【摘要】 研究了压制与海面有关的地震勘探多次反射波的两种方法。两种方法均以波动方程为基础。当地震子波已知时 ,可在频率波数域中通过子波反褶积方法消除与海水表面有关的多次波 ;在未知子波的情况下 ,可依据消除多次波后波场能量最小为准则 ,求出一滤波因子 ,用它去标定估计的多次波 ,然后从地震记录中减去预测的多次波 ,达到压制它们的目的。为了降低维数 ,x、y的二维空间坐标用柱坐标的径向距离代替 ,其波数通过汉克尔变换求得。更多还原

【Abstract】 Two methods for suppressing free surface multiple is put forward ,which are based on the wave equation . When the wavelet is known, the free surface multiples can be removed by wavelet deconvolution in f k domain; provided the wavelet is unknown, we can use the so called minimum energy criterion to estimate the inverse of the source wavelet (a filter).Finally, using the filter to scale the predicted multiples and subtracting them from seismic data, the free surface multiples are suppressed. To reduce the dimensions, radial distance of cylindrical coordinates replaced 2 D spatial coordinates ( x,y ),and the radial wavenumber is obtained by a Hankel transform with respect to radius.更多还原