow NMO distortion influence is bigger, with other interference factors, using conventional processing methods has been hard to get more accurate the stacking velocity of near surface and relief surface structure. For this reason, we designed two physical models, and acquired seismic modeling data using the seismic physical modeling data acquisition system. Upward continuation in shot records were used in the processing of the seismic physical modeling data. Then, velocity analysis is accomplished. On this basis, several adjustments with the stacking velocity after NMO were used to obtain the Visual stacking velocity, so as to avoid the impact of the shallow NMO distortion. The physical modeling and processing results show that the upward continuation is an effective means to solve the stacking velocity of near-surface and relief surface structure, upward continuation treatment can get more accurate the Visual stacking velocity of the near-surface structure, the use of this stacking velocity imaging can obtain real and effective information of the near-surface and relief structure. Thereby, it can increase the accuracy and reliability of the data interpretation, understanding the structure and its distribution pattern of the near-surface is also Conducive. This method has a certain degree of guiding significancefor the seismic survey design and data processing.
出处
《地球物理学进展》
CSCD
北大核心
2013年第3期1417-1424,共8页
Progress in Geophysics
基金
国家973项目(2011CB202402)
国家科技重大专项(2011ZX05035-001与2011ZX05005-005-001)联合资助
关键词
向上延拓
叠加速度
视叠加速度
动校畸变
替换速度
Upward continuation, Stacking Velocity, Visual stacking velocity, DMO distortion, Replace Velocity
