Patent ID: 11892588
Assignee: INSTITUTE OF GEOLOGY AND GEOPHYSICS, CHINESE ACADEMY OF SCIENCES
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 4:
5. A system for transient electromagnetic-induced polarization field separation and multi-parameter information extraction, comprising a data obtaining module, a field separation module and a parameter inversion module;
wherein the data obtaining module is used for obtaining electromagnetic data influenced by an induced polarization effect, and the electromagnetic data influenced by the induced polarization effect is induced polarization-electromagnetic field data;
the field separation module is used for separating an induced polarization field and an electromagnetic field from the electromagnetic data influenced by the induced polarization effect, to obtain a pure electromagnetic response field and a pure induced polarization response field;
the parameter inversion module is used for respectively performing a multi-parameter information inversion based on the pure electromagnetic response field and the pure induced polarization response field to extract geoelectric parameters, wherein the geoelectric parameters comprise a predicted layer thickness, a predicted resistivity and a predicted polarizability;
wherein the field separation module comprises a first convolutional neural network unit and a separation unit;
the first convolutional neural network unit is used for separating from the induced polarization-electromagnetic field data and obtaining the pure electromagnetic response field; specifically, recording the induced polarization-electromagnetic field data as EMIP, and recording the pure electromagnetic response field and the pure induced polarization response field as EM and IP respectively; according to an electromagnetic induction principle and the induced polarization effect, obtaining:

EMIP=EM+IP   1

due to different geoelectric models, the EMIP, the EM and the IP are all different, so mappings between the EMIP and the EM, or between the EMIP and the IP are nonlinear, and two kinds of the mappings are recorded as F1 (x) and F2 (x) respectively, satisfying:

EM=F1(EMIP)   2

IP=F2(EMIP)   3

selecting the mapping F1 (x) as a mapping to be learned, obtaining the EM from the EMIP by formula 2, and then obtaining the IP by formula 1, and realizing a field separation, that is, the pure electromagnetic response field recorded as ,

=Net1(w,EMIP)   4

wherein w is a parameter matrix to be learned;
the separation unit is used for subtracting the pure electromagnetic response field from the induced polarization-electromagnetic field data to obtain the pure induced polarization response field; specifically, the predicted induced polarization field, that is, the pure induced polarization response field, is obtained by using the formula 1 and recorded as ,

=EMIP−=EMIP−Net1(w,EMIP)   5