【摘要】 受采集方式和环境的影响,海上三维拖缆地震资料的覆盖次数是不均匀的,要进行面元均化处理,传统的借道均化方法存在误差,影响叠前时间偏移的效果。为此,探讨了沿Inline和Crossline两个方向进行地震道插值实现CMP面元中心化的方法。首先对传统静态和动态面元均化方法进行了讨论,并进行了误差分析;然后阐述了双向插值面元中心化处理的基本原理和实现步骤;最后以渤海某区域三维拖缆资料面元中心化处理为例,分析了双向插值面元中心化方法的可靠性。与传统借道方法的叠前时间偏移结果进行了对比,结果表明双向插值面元中心化方法可以提高振幅的保真度,改善偏移成像的信噪比,提高成像精度。更多还原

【Abstract】 The fold of 3D offshore streamer seismic data is uneven for the influence of acquisition mode and environment,which needs bin equalization. Conventional bin equalization method uses the adjacent traces,which leads to error and impacts the effect of prestack time migration.Therefore,we discussed interpolating seismic traces in inline and crossline directions to realize CMP bin centralization. Firstly,the traditional static and dynamic bin equalization methods were discussed,and the error was analyzed.Then,the basic principles and steps of bin centralization interpolating in two directions were demonstrated.Finally,the bin centralization processing on some 3D offshore streamer seismic data was taken as an example to analyze the reliability of the two-directional interpolation bin centralization. Compared to the prestack time migration results obtained from traditional method,the result shows that the two-directional interpolation bin centralization can increase the preservation of amplitude,improve S/N and raise imaging accuracy.更多还原