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广泛发育裂缝的泥灰岩储层具有复杂的黏弹性和各向异性性质,使得地震波在其中的传播机理尚不完全清楚,这成为制约该类储层油气勘探取得进一步突破的重要因素。综合考虑裂缝储层的各向异性与黏弹性性质,利用Kelvin-Voigt黏弹性模型、线性滑动裂缝模型与Hudson模型,构建了黏弹性各向异性裂缝性储层等效介质模型;采用旋转交错网格有限差分算法近似计算空间导数,同时采用复频移递归积分非分裂PML边界条件来吸收边界反射,进而对所建立的等效介质模型的地震波场进行数值模拟。研究结果显示地震波传播特征受基质Q值、裂缝充填流体、裂缝体密度及裂缝倾角与方位角等参数的影响。
The widely-developed fractured marl reservoir has complex viscoelastic and anisotropic properties, so that the propagation mechanism of seismic waves in it is not fully understood, which becomes an important factor restricting the further breakthroughs in the exploration of such reservoirs. Considering the anisotropy and viscoelastic properties of fractured reservoirs, an equivalent medium model of viscoelastic anisotropic fractured reservoir was constructed by using Kelvin-Voigt viscoelastic model, linear sliding fracture model and Hudson model. The rotational staggered network The lattice finite difference algorithm approximates the space derivative, and uses the complex frequency shift recursive integral non-split PML boundary conditions to absorb the boundary reflection, and then simulates the seismic wavefield of the equivalent medium model. The results show that the seismic wave propagation characteristics are affected by the Q value of the matrix, the fluid filled in the fractures, the density of the fractures and the dip and azimuths of the fractures.