薄层VTI介质中地震反射系数及相位响应

The reflection coefficient and phase in thin VTI medium

本文从波动方程出发,推导了平面波在砂泥岩薄互层VTI介质中界面上的反射系数和相位特征;结果表明反射系数与反射系数的相位有关,以及反射系数会发生接近-90°相位旋转,理论上证明了Zeng的结论.模型数值试验及实际资料处理结果均表明,地震反射波的薄层与厚层的响应特征存在明显的差异.因此当前广泛应用的AVO及波阻抗反演等储层预测和油气检测技术等,均需要充分考虑并完善薄层的影响效应.

On the basis of wave equation, this article derive out reflection coefficient and the phase character of plane P-wave, which generated on the interface of VTI medium in thin sand shale interbedding. And the result indicates that reflection coefficient is affected by its phase and it could get phase rotation about--90°, what prove Zeng＇s conclusion theoretically. Both numerical experiment of model and results of practice data processing indicate seismic reflection waves have obvious different character in thick and thin layer. So the reservoir forecast and detection of hydrocarbon, which are widely used techniques presently, such as AVO and wave impedance inversion, all need to consider and complete the influence of thin layer.