Low-frequency electro-acoustic emission array for suppressing bubble pulse based on symmetrical hard interface structure

Abstract

The invention discloses a low-frequency electro-acoustic emission array for suppressing bubble pulses based on a symmetric hard interface structure, and belongs to the field of marine seismic exploration. The low-frequency electro-acoustic emission array comprises a metal grounding frame and a plurality of electro-acoustic units which are fixed in the metal grounding frame and arranged side by side, and the input ends of the electro-acoustic units are connected with pulse cables through high-voltage input ports; the electro-acoustic unit comprises a single-flat-cable electrode array and hard interface structures symmetrically arranged on the two sides of the single-flat-cable electrode array. According to the invention, the initial bubble ratio of the electric spark source can be obviously improved, the sound pulse with lower frequency can be generated, the detection depth of the electric spark source is further improved, and the application prospect is good.

Description

technical field [0001] The invention belongs to the field of marine seismic exploration, in particular to a low-frequency electroacoustic emission array based on a symmetrical hard interface structure to suppress bubble pulses. Background technique [0002] Due to its outstanding advantages of high resolution, high repeatability and wide frequency band, EDM sources are widely used in marine high-resolution seismic exploration. The spark source mainly includes pulse power supply, pulse transmission line and multi-electrode emission array. [0003] For example, the Chinese patent document with publication number CN106932814A discloses a marine high-resolution three-dimensional vertical time-delay electric spark source, and the Chinese patent document with publication number CN206710620U discloses a marine high-resolution three-dimensional vertical array electric spark source. [0004] At present, the multi-electrode emission array of the spark source generally includes a fish...

AI Technical Summary

Problems solved by technology

[0005] The idea adopted for the line array combination structure is to use a large number of electrodes to reduce the excitation energy of each electrode to about 5J, and the electrode spacing is about 1-2cm, so the bubble pulse is small, but on the one hand, a large number of electrodes will cause the volume of the emission array On the other hand, due to the small load impedance, the discharge time is short, and the main frequency of the generated sound pulse is high

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