储层砂岩纵波衰减的实验结果分析

Experimental analysis of P-wave attenuation in sandstone of reservoir with ultrasonic frequency

(1.成都理工大学信息工程学院，四川成都610059；2.中国石油大学CNPC物探重点实验室，北京102249)

College of Information Engineering, Chengdu University of Technology, Chengdu 610059, China

在超声波频率下，利用脉冲透射法，探讨了实验室条件下流体饱和岩石的频散和衰减机制，对不同围限压力下的干燥和不同粘度流体饱和砂岩样品的衰减特征进行了系统的研究。给出了岩石样品衰减的测量方法，分别对干燥样品和流体饱和样品进行了频谱分析，对衰减机制进行了讨论。利用Biot流模型和BISQ模型分析了流体饱和岩石中与流体流动作用有关的衰减。定量分析了各种衰减机制对弹性波总衰减的相对贡献。讨论了将实验结果引入地震勘探时，与流体流动相关的各种衰减机制的适用性。

By using ultrasonic frequency, pulse transmission technique was used to probe the dispersion and attenuation mechanism of fluid-saturated rock in laboratory. The attenuation characteristics of dry and different fluid-saturated sandstone samples under different confining pressure were studied. The method of measuring the attenuation of rock samples was introduced. Spectrum was analyzed on dry samples and fluid-saturated samples, and the attenuation mechanism discussed. Biot-flow model and BISQ model were sed to analyze the attenuation related to the fluid flowing in fluid-saturated rock. The relative contribution of the attenuation mechanisms to the overall attenuation of elastic wave was quantitatively analyzed. The applicability of the attenuation mechanisms related to fluid flowing was discussed under the condition of introducing experimental results into practical seismic exploration.