摘要
本文针对流体饱和孔隙介质的动电效应,在砂岩模型井中开展了动电测井实验研究.记录到渗透率不同模型中单极源动电测井的全波波形,清晰地观测到了伴随纵波、横波和斯通利波的动电转换信号,给出了本文实验条件下,动电测井全波中各分波的幅度,并通过电声比的大小说明了各分波的动电转换能力.实验结果表明:孔隙介质动电效应与渗透率密切相关,动电信号的幅度随着地层渗透率的增大而增加,在高渗透率地层中记录动电信号的幅度较大,这一特性可用于地层渗透率的井下动电评估.本文实验结果还验证了动电测井的可行性,同时指出:与声波测井相比,动电测井信号对地层渗透率更加敏感,这为渗透率等地层参数的井下动电测量奠定了实验基础.
In this paper,an experimental system is built based on the electrokinetic theory in the lab,then the electrokinetic experiments are carried out in two sandstone models with seismoelectric well logging technique.The two boreholes have different parameters,such as formation wave velocity,permeability and so on.The localized electric fields that accompany compressional wave,shear wave and stoneley wave are observed and recorded in these two models with the monopole source.The amplitude of each wave is given in our experimental conditions and stored by the data acquisition card.The electrokinetic coupling ability of these waves is also analyzed from the ratio of the electrokinetic signal to wave pressure.The experimental results show that the electrokinetic effect is closely related to the permeability of porous medium,and the amplitude of electrokinetic signal is proportional to the formation permeability,it becomes larger in the higher permeability model,which can be used to measure formation permeability in the field exploration.This work verifies the feasibility of seismoelectric well logging,and alsopoints out that seismoelectric logging signals are more sensitive to the formation permeability compared with the signals obtained from acoustic logging.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第10期3855-3863,共9页
Chinese Journal of Geophysics
基金
国家自然科学基金(41304091
11372091
41204092)
国家54批博士后基金(2013M541357)
黑龙江省留学归国科学基金(LC201420)
中央高校基本科研业务费专项资金(HIT.NSRIF.2014028)资助
关键词
动电效应
测井
渗透率
Electrokinetic effect
Well logging
Permeability
