低孔低渗岩石声学参数的实验研究

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。

AN EXPERIMENTAL STUDY ON ACOUSTIC PARAMETERS OF LOW POROUS AND PERMEABLE ROCK

This paper performs an acoustic parameters testing of 20 pieces of low porous and permeable rock sample of Well Fangshen 8 in Daqing Oil Field under the condition of fully saturated water and gas. The result includes not only the longtitude and transversal waves of rock sample containing gas and water, but also the wave train. A wave spectrum analysis on frequency domain indicates that, except distinguishing rock containing saturated gas and water according to the velosity ratio of longtitude and transversal waves, the dominant frequency shifts on the frequency domain wave spectrum because of different attenuation of the rock via longtitude and transverse waves. The dominant frequency shift of inequitable sandstone sample is apparent. Therefore dominant frequency shift of rock is possible to become a new characteristic parameter for identifying reservoirs containing gas and water.