跨频段岩石波速及频散的实验研究  

Experimental study on cross-frequency wave velocity and dispersion in rocks

作　　者：李民龙 刘浩杰[1] 杨宏伟[1] 魏国华[1] 石建新[1] LI Minlong;LIU Haojie;YANG Hongwei;WEI Guohua;SHI Jianxin(Shengli Geophysical Research Institute of Sinopec,Dongying,Shandong 257022,China)

机构地区：[1]中国石化胜利油田物探研究院,山东东营257022

出　　处：《石油地球物理勘探》2020年第2期373-378,I0005,共7页Oil Geophysical Prospecting

基　　金：中国石油化工股份有限公司科技攻关项目“跨频段岩石物理实验分析及储层流体检测”(P16032)资助。

摘　　要：基于实验室高、低频联合测试技术,针对A、B岩心样品开展了不同频段(2~2000Hz、1MHz)、饱含不同流体(水、甘油)条件下实验室弹性参数测试。实验结果表明:孔隙流体流动性越强,频散特征频率越高;频散特征频率与孔隙度、渗透率呈正相关,与流体黏度呈负相关;高频段纵波速度随饱和度增加而增加;低频段纵波速度随饱和度增加先减后增,存在一个临界饱和度,该临界饱和度的大小与孔隙流体的流动性密切相关。We measure the elastic properties of two samples,A and B,saturated with different fluids(water and glycerol)at different frequencies(2~2000 Hz and 1 MHz).The results show that the frequency of dispersion increases with pore fluid mobility.The frequency of dispersion is positively correlated with porosity and permeability and negatively correlated with fluid viscosity.P-velocity increases with saturation at high frequencies;P-velocity first increases and then decreases with saturation at low frequencies.This means there is a critical saturation,the value of which is closely related to fluid mobility.

关 键 词：频散 特征频率 临界饱和度 流体流动性 黏度 

分 类 号：P631[天文地球—地质矿产勘探]