An electromagnetic detection method and device
An electromagnetic detection and detection area technology, which is applied in the field of geophysical exploration, can solve the problems of weak information signal and affect the efficiency of construction, and achieve the effects of strong signal strength, improved construction efficiency, and convenient processing
Active Publication Date: 2017-10-17
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
[0004] In the process of implementing this application, the inventor found that there are at least the following problems in the prior art: the existing time-frequency electromagnetic method is suitable for observations in distant areas where the distance from the emission source to the survey line is relatively large, and for areas with relatively large grounding resistance, The collected information signal is very weak, which affects the efficiency of construction
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[0063] Embodiments of the present application provide an electromagnetic detection method and device.
[0064] 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.
[0065] figure 1 It is a flowchart of an embodiment of an electromagnetic detection method in the present application. Such as figure 1 As shown, the electromagnetic detection method may include:
[0066] S101: Obtain detection area in...
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The embodiment of the present application discloses an electromagnetic detection method and device. The method includes: obtaining the detection area information and the maximum detection depth; Calculation parameters of domain emission waveform; detect the detection area according to the determined calculation parameters, and obtain detection information data; calculate the time domain SNR factor of the detection information data, and calculate the time domain SNR factor according to the time domain SNR factor Judging the validity of the detection information data; calculating the equivalent apparent resistivity of the detection area in the time domain and frequency domain, the apparent charging rate of the time domain electric field information, and the frequency domain electromagnetic field information according to the judgment result being valid detection information data The amplitude polarization coefficient of . The electromagnetic detection method and device disclosed in the embodiments of the present application can ensure that information with strong signals is collected and improve construction efficiency.
Description
technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to an electromagnetic detection method and device. Background technique [0002] Magnetotelluric prospecting is an important prospecting method in geophysical prospecting, and has important applications in oil and gas prospecting, geothermal prospecting, tectonic prospecting, and crustal, volcanic and seismic studies. Through electromagnetic detection technology, exploration personnel can obtain orthogonal electromagnetic and magnetic fields, as well as formation characteristic parameters such as apparent resistivity, so as to infer information such as the thickness of the formation and the location of oil and gas targets. [0003] The time-frequency electromagnetic method is an electromagnetic detection method that is widely used at present. The time-frequency electromagnetic method mainly includes: using a large horizontal long wire source to excite square waves o...
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IPC IPC(8): G01V3/38G01V3/12
Inventor 王志刚何展翔
Owner BC P INC CHINA NAT PETROLEUM CORP