基于褶积模型的地震振幅含义讨论

Discussion of the Meaning of Convolution Model-Based Seismic Amplitude

根据褶积模型,反射波振幅是单个反射系数和子波褶积的叠加,一次反射地震记录的振幅从本质上说是有限带宽的反射系数,地震剖面的同相轴表示了地层的波阻抗差界面,并不是等时的,结合地层对比的依据说明波阻抗并不能完全反映地层的岩性,仅用波阻抗预测岩性是不准确的。在此基础上,结合模型和实例说明,同相轴的尖灭并不表示储集层的尖灭。

Based on convolution model, the reflected wave amplitude is the superposition of single reflection coefficient and wavelet convolution. The amplitude of primary seismic reflection seismogram can be regarded as the limited bandwidth reflection coefficient in nature, while the event of seismic profile stands for the interface of wave impedance contrast of layers, which is not consistent with deposition interface. This paper illustrates wave impedance can not completely reflect the lithology of strata by eombining with stratigraphie correlation, so it is inaccurate to only use the wave impedance for prediction of lithology. Also, this paper indicates from the model and cases that the pinehout of event does not express the pinchout of reservoir.