Controllable seismic source system for electromagnetic high-power shallow earthquake

A high-power, electromagnetic technology, applied in the fields of seismology, geophysical measurement, instruments, etc., can solve the problems of low scanning frequency of the system and cumbersome field work, and achieve the effect of improving the frequency sweeping range, optimizing the design, and making the construction lighter.

Inactive Publication Date: 2004-07-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention discloses an electromagnetic high-power shallow seismic vibrator system, which solves the problems of low system scanning frequency and heavy field work caused by the existing vibrator drive mode

Method used

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  • Controllable seismic source system for electromagnetic high-power shallow earthquake
  • Controllable seismic source system for electromagnetic high-power shallow earthquake
  • Controllable seismic source system for electromagnetic high-power shallow earthquake

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Embodiment Construction

[0023] Refer to attached figure 1 , the main control chassis mainly includes the servo system ③, the signal generation card ①, and the power amplification component ②. In the servo system ③, there is a signal bus of the industrial control PC. It is also responsible for performing real-time phase control according to the currently set system working environment and the signal fed back from the substrate of the exciter ④, so that the phase difference between the substrate 12 signal and the driving signal is controlled within a certain range; and through the system synchronization trigger unit 34, An effective synchronous trigger protocol is provided to the seismic wave observation instrument; human-computer interaction is realized through the keyboard 35 and the LCD screen 36 .

[0024] The signal generating card ① is composed of a crystal oscillator clock 13, DDS AD7008 14, a digital / analog converter 18 and a signal filter 19, etc. The card can output arbitrary waveforms, signa...

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Abstract

A controllable high-power electromagnetic seismic source system for shallow earthquake is composed of main controller and exciting unit. Under the control of industrial control PC, the DDS generates pulse signals, which can trigger counter and waveform storage to release digital waveforms. Going through D / A converter and filter, they are output to power amplifier for driving exciter to generate vibration and send it in ground. The earthquake signal is picked up by sensor and then compared with the predefined waveforms stored in PC, so forming a closed control loop. Its advantages are high saefty, high repeatability of signals, and wide frequency sweep range (5-1400 Hz).

Description

Technical field: [0001] The invention relates to a controllable non-explosive source, specifically an electromagnetic high-power shallow seismic controllable source system, belonging to the technical field of source generating devices for seismic exploration. Background technique: [0002] The vibrator is a non-explosive source developed for the purpose of overcoming the defects of the explosive source. Foreign countries began to study hydraulically driven vehicle-mounted vibrators in 1952. The signal frequency scanning range is 6-180Hz, and the maximum output force is tens of KN. After decades of development and improvement, the hydraulically driven vibrator has become the main vibrator in the field of oil and gas exploration abroad, and the utilization rate is as high as 70%. However, due to the low system scanning frequency and cumbersome field work caused by its driving mode, it is more and more difficult to apply to the requirements of shallow high-resolution seismic e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/143
Inventor 林君陈祖斌于生宝张子三梁铁成
Owner JILIN UNIV
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