CN1237351C - Phase-control controllable seismic focus system - Google Patents
Phase-control controllable seismic focus system Download PDFInfo
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- CN1237351C CN1237351C CN 200410010711 CN200410010711A CN1237351C CN 1237351 C CN1237351 C CN 1237351C CN 200410010711 CN200410010711 CN 200410010711 CN 200410010711 A CN200410010711 A CN 200410010711A CN 1237351 C CN1237351 C CN 1237351C
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Abstract
The present invention discloses a phase-control controllable seismic focus system. The present invention uses a main control unit to control more than one or even N controllable seismic focus substation, the main control unit realizes the human-computer interaction by a liquid crystal screen and a keyboard, obtains parameters by an E<2>PROM, and realizes the master-slave computer interaction by communication modules; each controllable seismic focus substation is composed of a control module, a signal generation module, a power amplification module and a communication module, the communication module receives information and controls a DDS to generate scanning waveforms, and the scanning waveforms are transferred into a power amplification driver and a quake exciter after the wave filtering to generate quake which is transferred into ground. After the controllable seismic focus substations receive the scan command from the main control unit, the seismic waves in the ground set regions form inphase superposition by controlling the phase positions of the scanning signals, the seismic waves in the other regions are counteracted, and the wave beam orientation is realized. The present invention has the advantages of bandwidth scanning signals, repeatable scanning, etc., increases the output force, meets the requirement of the high-resolution seismic prospecting in shallow layers, and realizes the oriented prospecting.
Description
Technical field:
The present invention relates to the non-explosive source that a kind of shallow seismic exploration is used, especially vibroseis.
Background technology:
Existing non-explosion type seismic exploration seismic source has hydraulic pressure vehicular vibroseis and electromagnetic drive type vibroseis.What generally adopt at petroleum exploration domain is hydraulic pressure vehicular vibroseis, and its signal frequency range is at 6-500HZ,, maximum power output is tens KN.But because the system scan frequency band is narrow, volume is big, field work is heavy, is unsuitable for the shallow-layer high-resolution seismic survey.The vibroseis of electromagnetic drive type is a kind of portable vibroseis that designs at the shallow-layer high-resolution seismic survey.Existing product is that Japanese OYO company " vibroseis " power output of producing is limited, only is 500N.CN1643891 disclosed " controllable seismic source system for electromagnetic high-power shallow earthquake ", its swept frequency range is at 5-1400HZ, and power output is 1000N, and its sweep waveform is restricted by the waveform storage depth, be difficult to produce complicated wave form, be unfavorable for the shallow-layer high-resolution seismic survey.And, the seismic event that existing all focus produce underground be that semispace is propagated, just wherein the sub-fraction that is really received by geologic body and reflect both can't realize directed exploration, had caused the waste of energy again.This also is the common defects of existing various focus.
Summary of the invention:
The objective of the invention is to shortcoming and defect at above-mentioned prior art, the shake of having delayed time of a kind of a plurality of focus is provided, can make seismic event in underground setting regions with superimposed, sweep waveform is not restricted by the waveform storage depth, swept frequency range is wide, but multiple scanning, and can the directed phased earthquake controllable earthquake focus system of exploring.
The present invention realizes by following manner:
1. control module comprises single-chip microcomputer 22, control module 23, state indication 20 and synchronous triggering unit 19, single-chip microcomputer 22 common I/O mouths link to each other with control module 23 with synchronous triggering unit 19, state indication 20 respectively, serial port is connected news module 21,1. control module is as microcontroller with single-chip microcomputer 22, P0 and P2 mouth are done data line and address wire, link to each other with the DDS module through storage battery conversion 15; According to the instruction of main control unit 1, make signal generating module DDS10 2. produce sweep waveform, after signal filtering 11 filtering, send into power amplifier module prime 3. and amplify 16 and drive 17 through power amplifier and send into power amplification output 18 and send into vibration exciter 24 again and produce vibrations;
2. signal generating module comprises crystal oscillator clock 9, DDS10 and signal filtering 11, and crystal oscillator clock 9 meets DDS AD9852 10 by CLK;
3. power amplifier module comprises prime amplification 16, power amplifier driving 17, power amplification output 18, overcurrent, overvoltage, overheat protector 14, steering logic 13 and state indication 12.
Good effect:, determine the spacing and the platform number of vibroseis substation 2 according to scope, the degree of depth of exploration requirement by a plurality of and even N the vibroseis substation 2 of a main control unit 1 control.By controlling the time-delay or the initial phase of each vibroseis substation 2 sweep waveforms, make seismic event in underground setting regions with superimposed, other area parts are offset, and have realized beams directed, and swept frequency range is wide, sweep time is long, but multiple scanning has improved capacity usage ratio, has realized the controlled and directed exploration of sweep waveform phase place, overcome the shortcoming that sweep waveform is restricted by the waveform storage depth, satisfied the requirement of high-resolution seismic survey.
