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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

Pending Publication Date: 2022-07-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Although this method obtains a high-resolution GR profile of the target area, the steps of this method are relatively complicated.

Method used

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  • Magnetotelluric frequency division tomography inversion method
  • Magnetotelluric frequency division tomography inversion method
  • Magnetotelluric frequency division tomography inversion method

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Embodiment 1

[0032] A method for inversion of magnetotelluric frequency division tomography, comprising the following steps:

[0033] Step 1. Estimate effective exploration depth based on observation point frequency data

[0034] The depth reached when most of the energy of the electromagnetic wave (about 63%) is absorbed is called the skin depth, which is estimated by the formula: where ρ is the apparent resistivity, and f is the frequency corresponding to the apparent resistivity. And the depth when the electromagnetic wave energy is attenuated to 50% becomes the effective exploration depth, and its estimation formula is: The effective exploration depth is estimated according to the above formula for all frequency point data of all observation points.

[0035] Step 2. Group the frequency point data:

[0036] Firstly, according to the effective exploration depth and the determined inversion depth, the frequency point data is divided into two groups: the data in the inversion area and...

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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.

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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Application Information

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IPC IPC(8): G01V3/38
CPCG01V3/38Y02A90/30
Inventor 相鹏张奎华王树华冯国志李竹强陈学国吴微郭涛乔玉雷张建华
Owner CHINA PETROLEUM & CHEM CORP
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