两种海底多分量波场分离方法的模型测试及改进

发布时间：2018-10-25 09:25

【摘要】：海上多分量地震勘探能够提供丰富的海底地层信息,有效降低常规纵波勘探的多解性,在气云成像和流体检测等方面具有优势。由于海上多分量资料一般由四分量海底电缆(4C-OBC)采集,可以同时记录上行和下行纵、横波,因此波场分离处理十分关键。首先介绍了SCHALKWIJK和EDME两种常用的波场分离计算公式,然后采用海底水平多层介质模型对其进行了测试,并与在波场延拓时采用亥姆霍兹算子和坡印廷矢量分离得到的上行和下行纵、横波理论记录进行了对比;最后,针对两种常用波场分离计算公式无法剥离上行微屈反射等干扰波的问题,根据海底界面波型转换关系推导得到上行声波有效反射波和PP型纵波的计算公式,可以有效剥离水检上行分量的微屈反射和上行纵波分量的转换纵波。
[Abstract]:Multi-component seismic exploration on the sea can provide abundant undersea stratigraphic information, effectively reduce the multi-solvability of conventional P-wave exploration, and have advantages in gas cloud imaging and fluid detection. Since marine multi-component data are generally collected by four-component submarine cable (4C-OBC), the upstream and downlink longitudinal and shear waves can be recorded simultaneously, so the separation and processing of wave field is very important. In this paper, two commonly used formulas of wave field separation, SCHALKWIJK and EDME, are introduced, and then the horizontal multilayer media model is used to test them. The results are compared with the upward and downward longitudinal and shear wave records obtained by using Helmholtz operator and Poynting vector in wave field continuation. Finally, Aiming at the problem that two commonly used formulas of wave field separation can not peel off the interference waves such as uplink micro-flexion reflection, the formulas of effective reflection wave and PP type longitudinal wave are derived according to the wave transformation relation between the interface of sea bottom. It can effectively peel off the micro-flexion reflection of the uplink component and the conversion P-wave of the uplink P-wave component.
【作者单位】：中海油研究总院;中国科学院地质与地球物理研究所;中国地质大学地球物理与信息技术学院;
【基金】：国家杰出青年科学基金项目(41425017)资助~~
【分类号】：P631.46

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