Method and device for electromagnetic prospecting

Abstract

The invention provides a method and device for electromagnetic prospecting. The method comprises the steps that parallel measuring lines are arranged on both sides of a two-dimensional measuring line in a wide line observation area, wherein the parallel measuring lines are located between a first excitation source and a second excitation source; the first excitation source is excited, a first signal observed at a first measuring point on the two-dimensional measuring line is acquired, and a second signal which is observed at a second measuring point on the parallel measuring line corresponding to the first measuring point is acquired; the second excitation source is excited, a third signal observed at the first measuring point is acquired, and a fourth signal observed at the second measuring point is acquired; and signal weighted stacking is carried out to the first signal and the second signal, the signal weighted stacking is carried out to the third signal and the fourth signal, and the stacked signals are taken as a single-point and single-time observation signal of the first excitation source and a single-point and single-time observation signal of the second excitation source towards the first measuring point respectively. The method and device provided by the invention solve the technical problem that data observation accuracy is not high and effectively monitoring of side information cannot be realized during application of an electromagnetic prospecting method in the prior art.

Description

technical field [0001] The invention relates to the technical field of geological prospecting, in particular to an electromagnetic prospecting method and device. Background technique [0002] Onshore controllable source electromagnetic exploration is a general term for a class of methods that use artificial field sources to excite to obtain underground information. This type of method is widely used in geological surveys, oil and gas exploration, Geothermal, metal deposits, hydrology, environment, etc. [0003] Furthermore, considering that in complex areas with complex geological conditions, abundant interference, and low signal-to-noise ratio, the cost of 3D exploration is high and sometimes it cannot be carried out effectively. The electromagnetic method, the artificial source audio frequency magnetotelluric method, etc.) mostly adopt the observation method of unilateral and single field source single excitation and one coverage. This single-line two-dimensional acquisit...

AI Technical Summary

Problems solved by technology

[0006] An embodiment of the present invention provides an electromagnetic prospecting method to solve the problems of low accuracy of observation data and inability to effectively monitor side information in the existing electromagnetic prospecting method. The method includes:

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