多尺度随机孔洞介质地震波正演及其逆时成像

Seismic Wave Forward Simulation and Reverse-time Migration with Multi-Scale Random Carve Medium

常规地震勘探理论无法完全解释复杂多变的地质特征,较难达到高精度地震资料处理的目的,因此必须发展适应复杂非均匀介质的地震波场传播理论,以更好地刻画真实的复杂构造、岩性、裂隙油气藏的特点。根据实际火山岩样的随机特征,构建了相应的多尺度组合型随机孔洞介质模型,并进行了高精度地震波正演数值模拟和逆时成像研究,制作了在不同频率条件下的自激自收剖面和逆时偏移剖面,计算结果表明,构建的多尺度随机孔洞介质模型可以有效模拟真实的地质变化特征,同时指出准确区分由地层随机非均匀性引起的散射波场响应和干扰信号是实现高分辨率地震勘探的前提。

The conventional seismic prospecting theory can＇t completely interpret some complex variable seismic property,and can hardly achieve the purpose of high-precision seismic data processing;Therefore,it is necessary to develop a seismic wave theory fit for complex non-homogeneous medium to depict the characteristics of the real complex structure,lithologic,cranny reservoir correctly.According to the random character of the practical volcanic samples,the paper constructs corresponding multi-scale random carve model and carries out the forward numerical simulation and reverse-time migration,therefore,horizontal stack section and its reverse-time depth migration section with high or low frequency are created,the numerical results show that,the created multi-scale random carve models can effectively simulate the real geological variable character,and at the same time,the paper also points out that correctly distinguishing the scattering wave field raised by the random heterogeneous formation from the invalid signal is the prerequisite of the high-resolution seismic prospecting.