Description of drawings:
Fig. 1 is phased earthquake controllable earthquake focus system general structure block diagram.
Fig. 2 is phased earthquake controllable earthquake focus system main control unit 1 structured flowchart.
Fig. 3 is phased earthquake controllable earthquake focus system vibroseis substation 2 structured flowcharts.
1. control module, 2. signal generating module, 3. power amplifier module.
1 main control unit, 2 vibroseis substations, 3 terminal build-out resistors, 4 Liquid Crystal Modules; 5 Keysheet modules, 6 parameter accesses, 7 communication modules, 8 single-chip microcomputers; 9 crystal oscillator clocks, 10DDS, 11 signal filterings, the indication of 12 states; 13 steering logics, 14 overcurrents, overvoltage, overheat protector, 15 level conversion, 16 primes are amplified; 17 power amplifiers drive, 18 power amplifications output, 19 synchronous triggering unit, the indication of 20 states; 21 communication modules, 22 single-chip microcomputers, 23 control modules, 24 vibration exciters.
Embodiment:
Be described further below in conjunction with drawings and Examples:
1. control module comprises single-chip microcomputer 22, control module 23, state indication 20 and synchronous triggering unit 19, single-chip microcomputer 22 common I/O mouths respectively with synchronous triggering unit 19, state indication 20 links to each other with control module 23, serial port is connected news module 21,1. control module is as microcontroller with single-chip microcomputer 22, P0 and P2 mouth are done data line and address wire, link to each other with the DDS module through storage battery conversion 15, instruction according to main control unit 1, make signal generating module DDS10 2. produce sweep waveform, after signal filtering 11 filtering, send into power amplifier module prime 3. and amplify 16 and drive 17 through power amplifier and send into power amplification output 18 and send into vibration exciter 24 again and produce vibrations;
2. signal generating module comprises crystal oscillator clock 9, DDS10 and signal filtering 11, and crystal oscillator clock 9 meets DDS AD9852 10 by CLK;
3. power amplifier module comprises prime amplification 16, power amplifier driving 17, power amplification output 18, overcurrent, overvoltage, overheat protector 14, steering logic 13 and state indication 12.
2. signal generating module is made up of crystal oscillator clock 9, DDS10 and signal filtering 11.Single-chip microcomputer 22 produces sweep waveforms by level transferring chip 15 control DDS10, and the linear sweep signal that is produced by DDS10 and amplitude, frequency, the phase place of multiple nonlinear sweep signal are all able to programme, can design various complicated sweep waveforms as required.
DDS10 also has or not transition frequency shift keying (UnrampedFSK), inclination frequency shift keying Ramped FSK except the sine wave that can produce single-frequency), 2 phase-shift keying (PSK)s (BPSK) and pulse-frequency modulation (CHIRP) pattern.But because DDS10 is spuious bigger, signal to noise ratio (S/N ratio) is low, and the 0.5V direct current biasing is arranged, and must could remove the spuious of DDS10 through signal filtering 11.Therefore need to be provided with Hi-pass filter and low-pass filter in signal filtering 11, Hi-pass filter removes direct current, and the low-pass filter denoising only in this way could obtain more satisfactory sweep waveform.
By the information interaction of communication module 21 realization principal and subordinate machines, comprising: main control unit 1 is to the parameter transmission of vibroseis substation 2, the start and stop of scanning etc.; The signal feedback that main control unit 1 is given in vibroseis substation 2, the operation conditions of monitoring vibroseis substation 2.Because adopt master-salve distributed structure, main control unit 1 is prior arts to the communication of vibroseis substation 2,, can solve by the timesharing transmission because there is bus collision in the communication of the 2 pairs of main control units 1 in vibroseis substation.
Phased earthquake controllable earthquake focus system adopts half-duplex mode, forms a distributed system by above vibroseis substation 2 of a main control unit 1 control, can also 1 to N vibroseis substation 2 be set according to need of work.For normally carrying out of communicating by letter, a terminal build-out resistor 3 need be respectively established at the telecommunication cable two ends.During work, main control unit 1 comprises initial, the termination frequency of scanning, scanning form, sweep time, triggering mode etc. earlier to 2 sweep parameters in each vibroseis substation; Send out the beginning scan command then, each vibroseis substation 2 starts scanning after receiving order, and they bases station number separately by controlling between time-delay or the phase place of sweep signal, starts scanning; Sweep signal is sent into pre-amplifier 16 after wave filter 11 filtering, through power amplifier drive 17 and power amplification output 18 deliver to vibration exciter 24 and realized simultaneously seismic event to underground transmission out of phase, to compensate between each focus because the phase differential that wave path-difference causes, make seismic event in underground a certain zone with superimposed, realized beams directed.
