复杂区三分量转换波数据处理技术

3C converted wave data processing techniques in complex area

转换波数据处理较常规纵波数据处理更为复杂,在复杂区表现尤为明显,主要表现在静校正问题突出,信噪比低,振幅补偿及成像难度大,共转换点(CCP)叠加方法难以实现转换波的正确成像。本文利用配套的静校正技术逐步解决静校正问题,对于各种噪声采用针对性的手段压制,经过振幅补偿和叠前反褶积等处理,形成一套转换波迭代的静校正、叠前去噪、偏移速度分析及叠前时间偏移成像的处理流程。实际数据处理结果表明,运用这套处理流程,获得了较好的三维转换波成像数据体,为纵波、转换波数据联合解释、提高油气识别精度提供了条件。

With its many obvious advantages in lithology and fracture exploration,3C seismic exploration is favored in practical application,so more and more 3C exploration are being used.The data processing for converted wave data is more complex than the routine data,especially in the complex areas.The main problems include static correction,low signal to noise ratio,difficulties for amplitude compensation and imaging,and difficult to realize correct imaging for the converted wave by CCP method.Therefore,by using the matching static correction method to solve the static correction problem and the targeted means to suppress various noises,through the amplitude compensation and pre-stack deconvolution processing,a set of converted wave iteration processing flowchart,including static correction,pre-stack denoise,migration velocity analysis and pre-stack migration imaging,was developed.The field date processing result showed that the better quality 3D converted wave data volume was acquired by applying the flowchart,laid the foundation for converted wave data integrated interpretation and raising oil & gas identification accuracy.