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A Permeability Estimation Method Based on Spontaneous Potential Inversion

A self-potential and permeability technology, which is used in electric/magnetic exploration, water resource assessment, and re-radiation of sound waves, etc., can solve problems such as the inability to obtain the relationship between the observation signal and the position of the underground fluid, and the method discussion only stays, etc. Achieve the effect of improving computational efficiency, reducing quantitative errors, and improving accuracy

Active Publication Date: 2022-07-08
JILIN UNIV
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Problems solved by technology

However, in the early stage of the research of this type of method, people could not obtain the mutual response relationship between the observation signal and the position of the subsurface fluid, and the discussion of the method only stayed in the aspect of qualitative explanation

Method used

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  • A Permeability Estimation Method Based on Spontaneous Potential Inversion
  • A Permeability Estimation Method Based on Spontaneous Potential Inversion
  • A Permeability Estimation Method Based on Spontaneous Potential Inversion

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Experimental program
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Effect test

Embodiment

[0153] like figure 1 As shown, a method for estimating underground permeability based on self-potential signal inversion includes the following steps:

[0154] (S1) Simulate the forward and inversion response of the underground spontaneous potential signal by establishing a hydraulic and electrical coupling model:

[0155] The response of the natural potential signal in the underground space to the groundwater flow is simulated by establishing a forward model of hydraulic and electrical transmission, and then the underground potential distribution field is obtained by solving and calculating the least squares inversion problem.

[0156] (S2) Calculate the sedimentary coupling coefficient and estimate the underground permeability distribution information:

[0157] Firstly, the water conservancy and electrical problems are solved by establishing a model, and the natural potential distribution is obtained after setting each boundary condition. Under the condition that there is ...

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Abstract

The invention belongs to the technical fields of geothermal, geophysical electrical exploration and engineering and environmental geophysics research, and relates to a permeability estimation method based on natural potential signal inversion. Including: S1 obtains the underground current density distribution by establishing the hydraulic and electrical coupling model to simulate the forward and inversion response of the underground natural potential signal, uses the collected conductivity constraints to restore the underground potential field, and obtains the permeability distribution according to the potential field; The high-density resistivity data obtained in the field is inverted and processed to obtain the conductivity distribution, combined with the self-potential signal for forward and inversion calculation to restore the underground natural potential field, and estimate the underground permeability distribution information. Compared with the traditional intrusive method, the non-destructive detection technology is used to observe the multi-dimensional (time-space) multi-response parameter information of groundwater in the effective geothermal target area. Coupling multiple electrical parameters to calculate and restore the distribution of permeability, skip the steps of difficult sampling and difficult measurement in traditional problems.

Description

technical field [0001] The invention belongs to the technical fields of geothermal, geophysical electrical exploration and engineering and environmental geophysics research, and relates to a permeability estimation method based on natural potential signal inversion. Background technique [0002] In recent years, the detection and utilization of underground thermal energy is a new technological field of continuous development. The acquisition of information on the flow direction and migration path of subsurface thermal fluids through conventional geophysical exploration is the focus of attention. [0003] Traditional geophysical methods are not sensitive enough to groundwater flow information and cannot detect small changes in seepage. Compared with the resistivity method, which is one of the methods for observing changes in water flow, the geoelectric structure can be obtained relatively accurately. Among them, the natural potential method in electrical exploration is an ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
CPCG01V3/38Y02A90/30
Inventor 白利舸李静曾昭发谭家炜刘辉王天琪宋文鹏
Owner JILIN UNIV
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