Claims (1)
1, a kind of phased earthquake controllable earthquake focus system that is mainly used in seismic prospecting, comprise main control unit and vibration exciter, it is characterized in that: main control unit (1) is through the telecommunication cable connection and control more than one and even N vibroseis substation (2), and terminal build-out resistor (3) is respectively established at the telecommunication cable two ends;
A. main control unit (1) comprises Liquid Crystal Module (4), Keysheet module (5), parameter access (6) and communication module (7), Liquid Crystal Module (4) and Keysheet module (5) are realized man-machine interaction by single-chip microcomputer (8), literal shows, single-chip microcomputer (8) passes through P0[0..7] with the DS[0..7 of LCD MODULE (4)] link to each other, and select CS with P2.0 contact pin, P2.1 meets data/address selection order RO, Keysheet module 5 adopts the rank scanning mode of 4*4, P2[0..7 by single-chip microcomputer (8)] make the rank scanning line, two I/O mouths of single-chip microcomputer (8) connect parameter access (6), serial port is connected letter module (7), and connects each vibroseis substation (2) by telecommunication cable;
B. vibroseis substation (2) comprising: control module 1., signal generating module 2., power amplifier module 3. and communication module (21);
1. control module comprises single-chip microcomputer (22), control module (23), state indication (20) and synchronous triggering unit (19), the common I/O mouth of single-chip microcomputer (22) respectively with synchronous triggering unit (19), state indication (20) links to each other with control module (23), serial port is connected news module (21), 1. control module is as microcontroller with single-chip microcomputer (22), P0 and P2 mouth are done data line and address wire, link to each other with the DDS module through storage battery conversion (15), instruction according to main control unit (1), make signal generating module DDS (10) 2. produce sweep waveform, after signal filtering (11) filtering, send into power amplifier module prime 3. and amplify (16) and drive (17) through power amplifier and send into power amplification output (18) and send into vibration exciter (24) again and produce vibrations;
2. signal generating module comprises crystal oscillator clock (9), DDS (10) and signal filtering (11), and crystal oscillator clock (9) meets DDS AD9852 (10) by CLK;
3. power amplifier module comprises that prime is amplified (16), power amplifier drives (17), power amplification output (18), overcurrent, overvoltage, overheat protector (14), steering logic (13) and state indication (12).
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CN 200410010711 CN1237351C (en) | 2004-03-03 | 2004-03-03 | Phase-control controllable seismic focus system |
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CN 200410010711 CN1237351C (en) | 2004-03-03 | 2004-03-03 | Phase-control controllable seismic focus system |
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CN1237351C true CN1237351C (en) | 2006-01-18 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102156295A (en) * | 2011-03-30 | 2011-08-17 | 吉林大学 | Vibroseis-based method for rapidly positioning trigger time mark of cable-free seismic detector |
CN101545981B (en) * | 2008-03-28 | 2012-07-18 | 中国石油天然气集团公司 | Method for realizing minimum phase of vibroseis seismic data zero-phase wavelet |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101320095B (en) * | 2008-07-22 | 2010-07-21 | 吉林大学 | Single-seismic source directional lighting seismic signal synthesizing method |
CN101339252B (en) * | 2008-08-08 | 2010-08-18 | 吉林大学 | Directional lighting seismic exploration method based on single earthquake focus |
EA201490404A1 (en) * | 2011-09-16 | 2014-08-29 | Инова Лтд. | METHOD OF SYNCHRONIZATION OF SEISMIC SOURCE |
CN102508292B (en) * | 2011-10-27 | 2013-06-19 | 吉林大学 | Matched scanning method for controllable seismic focus |
CN102749873B (en) * | 2012-07-27 | 2014-09-03 | 吉林大学 | Electromagnetic drive type phased source phase compensation control system and compensation control method |
CN104035128B (en) * | 2013-03-06 | 2016-08-03 | 中国石油集团东方地球物理勘探有限责任公司 | Controlled source pseudo random scanning signal creating method |
CN103323874B (en) * | 2013-06-28 | 2015-09-23 | 吉林大学 | The phase-locked control system of vibroseis |
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2004
- 2004-03-03 CN CN 200410010711 patent/CN1237351C/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101545981B (en) * | 2008-03-28 | 2012-07-18 | 中国石油天然气集团公司 | Method for realizing minimum phase of vibroseis seismic data zero-phase wavelet |
CN102156295A (en) * | 2011-03-30 | 2011-08-17 | 吉林大学 | Vibroseis-based method for rapidly positioning trigger time mark of cable-free seismic detector |
CN102156295B (en) * | 2011-03-30 | 2013-07-03 | 吉林大学 | Vibroseis-based method for rapidly positioning trigger time mark of cable-free seismic detector |
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