Method and device for processing magnetotelluric data

A magnetotelluric and data technology, applied in the field of geophysical exploration, can solve problems such as inability to identify, and achieve the effect of improving the ability to reflect

Active Publication Date: 2018-07-24
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] The inventor finds that there are at least the following problems in the prior art: the existing method for processing electromagnetic data of this type can generally obtain better results in regions with a large low-resistivity layer thickness (for example, a thickness of more than 300 meters) and a large difference in resistivity. Good results; however, low-resistivity thin layers (e.g., less than 200 m thick) in volcanic basins, volcanic reservoir target areas are often not identified

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  • Method and device for processing magnetotelluric data

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Embodiment Construction

[0038] Embodiments of the present application provide a method and device for processing magnetotelluric data.

[0039] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0040] figure 1 It is a flow chart of an embodiment of the processing method of magnetotelluric data in this application. refer to figure 1 , the processing method of the magnetotelluric data may include the following steps:...

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Abstract

The embodiment of the application discloses a method and device for processing magnetotelluric data. The method comprises: collected three-dimensional magnetotelluric data are obtained and three-dimensional resistivity inversion is carried out on the three-dimensional magnetotelluric data to obtain a three-dimensional resistivity data volume; logarithm taking operation is carried out on first profile resistivity data of the three-dimensional resistivity data volume and meshing processing is carried out to obtain mesh profile data; first frequency domain bit field processing is carried out on the mesh profile data and a processing result is filtered; second frequency domain bit field processing is carried out on the filtered result to obtain target mesh profile data and low-resistance electromagnetic data are screened from the target mesh profile data to obtain low-resistance thin-layer weak information. With the processing method and device, the low-resistance thin layer can be identified.

Description

technical field [0001] The present application relates to the technical field of geophysical prospecting, in particular to a processing method and device for magnetotelluric data. Background technique [0002] In the field of geophysical prospecting technology, magnetotelluric method is a conventional prospecting method. The basic principle of the magnetotelluric method is: according to the principle that electromagnetic waves of different frequencies have different skin depths in the conductor, the earth's electromagnetic response sequence from high frequency to low frequency is measured on the surface, and the earth's electromagnetic response sequence from high frequency to low frequency is obtained through relevant data processing and analysis. deep electrical structures. The magnetotelluric method is widely used because it does not require artificial field source excitation, has strong penetration ability of electromagnetic waves to high-resistivity rock formations, and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 刘云祥宋绍江胡祖志孟玉宇赵文举许士朝
Owner BC P INC CHINA NAT PETROLEUM CORP
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