Magnetotelluric frequency division tomography inversion method

A tomographic inversion and magnetotelluric technology, applied in the field of geophysical inversion, can solve problems such as complex steps, achieve the effects of improving resolution, solving low resolution in deep layers, and improving ill-posedness
CN114764151APending Publication Date: 2022-07-19CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2022-07-19

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Abstract

The invention relates to the technical field of geophysical inversion, in particular to a magnetotelluric frequency division tomography inversion method. The method comprises the following steps: estimating an effective exploration depth according to frequency point data of an observation point; grouping the frequency point data; establishing a gridding model; constructing an initial resistivity model; performing frequency division tomography inversion; and evaluating an inversion result. According to the method, the magnetotelluric data are grouped according to the frequency, inversion is performed layer by layer from the shallow layer to the deep layer, the discomfort of inversion is improved, effective information of the magnetotelluric data, especially low-frequency data, is fully excavated, the resolution of the deep layer is improved, and the problem that existing magnetotelluric inversion is low in resolution of the deep layer is solved.
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Description

technical field

[0001] The invention relates to the technical field of geophysical inversion, in particular to a method for inversion of magnetotelluric frequency division tomography. Background technique

[0002] The magnetotelluric exploration technology has a large detection depth, is not shielded by high-resistance and high-speed formations, and has fast and inexpensive data acquisition and processing. It has played an important role in oil and gas exploration, regional geological surveys and other fields for a long time. Magnetotelluric inversion is a process of obtaining the resistivity model of the underground space by using the surface observation data under the constraints of prior information and geological laws, and then using the resistivity model to interpret the underground structure. The magnetotelluric inversion is usually carried out in the frequency domain, and the frequency range of the observation data is about 10 -4 -10 4 Hz, oil and gas exploration is...

Claims

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