Study On Geo-electric Field Response Of Transportation In Porous Media

In this Thesis,the combined physical model with different pore structure media is constructed.The experiment on seepage in porous media is carried out by using different viscous fluids with groundwater and chemical slurry.In these experiments,the changes in physical parameters: spontaneous potential,exciting current,primary field and apparent resistivity is monitored to study the seepage process of groundwater and chemical slurry in the porous media.Studying the correlation between the temporal and spatial changes of seepage diffusion and related physical parameters provides a basis for the physica l detection of fluid pore seepage.The experimental study has achieved the following findings:(1)The comparative test results of different pore water states: The response degree of physical characteristics of pore permeability depends mainly on the filling degree of pore space,under the condition of water saturation in pore media,The variation of spontaneous potential,exciting current and apparent resistivity along with the seepage path of groundwater and chemical slurry is relatively weak;While for the unsaturated state of the Permeable body,during the process of fluid infiltration,the spontaneous potential,exciting current,primary field and the apparent resistivity of the Pore Permeable body show obvious changes with the seepage diffusion,The spontaneous potential,exciting current increase with the flow of fluid and as the primary field,apparent resistivity decreases.Among them,the changes of spontaneous expresses slow and small response,the exciting current,primary field and apparent resistivity response are intense,and the variation range is larger.(2)The spatiotemporal characteristics of the spontaneous potential,exciting current and apparent resistivity response of the chemical slurry are consistent with that of the groundwater seepage process,indicating that the physical response mechanism of pore seepage is less affected by the physical and chemical properties of the fluid.(3)There is a significance difference in the physical properties of the chemical slurry before and after curing in the permeate,the apparent resistivity in seepage path of pre-curing chemical slurry reduces significantly,however the same location appears high apparent resistivity state while chemical slurry is curing,that means the solid chemical slurry shows a higher apparent resistivity,reflecting the physical response of the slurry consolidation state.(4)Compared with the non-pressure permeation,the physical response of groundwater and chemical slurry in the porous media is relatively obvious.It is believed that this result reflects the effect of seepage pressure on the structure of permeate can be expressed by the physical response to some extent.