US 2026/0086260 A1Published application

Electrical source transient electromagnetic data imaging method, device and system thereof and storage medium

AssigneeInstitute of Geology and Geophysics, Chinese Academy of Sciences

InventorsWeiying CHEN, Guoqiang XUE, Yulian ZHU, Pengfei LYU

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Abstract

An electrical source transient electromagnetic data imaging method, a device and a system thereof and a storage medium are provided. The method includes following steps: step S1, observing horizontal electric field ex and vertical induced voltage vz at a same measuring point; step S2, respectively obtaining first derivatives of time t for the horizontal electric field ex and the vertical induced voltage vz; step S3, calculating full-period apparent resistivity according to the first derivatives; and step S4, performing time-depth conversion according to the full-period apparent resistivity to realize apparent resistivity depth imaging.

Claims5

Dependent claims

An electrical source transient electromagnetic data imaging method, comprising:

step S1, observing horizontal electric field ex and vertical induced voltage vz at a same measuring point;
step S2, respectively obtaining first derivatives of time t for the horizontal electric field ex and the vertical induced voltage vz,
step S3, calculating full-period apparent resistivity according to the first derivatives;
and
step S4, performing time-depth conversion according to the full-period apparent resistivity to realize apparent resistivity depth imaging;
wherein in the step S2, expressions of the horizontal electric field ex and the vertical induced voltage vz are:
e
?
=
-
Ids
π
3
/
2
·
ρ
r
3
·
[
∫
?
?
e
?
⁢
d
?
-
ue
?
]
v
?
=
-
?
ds
π
3
/
2
⁢
μ
?
·
y
⁢
ρ
r
?
·
[
3
⁢
∫
?
?
e
?
⁢
d
?
-
u
⁡
(
3
+
2
⁢
u
?
)
⁢
e
?
]
,
?
indicates text missing or illegible when filed
wherein I is emission current intensity, ds is a length of a dipole source, ρ is resistivity, r=√{square root over ((x−x′)2+(y−y′)2)} is a distance from an observation point (x, y) to an emission source (x′, y′), and a variable
u
=
1
2
⁢
μ
?
ρ
?
⁢
r
,
?
indicates text missing or illegible when filed
μ0=4×10−7 H/A is magnetic permeability;
and
the first derivatives of the time t are respectively obtained for the horizontal electric field ex and the vertical induced voltage vz:
e
?
?
=
∂
e
?
∂
t
=
Ids
π
3
/
2
·
ρ
r
3
·
1
t
·
u
?
·
e
?
v
?
z
=
∂
v
?
∂
=
-
Ids
π
3
/
2
⁢
μ
0
·
y
⁢
ρ
r
5
·
2
⁢
u
?
·
e
?
·
1
?
,
?
indicates text missing or illegible when filed
wherein ėx is the first derivative of the time t for the horizontal electric field ex, and {dot over (v)}z is the first derivative of the time t for the vertical induced voltage vz.

164 more elements

An electrical source transient electromagnetic data imaging device, comprising:

an acquisition module used for observing horizontal electric field ex and vertical induced voltage vz at a same measuring point;
a first calculation module used for respectively obtaining first derivatives of time t for the horizontal electric field ex and the vertical induced voltage vz;
a second calculation module used for calculating full-period apparent resistivity according to the first derivatives;
and
a third calculation module used for performing time-depth conversion according to the full-period apparent resistivity to realize apparent resistivity depth imaging;
wherein expressions of the horizontal electric field ex and the vertical induced voltage vz are:
e
?
=
-
Ids
π
3
/
2
·
ρ
r
3
·
[
∫
?
?
e
?
⁢
d
?
-
ue
?
]
v
?
=
-
?
ds
π
3
/
2
⁢
μ
?
·
y
⁢
ρ
r
?
·
[
3
⁢
∫
?
?
e
?
⁢
d
?
-
u
⁡
(
3
+
2
⁢
u
?
)
⁢
e
?
]
,
?
indicates text missing or illegible when filed
wherein I is emission current intensity, ds is a length of a dipole source, ρ is resistivity, r=√{square root over ((x−x′)2+(y−y′)2)} is a distance from an observation point (x, y) to an emission source (x′, y′), and a variable
?
=
1
2
⁢
μ
?
ρ
?
?
,
?
indicates text missing or illegible when filed
μ0=4×10−7 H/A is magnetic permeability;
and
the first derivatives of the time t are respectively obtained for the horizontal electric field ex and the vertical induced voltage vz:
e
?
?
=
∂
e
?
∂
?
=
Ids
π
3
/
2
·
ρ
r
3
·
1
t
·
u
?
·
e
?
v
?
z
=
∂
v
?
∂
?
=
-
Ids
π
3
/
2
⁢
μ
0
·
y
⁢
ρ
r
5
·
2
⁢
u
?
·
e
?
·
1
?
,
?
indicates text missing or illegible when filed
wherein ėx is the first derivative of the time t for the horizontal electric field ex, and {dot over (v)}z is the first derivative of the time t for the vertical induced voltage vz.

164 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/266,349Filed 11 Jul 2025
Priority: CN 202411314431.520 Sep 2024
Published: 26 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01V 3/12
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation: operating with…
G01V 3/38
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation: processing…
G01V 20/00
Geomodelling in general
Y02A 90/30
Technologies having an indirect contribution to adaptation to climate change: assessment of water resources

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