Physical Model Experiment Research Of Crack Reservoir

This paper is taking model seismology theory as guidance,regards Ultrasonic experimental method as major research means,and has made artificial crack and pore model according to physical model similar principle with various materials. First,using artificial crack model,the influences of crack density,azimuth and opening on the characteristic parameters of seismic wave have been studied. Summarize according to experiment results:(1)Shear-wave splitting can detect the degree of crack density. (2)The main frequency,attenuation and amplitude of seismic wave can detect change of crack opening. (3)We can detection the azimuth of crack growth by abnormal amplitude or the discrepancy of wave-speed. (4)We can guess whether crack contains fluids by the change of P-wave speed. Second,using pore model,under press and temperature,we have studied the influences of pore density on the characteristic parameters of seismic wave. The analysis of experiment results:(1)The more little pore density,the more strong the responds of seismic wave. Along with increase of pore density,the characteristic parameters of seismic wave,such as velocity,amplitude,main frequency and the quality factor of seismic wave etc,gradually decrease. But,the change of each parameter has obvious discrepancy and has a threshold value of pore density. When exceeding this value,seismic wave is weak to be hard to distinguish. For different material,press and temperature,the threshold value is also different. (2)Pressure and temperature influence the characteristic parameters of seismic wave for pore model also,but the influence of pressure is more notable than temperature. Along with increase of pressure,the parameters such as velocity,amplitude,main frequency and quality factor of seismic wave change big gradually,while change very weakly with the change of temperature. Through testing research for artificial crack and pore model,we conclude that crack density,azimuth,opening and the change of pore have obvious influences on speed,amplitude,attenuation (or quality factor) and main frequency of seismic wave etc. But,seismic wave dynamic characteristics are more evident than its kinematical characteristics for the change of crack and pore parameters. Therefore,it offers reliable experiment foundation for detecting crack and pore by seismic wave kinematical characteristics (such as amplitude,attenuation and main frequency etc.)...