US 12,529,818 B2Granted

Randomly distributed tensor resistivity measurement method and system

AssigneeZhejiang University

InventorsJiaxin Wang, Bangbing Wang

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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.

Claims10

Dependent claims

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 M1, N1, M2, and N2 around each potential measurement station P, wherein each potential measurement station P is equipped with a potential measurement unit, and a line connecting M1 and N1 intersects with a line connecting M2 and N2;
a distance between M1-N1 and a distance between M2-N2 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 A1, B1, A2, and B2, and ensuring that the line between A1-B1 intersects with the line between A2-B2;
S4:
supplying power to electrodes at A1 and B1 using a supply station, while all electrodes at potential measurement stations P simultaneously performing potential measurement;
the supply station recording a supply current I1 of electrodes at A1 and B1, and each potential station measuring the potential differences
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M
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1
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1
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and
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Δ
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M
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2
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2
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across electrode pairs M1-N1 and M2-N2, respectively, corresponding to current injection at A1 and B1;
subsequently, supplying power to electrodes at A2 and B2, while all electrodes at potential measurement stations P simultaneously perform potential measurement;
the supply station recording a supply current I2 of electrodes at A2 and B2, and each potential station measuring the potential differences
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M
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and
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2
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2
(
2
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across electrode pairs M1-N1 and M2-N2, respectively, corresponding to current injection at A2 and B2;
S5:
based on the supply currents I1 and I2, and the spatial relationships between A1, B1, and point P, obtaining a first current density vector generated by A1 and B1 at P and a second current density vector generated by A2 and B2 at P;
using
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M
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1
(
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and
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2
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2
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along with the electrode spacing to derive the first electric field intensity vector generated by A1 and B1 at point P;
using
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M
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(
2
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and
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2
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(
2
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along with the electrode spacing to derive the second electric field intensity vector generated by A2 and B2 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.

136 more elements

A randomly distributed tensor resistivity measurement system, comprising a plurality of current supply stations and potential measurement stations;

wherein each current supply station comprises a supply station host, long-distance power cables, current injection electrodes, and a boost power supply;
the supply station host comprises a first control module, first power module, first built-in battery, current measurement module, and first GPS module;
the first control module is configured to control electrode channel selection, power parameter configuration, external power supply integration, internal power management, current measurement, GPS timing, and synchronization of current data into a time series stored at preset intervals;
the current measurement module is configured to digitize the current values through an A/D converter;
the first power module is configured to select specific supply channels and connects to the boost power supply;
the first built-in battery is configured to supply long-term operating power;
the first GPS module, with an external antenna, is configured to provide location and time data to the host;
the host is configured to provide four power output ports connected via long-distance cables to current electrodes at points A1, B1, A2, and B2 for sequential power delivery underground;
each potential measurement station comprises a station host, potential measurement cables, and electrodes;
the host comprises a second control module, second power module, second built-in battery, potential measurement module, and second GPS module;
the second control module is configured to control channel selection, measurement settings, power management, dual-channel acquisition, and GPS-synchronized time-stamped data storage;
the potential measurement module is configured to acquire differential voltage from two orthogonal channels simultaneously;
the second power module is configured to manage the internal battery condition and charging;
the second built-in battery is configured to ensure long-term operation and essential standby functions;
the second GPS module, with an external antenna, is configured to provide location and clock data to the host;
the host comprises four measurement ports connected via cables to electrodes at M1, N1, M2, and N2 to receive potential difference signals between electrode pairs.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/220,004Filed 27 May 2025
Priority: CN 202410670742.928 May 2024
Published: US 2025/0370156 A14 Dec 2025
Granted: 20 Jan 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

G01V 3/04
Operating with propagation of electric current: using DC
G01R 29/12
Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00: measuring electrostatic fields or…
G01V 3/02
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation: operating with…
G01V 3/088
Operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices: operating with…