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

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

Active Publication Date: 2017-02-15
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Before forming the objective function of 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 time 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 and magnetotelluric data
  • One-dimensional joint inversion method for time-frequency electromagnetic and magnetotelluric data
  • One-dimensional joint inversion method for time-frequency electromagnetic and magnetotelluric data

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Embodiment Construction

[0037] The present invention will be described in detail below with reference to the 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 the initial layer thickness and resistivity value. The transmission frequency range used by time-frequency electromagnetic 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 No. 1014 measuring point and the apparent resistivity curve of MT point No. MT1 obtained after selecting the standard according to the above data, (top)TFEM, (bottom)MT. figure 2 It is a graph of initial layer thickness change with depth. The ground is divided into 52 layers at a depth of 0-4400m. The layer thickness gradually increases with the increase of depth. The layer thicknesses are 20m, 40m, 50m, 100m and 200m. A half-space model...

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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 electromagnetic exploration data processing field of geophysical exploration, and is a geophysical numerical simulation and inversion, specifically a one-dimensional joint inversion method of time-frequency electromagnetic and magnetotelluric data. Background technique [0002] The field sounding method was used in oil and gas reservoir exploration in the 1990s 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, time-frequency electromagnetic method (HeZhanxiang., 2003, Artificial source time and frequency electromagnetic method: PRChinapatent application, ZL03150098.6 ), this method has the characteristics of time domain electromagnetic method and frequency domain electromagnetic method. [0003] Time-frequency electromagnetics refers to the electromagnetic method that uses a large horizontal lon...

Claims

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Application Information

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Patent Type & Authority Patents(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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