One-dimensional joint inversion method for time-frequency electromagnetic data and magnetotelluric data

A kind of magnetotelluric, time-frequency electromagnetic technology, applied in the direction of electric/magnetic exploration, re-radiation of sound waves, geophysical measurement, etc., can solve the problems of no discovery, poor effect, and long calculation

Active Publication Date: 2015-01-14
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Before forming the objective function of the joint inversion of time-frequency electromagnetic and magnetotelluric data, it is necessary to calculate the Jacobian partial derivative matrix of the two methods. Using the traditional difference method will make the calculation longer and the effect is very poor.
How to solve these problems, no clues have been found in the published papers

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  • One-dimensional joint inversion method for time-frequency electromagnetic data and magnetotelluric data
  • One-dimensional joint inversion method for time-frequency electromagnetic data and magnetotelluric data
  • One-dimensional joint inversion method for time-frequency electromagnetic data and magnetotelluric data

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] 1) According to the frequency distribution range of the measured time-frequency electromagnetic and magnetotelluric data, select the data to participate in the joint inversion. Set initial layer thickness and resistivity values. The emission frequency range used by time-frequency electromagnetics is 0.1-100Hz, and the frequency range of magnetotelluric is 0.0005-0.1Hz. figure 1 It is the time-frequency electromagnetic amplitude curve of measuring point 1014 and the apparent resistivity curve of MT point MT1 obtained according to the above data selection standard, (top) TFEM, (bottom) MT. figure 2 It is the change diagram of the initial layer thickness with depth. The depth of 0-4400m on the ground is divided into 52 layers. The thickness of the layer increases gradually with the increase of the depth. The layer thickness is 20m, 40m, 50m, 100m and 200m. A h...

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Abstract

The invention discloses a one-dimensional joint inversion method for time-frequency electromagnetic data and magnetotelluric data. The transmitting frequency of the joint inversion time-frequency electromagnetism ranges from 0.025 Hz to 100 Hz, the frequency of the magnetotelluric sounding ranges from 0.0005 Hz to 320 Hz, the distances between all time-frequency electromagnetic measuring points and all magnetotelluric measuring points are calculated, the nearest magnetotelluric measuring point is obtained, data of the magnetotelluric measuring point are extracted, a joint inversion Jacobian partial derivative matrix of the time-frequency electromagnetism and the magnetotelluric sounding is calculated, a target function is calculated according to the regularization inversion principle, the target function is minimized through the conjugate gradient iterative algorithm, and when the fitting error of the target function reaches the set error standard or the iterations exceed the set maximum iteration number, the joint inversion is finished. According to the one-dimensional joint inversion method, the underground dielectric resistivity distribution below a measuring line can be obtained, the interpretation requirements for structures, faults and entrapments can be met, and the joint inversion result shows that the resolution from shallow to deep is higher than the resolution of the inversion result obtained by independently using time-frequency electromagnetic data.

Description

technical field [0001] The invention belongs to the field of electromagnetic prospecting data processing of geophysical prospecting, and relates to geophysical numerical simulation and inversion, in particular to a one-dimensional joint inversion method of time-frequency electromagnetic and magnetotelluric data. Background technique [0002] In the 1990s, the field sounding method was used for oil and gas reservoir detection and achieved good results. On the basis of this method, combined with the characteristics of time-domain transient electromagnetic sounding and frequency-domain electromagnetic sounding, a time-frequency electromagnetic method (He Zhanxiang., 2003, Artificial source time and frequency electromagnetic method: P.R. China patent application, ZL03150098 .6), this method has the characteristics of time domain electromagnetic method and frequency domain electromagnetic method. [0003] Time-frequency electromagnetic refers to the electromagnetic method that u...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
Inventor 王志刚万海珍
Owner BC P INC CHINA NAT PETROLEUM CORP
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