SU760011A1 - Device for control of seismic wave source - Google Patents

Description

The invention relates to the field of seismic exploration, in particular to control systems for pulsed and vibratory sources of seismic waves.

A device for controlling a source of seismic waves, containing a source of command pulses (seismic station), electronic switches with two stable states, a constant frequency generator, a block K, is known.

installation of a given number, pulse counters, the executive body of the seismic wave generator, the unit for forming the mark of the moment of seismic wave formation, the unit for combining signals [1]. The seismic wave source control device is designed to control synchronous accumulation with overwriting information in the absence of a signal of the 20 moment mark.

A disadvantage of this device is the inability to receive commands. signals that change programmatically according to a given law. 25

A device for controlling a source of seismic waves is known, which contains a source of command pulses (seismic station), electronic switches, a constant frequency generator, a circuit 30

2

matches, executive body, block of seismic wave formation mark, block for setting a given number. The device allows you to synchronize several sources with different technological constants of operation. A disadvantage of this device is also the inability to receive command signals, programmatically changing But given a law.

The closest in technical essence to the present invention is a device for controlling a source of seismic waves, comprising a source of command pulses, a first electronic key, a constant frequency generator, a unit for setting a given number, a second electronic key, a pulse counter, an executive body of the seismic wave generator seismic waves connected in series, and the feedback line from the output of the set unit: the number on the first electronic key £ s]. The device allows you to synchronize multiple sources by grouping with synchronous accumulation.

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760011

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The disadvantage of this device is its limited use in other seismic methods (directional blast method, "Seiskod" method) for controlling sources of seismic waves. ., -, .--,

The aim of the present invention is to expand the functional capabilities, i.e., creating a seismic source control device using grouping methods, a directional explosion and the Seiskod method> the use of which in different seismic areas makes it possible to obtain better seismic data.

The goal is achieved by the fact that the device includes code comparison circuits and a reversible ring- ^: target counter, with the “outputs of the reversible ring counter connected to the inputs” of the installation unit Set number, the outputs of which are connected; The codes to the first inputs of the code comparison circuit, and the corresponding second inputs of the code comparison circuit are connected to the outputs of the pulse counter, the output

_H of the code comparison circuit is connected with a second input of a pulse counter,

the first input of which is connected to the output of the constant frequency generator, the input of the reversible ring counter, via the second electronic key to the input of the first electronic switch, the input of which through the second input to the third electronic key is connected to the output of the Seismic wave formation block.

FIG. 1 is a block diagram of a source control device, seismic waves; in fig. 2 is a graph explaining the operation of the device. .

The device contains a source of command pulses 1, the first electronic key 2, a constant frequency generator 3, the installation unit of a given number 4, the second electronic key 5, the pulse counter 6, the executive body 7, the block of the seismic wave 8 formation moment block, code comparison 9, reversing ring counter 10.

When using the method of directional explosion, it is necessary to obtain directional; seismic wave, and the “Seiskod” method - pulsed seismic effects according to a certain law, i.e. a discrete delay of the command pulse is required by a given law. '"

FIG. 2 is a graph explaining the operation of the proposed device. The command impulses are plotted along the "X" axis, and the command impulse delay, expressed by the number of clock pulses in the binary code, along the "Y" axis. The essence of the discrete delay of the command pulse according to a given law is that

ten

'that at the inputs of the code comparison scheme · codes are formed that correspond to this law.

So, for the first pulse, the delay is equal to 'number 2 (code 0010) multiplied by the duration of the clock pulse. The operation of the device is considered .in the example of the implementation of the Directional explosion method In the initial state from the source of command impulses 1. (Seismic stations) no signals are received, the first electronic

• key 2 (trigger) prohibits the supply of pulses of constant frequency from an operating generator 3 to the pulse counter 6. Pulse counter 6 na15 is in the zero state, the zero input of counter 6 is connected to the output of the code comparison circuit 9. The first trigger of the ring reversible counter .10 is in eDinich20; states, and all the other trig. hera at zero. The second electronic key 5. commutes' the output of the comparison circuit of codes 9 and the second input of the electronic key 2. The entrances of the block ’statutes-.

