【摘要】 哈萨克斯坦滨里海盆地盐下地震勘探存在盐丘屏蔽、干扰波发育、反射波能量弱、先验资料缺乏以及因速度异常引起的构造假象等问题。通过合理组织处理流程,有效压制了面波干扰、规则干扰、强能量干扰和随机噪声干扰;采用由粗到细的思路,先利用谱分析方法建立宏观速度场,再利用射线层析成像方法提高速度分析精度,建立了较为准确的速度模型;利用频率-空间域有限差分叠前深度偏移解决了盐下及盐丘侧翼的成像问题。上述特色处理技术的应用,使得哈萨克斯坦滨里海盆地盐下及盐丘侧翼反射清楚,有效消除了由速度异常造成的构造假象。更多还原

【Abstract】 There exist some problems in subsalt seismic exploration of Caspian seashore basin,such as salt doom screening,interference wave development,weak energy of reflected wave,shortage of pri- or data and pseudo-structures caused by velocity anomaly,etc.Ai- ming at these problems,we have designed the processing workflow to effectively suppress the surface wave interference,regular inter- ference,high energy interference,and other random noise interfer ence.The treatment clue was from thick to thin.Firstly,the spec- tral analysis method was used to establish macroscopic velocity field.Then,the ray tomography method was used to enhance the accuracy of velocity analysis and to establish a more accurate veloci- ty model.Finally,the finite difference pre-stack depth migration method in f-k domain was adopted to solve the imaging problem of subsalt and salt dome flank.The data processing result demon- strates that using the above treatment scheme can clearly image the subsalt and salt dome flank and effectively remove the structure ar tifacts caused by the velocity anomaly.更多还原