A Fast Statistical Inversion Method for Transient Electromagnetics
A transient electromagnetic and statistical technology, applied in design optimization/simulation, special data processing applications, etc., can solve problems such as slow calculation efficiency and difficulty in realizing engineering practicality, so as to improve engineering practicability and accelerate inversion convergence speed , to avoid the waste of computing resources
Active Publication Date: 2022-07-22
JILIN UNIV
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However, limited by the huge amount of calculation and the forward modeling speed of TEM itself, the calculation efficiency of this method is slow. Even if the conventional statistical inversion algorithm only performs the inversion of a single TEM data, it can be performed on an ordinary computer (such as computer configuration For Intel(R) Core(TM) I7-8700k, memory 32G), the calculation time usually takes more than 7 hours (1 million iterations), it is difficult to realize engineering practicality
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[0061] In order to understand the above objects, features and advantages of the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. But it should not be construed that the scope of the protection subject of the present invention is limited to the following examples, and all technologies realized based on the content of the present invention belong to the scope of the present invention. In order to avoid confusing the essence of the present invention, known methods, processes, Processes, components and circuits are not described in detail.
[0062] A transient electromagnetic fast statistical inversion method, characterized in that the method comprises the following steps:
[0063] Step S1: Collect transient electromagnetic data d in the exploration area obs， as input to the inversion model for fast statistical inversion;
[0064] Step S2: Establish an inversion m...
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The invention discloses a transient electromagnetic fast statistical inversion method, which belongs to the technical field of geophysical signal processing and analysis. Set the model dimension variation range of the inversion model to (1‑kN 0 ) and the iterative convergence condition of the inversion, when the iterative convergence condition of the inversion is satisfied, the variance of the data fitting and the change of the model dimension are stable enough in the iterative process of a single Markov chain; The data is subjected to fast statistical inversion. When the iterative convergence condition of the inversion is reached, the posterior probability density function estimation result of formation resistivity and formation depth is obtained, and the fast statistical inversion is completed. The present invention optimizes the efficiency of the transient electromagnetic statistical inversion method and improves the engineering practicability of the algorithm, which is of great significance for promoting the application of transient electromagnetic in urban underground space and tunnel engineering exploration.
Description
technical field [0001] The invention relates to the technical field of geophysical signal processing and analysis, in particular to a transient electromagnetic fast statistical inversion method. Background technique [0002] The transient electromagnetic method uses an ungrounded return line or a grounded electrode to send a pulsed electromagnetic field to the ground. Under the excitation of a pulsed magnetic field, an eddy current is induced in the underground conductive geological body. An induced secondary transient magnetic field is formed. By observing the variation law of the induced secondary transient magnetic field with time, the electrical characteristics (mainly resistivity) of the earth can be studied to solve related geological problems. The inversion of the resistivity of the subsurface medium from the induced secondary transient magnetic field is one of the most important steps in transient electromagnetic exploration. [0003] The inversion of the transient...
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 林君陈健张洋严复雪
Owner JILIN UNIV