High-resolution towed transient electromagnetic data preprocessing method

Abstract

The invention relates to the field of geophysical signal processing and analysis technology research, especially to a high-resolution towed transient electromagnetic data preprocessing method. The towed transient electromagnetic integral data are converted into multi-measuring-point data according to a product of a transmitting period and a sampling rate; then, according to the relationship between the transient electromagnetic penetration depth and the propagation time, measuring point data is segmented, the signal-to-noise ratio of early segmented data is high, and a small amount of shallowinformation is superposed according to a high relevancy principle, so that the shallow transverse resolution is improved; and the advanced signal-to-noise ratio is low, and the longitudinal resolutionis improved by superposing a plurality of geologic bodies with better deep continuity. The data superposition method can effectively improve the signal-to-noise ratio of the measuring point data without reducing the number of the measuring points, ensures the shallow transverse abnormal resolution and the deep longitudinal resolution of later data interpretation, and has good practical application value.

Description

technical field [0001] The invention relates to the research field of geophysical signal processing and analysis technology, in particular to a high-resolution drag type transient electromagnetic data preprocessing method. Background technique [0002] Towed transient electromagnetic detection refers to the ground transient electromagnetic system towed by humans or all-terrain vehicles. Its transmitting system can work continuously during the towing process, and the receiving system synchronously collects the whole process of full waveform signal data; compared with the traditional Ground transient electromagnetic fixed-point layout detection, the towed detection device can detect underground geological structures more efficiently and quickly, so it has attracted more and more attention from scientific researchers. However, due to the particularity of continuous motion detection of towed transient electromagnetic devices, the collected data is easily affected by power freque...

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Problems solved by technology

However, due to the particularity of continuous motion detection of towed transient electromagnetic devices, the collected data is easily affected by power frequency noise, spike noise, random noise, and motion noise. Due to continuous motion, ground transients cannot be used for data processing. The fixed-point multiple stacking method of the electromagnetic method is used to improve the signal-to-noise ratio of the data; and because its moving speed is relatively slow and the distance of the survey line is short, it is also impossible to use the airborne transient electromagnetic method to directly stack the data of adjacent measuring points, which will be lost Lateral Anomaly Resolution

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