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现有的孔隙介质震电理论缺乏针对含油储层震电耦合的数学模型及定量模拟,制约了该方法在含油储层中的推广应用.本文将非饱和孔隙介质中弹性波动理论与含油储层中动电耦合理论及麦克斯韦电磁理论相结合,建立了描述油水两相饱和储层中震电耦合波的数学方法,定量模拟了含油储层中平面震电波场响应特性,并探讨了储层参数对震电波场响应的影响.研究结果表明:油水两相饱和储层中震电耦合产生四种震电耦合波,震电横波、震电纵波P1、P2和P3波;震电波场响应具有频散特性,频率增大,震电纵波P2和P3波传播速度显著增大,震电波衰减常数均增大;相同频率下,震电纵波P2波电场强度及电流密度与固相速度比值的模值相比其它三种震电波的均较大,说明其激发电场和电流能力较强;震电波场响应受到宏观储渗参数的影响,储层孔隙度增大,震电波的传播速度均减小,三种震电纵波的衰减常数均增大,且震电横波和震电纵波P1波的电场强度与固相速度比值的模值均增大,震电纵波P2和P3波的均减小;储层渗透率增大,震电波的传播速度均增大,震电横波的衰减常数、电场强度与固相速度比值的模值亦增大,而三种震电纵波的则相反;含水饱和度增大,震电横波、震电纵波P1(低频时)和P2波的传播速度均减小,衰减常数、电场强度及电流密度与固相速度比值的模值均增大,震电纵波P3波的则相反;震电波响应电场强度及电流密度与固相速度比值的相位在高频时出现频散现象,同样受到储层参数的影响.
The existing theory of poroelastic shock is lack of mathematical model and quantitative simulation for the seismic coupling of oil-bearing reservoirs, which restricts the popularization and application of this method in oil-bearing reservoirs.In this paper, the elastic wave theory in unsaturated porous media is compared with oil- In this paper, a mathematical method to describe the coupled wave in the oil-water two-phase saturated reservoir is established by combining the theory of meso-electric coupling and the Maxwell electromagnetic theory. The response characteristics of the plane seismic wave field in the oil-bearing reservoir are quantitatively simulated, and the reservoir parameters The results show that there are four types of coupled wave, electropotential shear wave and electropower P-wave P-wave, P-wave and P-wave in the oil-water two-phase saturated reservoir. Dispersion characteristic and frequency increase, the propagation velocity of the P-wave and P-wave of the P-wave show a significant increase and the attenuation constant of the E-wave increases. Under the same frequency, the P-wave electric field intensity and the ratio of the current density to the solid- Compared with other three kinds of seismic waves, it shows that the excitation electric field and current capability are strong. The response of the seismic wave field is affected by the macroscopic reservoir and permeability parameters. The porosity of the reservoir increases and the propagation speed of the seismic wave decreases , The attenuation constants of the three kinds of seismic waves are all increased, and the values of the electric field intensity and the solid-phase velocity ratio of the P- and P- The reservoir permeability increases, the propagation speed of seismic waves increases, the attenuation constant of electric shear waves, the modulus of electric field strength and solid-state velocity ratio also increase, while the three kinds of seismic waves show the opposite; the water saturation The propagation velocity of the S-wave, the S-wave, and the P-wave of the P-wave (both in the low frequency) and the P2 wave decrease, the attenuation constants, the electric field strength and the ratio of the current density to the solid- On the contrary, the dispersion of the electric field intensity and the ratio of the current density to the solid-phase velocity ratio occurs at high frequency, which is also affected by the reservoir parameters.