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地震波场和电磁场耦合产生的震电效应与储层物性参数有关,含流体孔隙介质中震电效应的研究有助于更好的描述储层特性。本文我们对饱和砂岩样品中的震电效应进行了实验研究,构建了一套震电测量装置。利用此测量装置记录了在声波激励下砂岩样品中产生的震电转换信号,观测得到了砂岩界面产生的震电信号的衰减特性,在此基础上进一步研究了震电信号与砂岩物理参数之间的关系。在震电效应的实验中发现尽量减小参考电位与震电信号扰动区的基准电位之间的电位差是保证震电实验测量精确性的关键点,能够显著提高震电信号的可探测性。震电测量结果证实了地震波在含流体孔隙介质中传播时,能诱导震电耦合,同时给出了震电界面响应的特点。震电信号振幅随着波源与岩样距离的增加呈线性衰减,随着接收电极与岩样界面距离的增加呈指数衰减。不同渗透率砂岩样品中产生的震电响应结果表明震电响应的强弱与样品渗透率成正相关,震电效应可以作为研究储层渗透率的一种新方法。
The seismic effect caused by the coupling of seismic wave field and electromagnetic field is related to the physical property parameters of the reservoir. The study of the electroelastic effect in fluid-containing porous media is helpful to describe the reservoir characteristics better. In this paper, we conducted an experimental study on the seismic effect in saturated sandstone samples, and constructed a set of seismic measurement devices. Using this measuring device, the seismic signals generated in sandstone samples under acoustic excitation were recorded and the attenuation characteristics of the seismic signals generated at the sandstone interface were observed. Based on the results, the relationship between the seismic signals and the physical parameters of sandstone Relationship. It is found in the experiment of the seismic effect that minimizing the potential difference between the reference potential and the reference potential in the perturbation area of the seismic signal is the key point to ensure the accuracy of the experimental measurement of the earthquake and can significantly improve the detectability of the seismic signal. The results of electroelectroelectric measurements confirm that the seismic wave can induce the coupling of electrocomponents when it propagates in the fluid-containing porous medium, and at the same time, the characteristics of the response of the seismic interface are given. The amplitude of the seismoelectric signal decreases linearly with the increase of the distance between the source and the rock sample, exponentially decaying with the increase of the distance between the receiving electrode and the rock sample interface. The results of the electroelectrostatic response in the sandstone samples with different permeability show that the strength of the seismic response is positively correlated with the permeability of the sample, and the seismic effect can be used as a new method to study the permeability of the reservoir.