Transient electromagnetic multichannel coverage observing device and method

A transient electromagnetic and observation device technology, applied in the field of resource exploration, can solve the problem of not having multiple observation systems and achieve effective detection

Inactive Publication Date: 2016-12-07
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] However, as another important prospecting method of electromagnetic prospecting—transient electromagnetic method (TEM), although the study of TEM quasi-seismic method has made great breakthroughs, there is no multi-dimensional method similar to seismic prospecting at present. Secondary Observing System Approach

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  • Transient electromagnetic multichannel coverage observing device and method
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  • Transient electromagnetic multichannel coverage observing device and method

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Embodiment

[0076] The sample survey area is geologically located on the Suqiao-Woukou buried hill structural belt. The survey area is mainly Quaternary, Tertiary, Upper Paleozoic Carboniferous-Permian and Lower Paleozoic Ordovician strata. It is 4000-6000m, its resistivity is less than 15 ohm meters, the underlying Ordovician limestone is a high-resistance formation, several hundred-2000 ohm meters, the oil reservoir is Carboniferous-Permian porous sandstone oil and gas reservoir, river Fracture-type quartz sandstone of Changzhougou Formation in Jianshan Great Wall System. The structure is a monoclinic structure, leaning eastward to westward. There are many fractures. The survey line length is 6km, the transmitting pole distance is 600m, and the receiving pole distance=50m. Such as Image 6 The test line and seismic section are shown in ( Image 6 ).

[0077] At the first end of the survey line, the first ground electrode is laid, and the second ground electrode is placed at a certain di...

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Abstract

The application puts forward a transient electromagnetic multichannel coverage observing device and method. The method comprises the following steps: emission currents are injected underground via emitting electrodes at a plurality of emitting points; a plurality of receivers that are interconnected are used for orderly receiving underground induction signals, caused by the emission currents, of all emitting points; according to transient electromagnetic observation data obtained by distributed collection stations, wave filed conversion operation and data extension operation are performed, and virtual seismic data of a measuring line at any underground depth is obtained; according to the virtual seismic data of the measuring line at any underground depth, an underground virtual seismic cross-section diagram is drawn; according to change of lineups on the virtual seismic cross-section diagram, an undulation condition of an underground lithologic layer interface can be determined; in a condition of large electromagnetic interference, dense population and plenty of buildings, underground coal-bearing structures of urban areas can be effectively detected step by step, various kinds of detection results supplement each other, and therefore the underground coal-bearing structures of the urban areas can be effectively detected.

Description

Technical field [0001] The invention relates to the field of resource exploration, in particular to a transient electromagnetic multi-channel coverage observation device and method. Background technique [0002] The basic idea of ​​multiple coverage technology in geophysical prospecting is: according to a certain observation plan, to achieve multiple observations of a geological target at a certain underground location, and multiple observations of a geological target at a certain underground location The observation information is superimposed to form the overall geophysical information at this location, which can ensure that even if the quality of individual observations is poor, the effective information of the target at that location underground can be obtained, thereby improving the quality of observation. [0003] The multiple coverage in seismic exploration is actually to make multiple observations of the same reflection section underground. After dynamic and static correcti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCG01V3/083
Inventor 底青云薛国强雷达
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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