Experimental Study On The Influence Of Sandstone Layer Thickness And Fluid On Seismoelectric Effect

The seismoelectric effect refers to the excitation of the seismic wave causing the disturbance of the electric double layer in the medium when passing through the underground fluid-containing porous medium,so that the mutual conversion and coupling of mechanical energy and electrical energy occur,which are mainly affected by the physical property parameters of the medium and the properties of the formation interface.The seismoelectric effect can be used as a supplement to conventional seismic exploration and has broad application prospects.Through a series of experiments,this paper builds a set of seismoelectric measurement system,which improves the stability of measurement,and expounds the measurement methods and factors affecting measurement from the experimental point of view.The response of the seismoelectric effect at the interface reflects the related properties of the medium.This paper discusses the influence of sandstone layer thickness and layer number on the seismoelectric effect by constructing a multi-layer sandstone model.The experimental results show that the thin layer can enhance the seismoelectric effect.Seismoelectric signal can also resolve multi-layer models.The seismoelectric effect is very sensitive to the properties of the fluid.This paper analyzes the effects of saturated water,saturated brine and saturated oil on the seismoelectric effect.The experimental results show that the seismic effect is affected by the fluid properties and saturation,and the seismoelectric signal is the most obvious and stable at full saturation.The experiment of the oil-water interface model shows that the seismoelectric signal can be used to monitor the change of the oil-water interface.