论文部分内容阅读
对大庆油田芳深８ 井２０ 块低孔、低渗岩样， 在完全饱和水和气的条件下进行声学参数测试。除得到岩样在含气和含水时纵、横波速度及幅度外， 还记录了波列， 并在频域上进行波谱分析，发现除了可根据纵横波速度比区分饱气和饱水岩石外， 饱气和饱水岩样由于对纵波、横波的衰减不同， 在频域波谱上出现了不同的主频漂移， 其中不等粒砂岩岩样的主频漂移明显。因此岩石的主频漂移可望成为识别储层中含气和含水的新的特征参数。
Twenty low porosity and low permeability rock samples from Fangshen 8 well in Daqing oilfield were tested for acoustic parameters under fully saturated water and gas conditions. In addition to the velocities and amplitudes of longitudinal and shear waves of gas-bearing and water-bearing rocks, wave trains were recorded and analyzed in the frequency domain. It was found that in addition to distinguishing between saturated and saturated rocks based on P-wave velocity ratios, Due to the different attenuation of longitudinal wave and transverse wave, different frequency shifts occur in the frequency-domain spectra of gas-saturated and water-saturated rock samples, in which the dominant frequency drift of the unequal sandstone samples is obvious. Therefore, the frequency drift of rock is expected to become a new characteristic parameter to identify gas and water in reservoirs.