倾斜平面波地震剖面的F-K正演模拟及偏移

MODELING AND MIGRATION OF TILTED PLANE-WAVE PROFILES USING F-K TRANSFORMS

1. 成都地质学院;2. 美国休斯敦大学

向地下发射常速传播的下行倾斜平面波,经反射后在地面上用等间隔分布的检波器接收,这样得到的模拟剖面与通常的CDP正演模拟剖面相似,所不同的是需要在傅氏频率域中作二维插值。实验表明,最少得用8×8个插值项才能避免在结果中出现假同相轴。在偏移程序中同样需要二维插值。正演(模拟)及反演(偏移)程序均以数值模型和物理模型资料进行了实验。

The response of the earth to a downward travelling tilted plane wave as measureu by equally spaced receivers on the surface of the earth is modeled using a constant velocity of propagation. The algorithm is similar to the standard CDP modeling program except that a two-dimensional interpolation is required in the Fourier domain. It was found that at least an 8×8 point operator was required to give a result free of spurious events. The inverse program also requires two-dimensional interpolation. Both programs have been tested with numerical and physical model data.