Randomly distributed tensor resistivity measurement method and system

Patent metadata

Field	Value
Publication number	US-12529818-B2
Application number	US-202519220004-A
Country	US
Kind code	B2
Filing date	May 27, 2025
Priority date	May 28, 2024
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

Disclosed is a randomly distributed tensor resistivity measurement method and system. In the method, electrode deployment can be randomly arranged based on site-specific grounding conditions. The current supply station sequentially energizes two orthogonal current injection channels, while all potential measurement stations simultaneously and in parallel acquire potential differences across two measurement channels. The current and potential difference data are recorded with GPS timestamps, enabling synchronization of current supply and potential measurement station data based on corresponding time. Using the recorded data, current density vectors and electric field intensity vectors are calculated for each supply-measurement station combination, from which the corresponding apparent resistivity tensor is derived.

First claim

What is claimed is:

1 . A randomly distributed tensor resistivity measurement method, comprising the following steps:
S1: randomly arranging a plurality of potential measurement stations P across a survey area according to surface conditions to cover the entire survey area; S2: arranging four potential electrodes M 1 , N 1 , M 2 , and N 2 around each potential measurement station P, wherein each potential measurement station P is equipped with a potential measurement unit, and a line connecting M 1 and N 1 intersects with a line connecting M 2 and N 2 ; a distance between M 1 -N 1 and a distance between M 2 -N 2 are defined as electrode spacing a, where a=( 1/10- 1/20) H, and H represents the exploration depth; S3: deploying a plurality of current injection points within the survey area; selecting any four of the plurality of current injection points as A 1 , B 1 , A 2 , and B 2 , and ensuring that the line between A 1 -B 1 intersects with the line between A 2 -B 2 ; S4: supplying power to electrodes at A 1 and B 1 using a supply station, while all electrodes at potential measurement stations P simultaneously performing potential measurement; the supply station recording a supply current I 1 of electrodes at A 1 and B 1 , and each potential station measuring the potential differences

Δ
⁢

U

M
⁢
1
⁢
N
⁢
1

(
1
)

⁢

and
⁢

Δ
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U

M
⁢
2
⁢
N
⁢
2

(
1
)

 across electrode pairs M 1 -N 1 and M 2 -N 2 , respectively, corresponding to current injection at A 1 and B 1 ; subsequently, supplying power to electrodes at A 2 and B 2 , while all electrodes at potential measurement stations P simultaneously perform potential measurement; the supply station recording a supply current I 2 of electrodes at A 2 and B 2 , and each potential station measuring the potential differences

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U

M
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1
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N
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1

(
2
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and
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Δ
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M
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2
⁢
N
⁢
2

(
2
)

 across electrode pairs M 1 -N 1 and M 2 -N 2 , respectively, corresponding to current injection at A 2 and B 2 ;
S5: based on the supply currents I 1 and I 2 , and the spatial relationships between A 1 , B 1 , and point P, obtaining a first current density vector generated by A 1 and B 1 at P and a second current density vector generated by A 2 and B 2 at P; using

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M
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1
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N
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1

(
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and
⁢

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M
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2
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N
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2

(
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 along with the electrode spacing to derive the first electric field intensity vector generated by A 1 and B 1 at point P; using

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M
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1
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N
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1

(
2
)

⁢

and
⁢

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M
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2
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N
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2

(
2
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 along with the electrode spacing to derive the second electric field intensity vector generated by A 2 and B 2 at point P;
S6: performing vector decomposition of the first current density, the second current density, the first electric field vector, and the second electric field vector in a common coordinate system to compute the apparent resistivity tensor.

2 . The method of claim 1 , wherein the survey area is first divided into multiple sub-areas before executing step S1, and steps S1-S6 are performed within each sub-area to complete the tensor resistivity measurement across the entire survey area.

3 . The method of claim 1 , wherein prior to step S1, dividing the survey area into multiple sub-areas; executing steps S1-S2 in each sub-area to arrange potential measurement stations P and potential measurement electrodes M 1 , N 1 , M 2 , N 2 ;
wherein the power supply arrangement and selection in step S3 are replaced by: arranging k internal current injection points in each sub-area, and l external current injection points around the perimeter; one of the k internal points is selected as point O, and two of the l external points are selected as A 1 and A 2 , respectively; both B 1 and B 2 are coincided with point O; executing steps S4-S6 within each sub-area to complete the apparent resistivity tensor.

4 . The method of claim 1 , wherein prior to step S1, dividing the survey area into multiple sub-areas; executing steps S1-S2 to deploy potential measurement stations and electrodes in each sub-area;
wherein the power supply arrangement and selection in step S3 are replaced by: deploying not fewer than four external injection points around each sub-area; selecting four of the external injection points as A 1 , B 1 , A 2 , and B 2 , with a line between A 1 and B 1 intersecting w

Assignees

• Univ Zhejiang

Inventors

• Wang Jiaxin
• Wang Bangbing

Classifications

• G01V11/00

  Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00 · CPC title

• G01V3/38

  Processing data, e.g. for analysis, for interpretation, for correction · CPC title

• G01V3/36

  Recording data (G01V3/34 takes precedence) · CPC title

• G01V3/28

  using induction coils · CPC title

• G01V3/12

  operating with electromagnetic waves {(operating with millimetre waves G01V8/005)} · CPC title