基于波动方程的检波点二次定位

在进行浅海过渡带地震资料采集时,需要将电缆和检波器沉放到海底,由于洋流、潮汐等因素的影响会使检波点的实际位置与预设位置不同,从而严重影响了后续的地震资料处理工作,因此需要对检波点进行二次定位.在海底检波点二次定位中,炮点位置已知而检波点位置未知,需要从多个炮点位置正向外推波场,使波场逐步延拓到检波点,以此来获得检波点的...

The secondary positioning of receiver based on wave equation

The real position of receiver and ocean bottom cable is different from the designed position because of the influence of ocean current and tide which seriously affect the sequent processing of seismic data,so it's necessary to reposition the receiver.During the secondary positioning of receiver,as the position of shot point is known,the wave fields can be extrapolated from lots of shot points, and at last reached the position of receiver,thus,the position of the receiver can be found out.Specifically,the first step is dividing grids on the sea floor,then with the help of Kirchhoff integral,the energy of the grids comes out,and the grid with high energy is the position of the receiver.The gird's interspacing is large when dividing the grid for the first time,then decrease the distance between the grids.Thus,the arithmetic can speed up,and the accuracy can be guaranteed.The direct wave is the most important information in the secondary positioning of receiver,and it propagates through the sea water.So the velocity should be the same as the velocity of the sea.Both the simulating and real data processing results confirm that the secondary positioning of receiver is feasible.