Time domain processing method for transient electromagnetic data
A transient electromagnetic and processing method technology, applied in the field of electromagnetic exploration data processing, can solve the problem of low resolution and achieve the effect of improving resolution and making accurate and reliable judgments
Active Publication Date: 2017-05-03
PETROCHINA CO LTD
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[0005] Existing techniques process TEM data in the frequency domain, which has low resolution for target geological bodies at different burial depths
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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0030] An embodiment of the present invention provides a time-domain processing method for transient electromagnetic data, including the following steps:
[0031] Step 101, using the transient electromagnetic method to explore the target geological body, obtaining transient electromagnetic data, and drawing an induced electromotive force-time curve according to the transient electromagnetic data.
[0032] Step 102, smoothing the induced electromotive force-time curve by using a weighted average method to eliminate noise interference.
[0033] Step 103, eliminating the background induced electromotive force from the smoothed induced electromotive force-time curve.
[0034] Step 104, according to the induced electromotive force-time cur...
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The invention discloses a time domain processing method for transient electromagnetic data, and belongs to the technical field of electromagnetic prospecting data processing. The method comprises the steps: obtaining the transient electromagnetic data through a transient electromagnetic method, obtaining an induced electromotive force - time curve according to the transient electromagnetic data; carrying out the smoothing of the induced electromotive force - time curve through employing a weighted mean method, and removing the noise interference; removing a background induced electromotive force from the induced electromotive force - time curve after smoothing, calculating the relaxation intensity of the induced electromotive force at each moment according to the above, obtaining the time function of the relaxation intensity, and converting the time function of the relaxation intensity into a depth function of the relaxation according to a time-depth relation; taking the position of an inspecting test point as the x-coordinates, taking the burial depth of a target geologic body as the y-coordinates, taking the depth function of the relaxation intensity as a parameter, and obtaining a contour line profile map of the relaxation intensity through employing drawing software. The method provided by the invention improves the resolution for the target geologic body, and is accurate and reliable in conductivity judgment.
Description
technical field [0001] The invention relates to the technical field of electromagnetic exploration data processing, in particular to a time-domain processing method for transient electromagnetic data. Background technique [0002] The transient electromagnetic method is also called time domain electromagnetic methods (TEM), which uses an ungrounded return line or a grounded line source to transmit a pulsed magnetic field underground, and uses a coil or a grounded electrode to observe two The method of the sub-eddy current field is widely used in oil and gas exploration, mineral investigation, coal mine safety, water search, geothermal exploration, engineering geology and environmental monitoring and other fields. [0003] Usually, the transient electromagnetic data obtained by the transient electromagnetic method survey, such as the induced electromotive force, is usually processed in the frequency domain, for example, using different time windows to convert the induced elec...
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IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 汪剑陈清礼史原鹏谷文彬肖阳严良俊刘静徐玉平卢永合余小林刘立新谭青松叶秋焱
Owner PETROCHINA CO LTD