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TEM one-dimensional forward modeling method applicable to irregular transmitting loop

An irregular and forward modeling technique, applied in the field of one-dimensional forward modeling of transient electromagnetic method

Inactive Publication Date: 2014-05-07
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

At present, the related literature of transient electromagnetic method at home and abroad mainly involves the calculation of the response of circles, rectangles and some simple polygons in terms of spatial expansion sources. Because the calculation methods are all for specific shapes, it often faces problems in actual operations. big deficiency

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  • TEM one-dimensional forward modeling method applicable to irregular transmitting loop
  • TEM one-dimensional forward modeling method applicable to irregular transmitting loop
  • TEM one-dimensional forward modeling method applicable to irregular transmitting loop

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0017] In the actual operation of transient electromagnetic, due to the topography of the exploration site, human factors and other reasons, the launch loops are often irregular. Suppose a relatively common situation: in the process of laying the launch loop in the actual operation, due to rivers, forests, etc. Or hills and other reasons, the square loop is laid into an irregular shape as shown in Figure 2. Because the traditional processing method generally replaces the irregular loop with a circular loop of equal area to calculate its response.

[0018] The invention directly starts from the time domain, takes the response of the magnetic dipole as the basic response, and obtains the response of the loop with any shape ...

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Abstract

The invention discloses a transient electromagnetic forward modeling method applicable to an irregular transmitting loop. The method comprises the steps of using a ground point corresponding to the center of a receiving coil as an original point, building a cylindrical-coordinate system, and building a frequency domain expression of the vortex electric field component at a receiving point; presenting the frequency domain expression of the vortex electric field component as a Hankel integral form, and working out the response magnitude of the frequency domain of the vortex electric field component; working out the response magnitude of the time domain of the vortex electric field component; recording coordinates of inflection points of the irregular transmitting loop, and obtaining a function expression of a segmented loop between every two adjacent inflection points; conducting integration on the segmented loops by using time domain response of the vortex electric field component so as to obtain the voltage value of each segmented loop, and calculating the sum of the voltage values of all the segmented loops so as to obtain transient response of the irregular transmitting loop. The method is applicable to a ground, ocean and aviation transient electromagnetic method one-dimensional forward modeling algorithm of the irregular transmitting loop.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a transient electromagnetic method (TEM) one-dimensional forward modeling method suitable for irregular emission loops. Background technique [0002] Transient electromagnetic method is a method to detect the geoelectric characteristics of underground geological structures by emitting electromagnetic waves to the ground. The transient electromagnetic method generally uses a large loop to transmit electromagnetic waves to the ground, and then uses a receiver similar to a magnetic dipole to receive the reflected echoes of the underground medium. Subsurface geoelectric characteristics and even geological structures can be interpreted through post-processing. Transient electromagnetic methods can be used in the exploration of resources such as base metal ores, groundwater, and oil. It is a very important non-seismic exploration method in national energy exploration. [0003] In...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
Inventor 齐有政黄玲武欣方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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