A joint inversion method of gravity data and magnetotelluric data
A technology of magnetotelluric and gravity data, applied in electrical digital data processing, special data processing applications, CAD numerical modeling, etc., can solve the problems of non-convergence in the iterative process, influence on the final result, slow calculation speed, etc., and avoid iterative failure Effects of convergence problems, reduction of inversion calculation time, and improvement of accuracy
Active Publication Date: 2019-05-24
临沂临港水务有限公司
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This has the following disadvantages: first, the initial model is a uniform half-space, and the calculation speed is slow, which may lead to too many iterations and low efficiency; second, the data quality of various geophysical methods is not the same. Data, starting from the uniform half-space model for the first inversion iteration, will cause error accumulation in the subsequent iteration process, which will affect the final result and even cause the iteration process to fail to converge
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[0017] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0018] figure 1 is the flow chart of the joint inversion method of gravity data and magnetotelluric data, figure 2 is the flowchart of the inversion step in step 4). Such as Figure 1-2 As shown, the joint inversion method of the present invention includes:
[0019] Step 1), data acquisition step: select 100 measurement points in the work area in advance, and the point distance is 50 meters, and collect gravity data and magnetotelluric data respectively at the measurement points, wherein the gravity data refers to residual gravity data, magnetotelluric data Refers to electric field data and magnetic field data.
[0020] Step 2), data screening step: calculate respectively the percentage r1 and r2 of the data amount of the jump data in the gravity data and the magnetotelluric data accounted for the respective data total amount, whe...
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The invention discloses a gravity data and magnetotelluric data joint inversion method. The method comprises a data collection step, a data screening step, an initial model determination step and a joint inversion step. By taking data quality as a standard, an initial model during joint inversion iteration is selected. Compared with a uniform semi-space model given in a unified way in the prior art, the method has the following beneficial effects that the joint inversion efficiency is improved, the inversion calculation time is shortened, the problem of iterative misconvergence caused by dataerrors is avoided, and the precision of a joint inversion result is improved.
Description
technical field [0001] The invention relates to a geophysical inversion method, in particular to a joint inversion method of gravity data and magnetotelluric data. Background technique [0002] The basic process of geophysical inversion is as follows: firstly, the initial model is given, the model update amount is searched according to the algorithm, the model is updated, and then the error between the theoretical data calculated by the current model and the actual data is calculated, and the model update amount is searched again, and so on. Until the error converges or the maximum number of cycles is reached. The subsurface resistivity model can be inverted from the magnetotelluric data, and the subsurface density model can be inverted from the gravity data. The so-called joint inversion refers to the inversion of two or more geophysical data at the same time to obtain a unified geological model that satisfies all the geophysical data participating in the inversion. The h...
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IPC IPC(8): G06F17/50
CPCG06F30/20G06F30/367G06F2111/10G06F2119/06
Inventor 张辉赵权贵李嘉炎
Owner 临沂临港水务有限公司