基于改进的BISQ地震波储层参数反演
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摘要
Biot流动和喷射流动是含流体多孔隙介质中流体流动的两种重要力学机制.利用同时处理这两种力学机制的BISQ(Biot-Squirt)模型的流体压力表达式十分复杂,于是提出了不含特征喷射流动长度的改进BISQ模型。文中基于改进的BISQ模型,利用非常快速模拟退火算法实现了储层参数(孔隙度、渗透率、含流体饱和度等)的反演.结果表明,在储层参数的反演过程中,改进的BISQ比BISQ模型具有更强的抗"噪声"干扰性能,当观测噪声ε≤5%时,储层参数的反演精度很高,是一种可行的反演BISQ模型。
The Biot-flow and Squirt-flow mechanisms are two important mechanisms of fluid flow in porous media with fluid.Dvorkin and Nur presented an unified BISQ(Biot-Squirt) model,but it is complex in fluid-pressure equation.A.presented a modified BISQ model without the squirt flow length based on BISQ mechanism.In this paper,based on the BISQ model,we perform the inversion of reservoir parameters(e.g.,porosity,permeability,and saturation) by using the Very Fast Simulated Annealing algorithms(VFSA).Numerical experiments indicate that during the process of reservoir parametric inversion the convergence of objective function is speedy,and our algorithms have the property of strongly protecting noises of observations.The results of reservoir parametric inversion are very precise while the errors of observation are less than 5%.Finally,the practical inversion of experimental data proves that our algorithms are effective.
The Biot-flow and Squirt-flow mechanisms are two important mechanisms of fluid flow in porous media with fluid.Dvorkin and Nur presented an unified BISQ(Biot-Squirt) model,but it is complex in fluid-pressure equation.A.presented a modified BISQ model without the squirt flow length based on BISQ mechanism.In this paper,based on the BISQ model,we perform the inversion of reservoir parameters(e.g.,porosity,permeability,and saturation) by using the Very Fast Simulated Annealing algorithms(VFSA).Numerical experiments indicate that during the process of reservoir parametric inversion the convergence of objective function is speedy,and our algorithms have the property of strongly protecting noises of observations.The results of reservoir parametric inversion are very precise while the errors of observation are less than 5%.Finally,the practical inversion of experimental data proves that our algorithms are effective.
引文
[1]BOITM A.Theory of Propagation of ElasticWaves in a Fluid-Saturated Porous Solid[J].J Acoust Soc Amer,1956,28(2):168.
[2]DVORKIN J,NUR A.Dynamic poroelasticity:A unified model with the squirtand the Boit mechanisms[J].Geophysics,1993,58(4):524.
[3]MAMADOU S D,ERUWIN A.AcousticWave Propagation in Saturated PorousMedia:Reformulation of the Biot/SquitFlow Theory[J].Journal of AppliedGeophysics,2000,44:313.
[4]杨顶辉,张中杰.Biot和喷射流动耦合作用对各向异性弹性波的影响[J].科学通报,2000,45:1333.
[2]DVORKIN J,NUR A.Dynamic poroelasticity:A unified model with the squirtand the Boit mechanisms[J].Geophysics,1993,58(4):524.
[3]MAMADOU S D,ERUWIN A.AcousticWave Propagation in Saturated PorousMedia:Reformulation of the Biot/SquitFlow Theory[J].Journal of AppliedGeophysics,2000,44:313.
[4]杨顶辉,张中杰.Biot和喷射流动耦合作用对各向异性弹性波的影响[J].科学通报,2000,45:1333.
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