生物礁地震响应特征的数值模拟

为了有效地识别生物礁的地震响应特征,采用频率-波数域的波动方程数值模拟方法,对时间剖面上生物礁的各种典型特征进行了数值模拟,提出了将地震正演与深度偏移相结合的地震数值模拟流程,有效地检验了生物礁解释成果的正确性。在二维模拟的基础上,采用三维波动方程延拓方法实现了三维环礁模型的地震数值模拟,得到了时间剖面上环礁的各种地震反射特征。理论和实际生物礁的模拟记录仅包含地震波的反射和绕射特征,信噪比高,有助于消除实际生物礁地震解释的多解性。

Numerical simulation on seismic response features of reef

Many features of reef in seismic time profile were numerically simulated by the way of F-K wave equation modeling to effectively recognize seismic response features of reef. A calculation program by combining seismic forward with depth migration was proposed to test the explanation for reef. Based on the 2-D seismic modeling, the continuation method of 3-D wave equation was applied to realize poststack forward modeling of 3-D atoll model. Many representative response features in different seismic profiles were obtained. The simulated synthetic records only contain the primary reflections and diffractions with high signal-to-noise ratio, which is available for eliminating the multiplicity of reef seismic interpretation.