„„ Ki of the given number 4 are connected to the outputs of the ring reversible 'counter 10 so that “the input of the code comparison scheme 9. is given a code corresponding to the first value, i.e. the number 2 (code 0010) (see Fig. 2 ) .Ur30 block

The set of a given number 4 is an encoder. '

Command impulse from source 1

-ac (seismic station) translates trigger 2 into one state and pulses of constant -the frequencies from generator 3 arrive at the input of counter 6. When reached: the same number in counter 6 equal to the number supplied to the circuit inputs

40 comparison 'of codes 9 from the installation unit of a given number 4, the comparison circuit, codes 9 generates a pulse, which puts the counter 6 in the zero state, closes the first electronic ·

45 key 2, prohibiting the supply of pulses to the input of counter 6, and the ring reversible counter 10 switches to the second state, and at the same time the same impulse is fed to the input of the executing authority 7. Thus, the pulse counter b zeroed, the second electronic key 2 prohibited the impulses constant frequency generator 3, and ring reversible

__ counter 10 was connected to the inputs of the block ^{33 by} setting the given number 4 so

what's at the inputs of the code comparison circuit

9 with the output of the installation unit given the number 4, a code is supplied that is equal to

the value of the delay of the second pulse,

60 i.e. 5 (0101) (see Fig. 2). Consequently, when the second command pulse arrives from the seismic station, the pulse will be delayed for a time equal to the code of the number corresponding to the second value of the function, i.e. 5, clever.

760011

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for the duration of one clock cycle of the constant frequency generator.

Thus, each next command impulse will implement the specified law of the impact of the seismic source. After a certain number of impacts, cycle 5 may be repeated.

The proposed control device source of seismic waves allows you to work also by the method of grouping with synchronous accumulation. ten

In the initial state, there are no signals from the source of command pulses 1 (from the seismic station), the first electronic key 2 (trigger) prohibits the supply of pulses of a constant frequency 15 from an operating generator 3 to the pulse counter 6. Pulse counter 6 is in the zero state, the zero setting input

6 is connected to the output of the comparison ed • codes 9. The first trigger ring

reversible counter 10 is in a single state, and all other triggers - in zero. The second electronic key 5 commutes the output __ of the seismic wave 8 generation block and the second input of the electrode key 2, the inputs of the installation unit of the specified number 4 are connected to the outputs of the ring reversing meter 10, which is input to the circuit 30; .: corresponding to the first value, the value of which ⁶ is greater than the constant response of the seismic source. 35

The command impulse from source 1 (seismic station) translates trigger 2 into one state and constant frequency pulses from generator 3 arrive at the input of counter 6. When 40 reaches the number in counter b, equal to the number fed to the circuit inputs

.. comparison of codes 9 from the installation unit of a given number 4, the comparison circuit of codes 9 generates a pulse, which 45 resets counter 6. After resetting, counter 6 continues to count, since the pulses from the constant frequency generator 3 continue to flow to the input of counter 6, the pulse of the circuit - U neniya codes is input to a reversible ring counter 10, connecting a second state, which codes for the input of the comparison circuit 9 the setting unit sets a given number _ Nogo code equal to the value of ^'55 to the first state, and to the input of IP olnitelnogo body. After actuation of the executive body

7 block of the moment of formation

seismic wave 8 gives impulse, ¢ 6

which is through the second electronic

key 5 is fed to the input of the first

The electronic key 2, which is triggered and prohibits

from constant frequency generator 3 45

at the input of the pulse counter 6. The pulse counter 6 stops counting. and remember a number equal to the constant response of the seismic wave source. When a second pulse is applied, the pulse counter will start counting not from zero, but from the number recorded in pulse counter 6 to a code value whose values are constant with each next command signal and more than the constant triggering of the seismic source. Thus, the proposed device control source of seismic waves allows you to synchronize the sources of seismic waves at different constant response for each of them. ·,. '. ·

The use of this device for controlling the source of seismic waves increases the efficiency and quality of seismic work on the profile, for oil exploration, gas and other minerals.

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Claims (1)

Claim A seismic source control unit containing a source of command pulses, a first electronic switch, a generator of fixed frequency, a unit for setting a given number, a second electronic switch, • a pulse counter, an executive unit of the generator of seismic waves and a unit for marking the moment of formation of seismic waves, connected together . researcher, and the feedback line from the output of the installation unit of a given number to the first electronic key, that is, in order to expand its functionality, it introduced schemes, code comparisons and reversible a ring counter, the outputs of the reversible ring counter are connected to the inputs of a unit for setting a given number, the outputs of which are connected to the first inputs of the code comparison circuit, and the corresponding second inputs of the code comparison circuit 'are connected to the outputs of the pulse counter, the output of the comparison circuit is They are connected to the second pulse counter input, the first input of which is connected to the output of the constant frequency generator, the input of the reversible ring counter, and through the second electronic key to the input of the first electronic key, whose input is connected to the output of the second electronic key through the second input of the second electronic key seismic wave formation.