生物礁模型波动方程正演模拟及其地震响应特征分析

Forward Modeling of Organic Reef Model Wave Equation and Analysis of Seismic Response Characteristics

为了解生物礁储层地震响应特征,建立典型的储集层模型,利用数值模拟技术模拟碳酸盐岩内部不同孔隙度条件下的地震响应特征。研究表明:①在相同孔隙度不同流体情况下地震反射波组特征差异较小,在相同流体不同孔隙度的情况下,地震反射波组特征差异较大。总体上看,孔隙度比流体对地震响应特征的影响更大,但不同流体情况下礁体底界的反射特征有一定差异。②正演模拟地震记录的叠前反演结果表明Vp/Vs(纵波速度/横波速度)、泊松比和拉梅常数对流体性质均比较敏感。③在叠前反演获得的各参数中,纵波阻抗和密度参数反演效果最好,横波阻抗和Vp/Vs参数次之。

A typical reef reservoir model is Established,wave equation prestack numerical simulation technology is used to simulate different internal porosities of reef seismic response.The result shows that the characteristics of organic reef reservoir porosity change the seismic response characteristics significantly,different fluid reef reservoir models are established to simulate different seismic response characteristics of reef reservoirs,the same porosity with different fluids reef has little difference seismic response characteristics,effect of porosity on the seismic response characteristics is greater than that of fluid.Inversion results indicate that Vp /Vs is sensitive to identified fluid property,the accuracy of prestack elastic inversion results show that the P-wave impedance and density parameter inversion are the best,S-wave impedance and Vp /Vs parameter are the next.