Magnetic reference processing method for acquiring data in three dimensions audio-frequency magnetotelluric sounding

An audio magnetotelluric and sounding technology, applied in the field of comprehensive exploration, can solve problems such as low work efficiency, high cost, interference, etc., and achieve the effect of improving work efficiency

Inactive Publication Date: 2015-05-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking the measuring point as the smallest measurement unit, the horizontal electric field component is measured at all measuring points, and the horizontal magnetic field component is measured at limited measuring points. Multiple measuring points are connected to form a measuring line to complete the two-dimensional inversion interpretation of the geological structure. The working efficiency of the method is low, the cost is high, and the exploration ability is limited for complex geological areas
Secondly, the existing acquisition technology is susceptible to interference in strong interference areas, and it is difficult to obtain high-quality magnetic field data, and the quality of data is difficult to guarantee, which often leads to difficulties or even errors in later interpretation

Method used

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  • Magnetic reference processing method for acquiring data in three dimensions audio-frequency magnetotelluric sounding
  • Magnetic reference processing method for acquiring data in three dimensions audio-frequency magnetotelluric sounding
  • Magnetic reference processing method for acquiring data in three dimensions audio-frequency magnetotelluric sounding

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example 1

[0055]A local geological exploration experiment was carried out in a small basin. The survey area is 2,400 square kilometers, divided into survey grids with a length and a width of 1,000 meters. The detection depth is from 50 meters to 1500 meters. To test the effectiveness and accuracy of the magnetic reference processing method, CSAMT data acquisition was performed at two locations (S1, S2), and the Ex and Hy components at each location were observed. where S2 is designated as the magnetic reference station. The distance between S1 and S2 is 2000 meters. image 3 Shows the comparison of accurate Carnia apparent resistivity curves and magnetic reference processing methods. It can be observed from the figure that the magnetic reference processing apparent resistivity curve at S1 calculated from the magnetic field component at S2 is very consistent with the exact apparent resistivity curve at S1. The statistical results of the standard deviation are shown in Table 3. It can...

example 2

[0059] The scalar CSAMT method and the MRTC method were used on a real survey line in the area two kilometers away from the magnetic reference datum point. Figure 4 Apparent resistivity profiles for two different data acquisition methods. Figure 4 The upper figure in the figure is the conventional scalar CSAMT Carnia apparent resistivity contour, and the lower figure is the apparent resistivity contour obtained by using the magnetic field of the reference datum point for magnetic reference processing. Comparing the contour lines of the upper and lower graphs in the figure, they are almost identical.

[0060] Model experiments and field experiments strongly prove that the present invention is an effective method, which makes CSAMT more flexible and maneuverable.

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Abstract

The invention discloses a magnetic reference processing method for acquiring data in three dimensions through audio-frequency magnetotelluric sounding. The method can be used for acquiring high-quality electromagnetic field data. The method comprises the following steps: three-dimensional observation is conducted; observation points are distributed as a rectangular net on a rugged topography surface; a net observation density is defined according to an exploration proportional scale and the requirement of exploration depth; an electric channel is observed and a magnetic field component value is calculated at each observation point; the Cagniard resistivity corrected by the observation points is calculated by using the magnetic reference data. The magnetic reference processing method can be used for improving the working efficiency, independently collecting magnetic channels and electric channels and acquiring high-quality electromagnetic field data.

Description

technical field [0001] The invention belongs to the technical field of comprehensive exploration such as gravity, magnetoelectricity and the like, and relates to a magnetic reference processing method for three-dimensional acquisition data of audio magnetotelluric sounding. Background technique [0002] Controlled Source Audio Frequency Magnetotelluric (CSAMT) is an electromagnetic sounding method that uses a grounded galvanic couple source or a magnetic couple source as a signal source. The working frequency of this method is audio frequency, and its essence is the magnetotelluric sounding method (MT) which uses the artificially excited electromagnetic field to make up for the energy shortage of the natural field. Its acquisition method and data processing method are quite different from MT. CSAMT has the advantages of high quality and good repeatability of field data, simple interpretation and processing method (interpretation method directly applies MT method), high later...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
Inventor 严良俊何展翔谢兴兵王志刚凌云唐新功刘雪军向葵
Owner BC P INC CHINA NAT PETROLEUM CORP
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