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Physical modeling and Ultrasonic experiment of pore-crack in reservoirs

CAO Jun,HE Zhen-hua,HUANG De-ji,LI Qiong gdu University of Technology, Chengdu 610059,China)  
According to physical modeling similarity, different models simulating pore and crack in reservoirs were made. Seismic responses to these artifical physical models of pore\|crack in reservoirs had been observed by ultrasonic experiment using MTS (a rock Mechanics Test System). We analyse the influences of pore\|crack porosity on seismic wave attributes. Summarize according to ultrasonic experiment results: the change of pore\|crack porosity evidently influences the characteristic parameters of seismic wave, such as velocity, amplitude, main frequency and the quality factor etc. even more, we contrast and analyze the degree of influences on each parameters. Along with increase of pore\|crack porosity, 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. Decrease of amplitude, main frequency and the quality factor of seismic wave is high one to three quantitative grade than velocity. Therefore, it offers reliable experiment foundation for detecting and predicting crack and pore in reservoirs by the characteristic parameters of seismic wave in reason.
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