SU859979A1 - Method and device for recording seismic signals - Google Patents

Description

/ one ., ..

The invention relates to seismic exploration and is intended for the detection of seismic signals.

A known method of recording seismic vibrations, which is characterized by the following sequence of operations: divide the recorded signal into two canes, convert the recorded signal in the first kangsha into a voltage corresponding to one of the recording types, and the waveform is changed, for example, extruded, modulated by a high frequency or orpai, signals are generated by the second channel, which modulate the intensity of the light flux acting on the recording medium 1 |

However, the separation of the seismic signal aaa two channels leads to the phase shift of the signals of one channel from another to another. This causes additional inaccuracies in the construction of seismic sections and complicates the hardware implementation of the recording method.

A device for recording seismic signals is known, in which the formation of the image is carried out by a special recorder of the recording type t2l.

A significant disadvantage of this device is that the exposure time of the recording element to the photosensitive recording medium is part of the period of the high-frequency sawtooth pulse. For another part of this period, writing down an element makes a movement that does not participate in the formation

10 images on the carrier, which causes additional time expenditure for idle movement of the recording element, in this case the optical energy of radiation of a CRT microfor is not used. Obtaining the required optical density of the image leads to an increase in the recording time of seismic signals, which generally reduces the performance of the recording device.

The closest technical solution to the proposed is a recording of seismic signals and a device for its implementation,

25 based on the conversion of a seismic signal into a voltage that controls the position of the recording element of the sBttMCH photosensitive motor, in which the ph transform separates the seismic signal with respect to yule values into two parts and fills the positive part of the seismic signal with an insonic frequency signal. The device for carrying out the method contains two amplifiers — a limiting generator of sawtooth pulses, a comparator, an adder and an optical recording unit, the inputs of both amplifiers of Limiters being connected to the source of seismic signals. The disadvantage of the method is insufficient dynamic expressiveness of the recording. A significant drawback of the device is that the time of the impact of the recording element on the photosensitive recording medium is part of the period of the sawtooth pulse. For another part of this period, the recording element performs a movement that does not participate in the formation of the image on the media. his idle perementisenne. With Ztom, the recording rate of the seismic signal on the Carrier, due to the presence of: idling and incomplete use of the optical energy of the emission of the CRT phosphor, is low. This device is rather complicated in its structure, since the control of a combined recording is carried out through two channels: deviations and brightness of a CRT, which reduces its reliability. The purpose of the invention is to improve the visualization and increase the recording speed. The goal is achieved by the fact that in the method of recording seismic information based on the transformation of a seismic signal into a voltage that controls the position of the recording element on the photosensitive recording medium, and its extunion, in which the seismic signal is divided relative to zero values into two parts and fill the positive part of the transient signal with its low-frequency signal, change the amplitude of the high-frequency signal and, according to the instantaneous values of the positive signal The second part of the seismic signal, and the frequency inversely proportional to these values, summarizes the positive and negative portions of the seismic signal and is obtained ("the signal is controlled by the optical sensitivity of the NZO (the signal on the photosensitive recording medium. In the device for the implementation of yes | the second method contains two amplification limiting devices, a sawtooth pulse generator, a comparator, an adder and an optical recording unit, the inputs of both limiting amplifiers being connected to the seismic source, output The first limiting amplifier is connected to the first input of the comparator, the output of the second limiting amplifier is connected to the first input of the adder, the second inputs of the comparator and the adder are combined and connected to the output of the sawtooth generator, the input of which is connected to the outcome of the comparator, and the sukotats is connected to the optical amplifier records Filling the positive part of the seismic signal with high-frequency signals, the amplitude values of which are equal to the instantaneous values of the positive part of the seismic signal, and the frequency is inversely proportional to these values, contributes to the fact that phase transitions of signals through zero and extreme values are traced in the image of the signals. This enhances the dynamic expressiveness of seismic sections, as well as the accuracy and reliability of the recording. Introducing new connections between the elements of the proposed device makes it possible to completely eliminate idle movement of the recording element on the carrier, fully utilize the CRT radiation energy of the recording and, thereby, increase the speed recording seismic signals onto a carrier, control the recording process on a single channel, i.e., simplify the device circuit and, accordingly, increase the reliability of its operation. The method of recording seismic signals is characterized by the following sequence of operations. The seismic signal with respect to zero values is divided into two parts: the positive sh and negative values of the seismic signal. The polar part of the seismic signal is filled with a high-frequency signal of a pi-khbrazny form, while the values of the array of saw-tooth pulses are equal to the instantaneous values of the positive part of the seismic signal, and the saw-tooth pulses are inversely proportional to this value of 4. ; signal 6 with a negative part of it; control noj 4eHHbO4 by the signal FALSE .birm position is captured; 9Leuser and photosensitive nosi-gel of recording and affect recording by 10mm Lemen t0m per photosensitive medium of record. Density (image area of the B1 cilrccina seis image obtained with MTHO eftiftiM / Values of the positive signal, it is the maximum in the seismic junction transition sections and in the alarms of cysts and inpidiated men and 10% of the patients in the group. Fig. 1 is a drawing showing a diagram of a device implementing a recording method. The device contains two limiter amplifiers 1 and 2, a comparator 3, a generator 4 of high-frequency sawtooth ICs, su4ator 5, deflection amplifier 6, light beam deflection element 7, for example, an electron beam tube (CRT), Lens 8, and a sensitive recording medium 9 mounted on the drum. Seiskscheck's analog signal 10 from a magnetic tape or digital tax converter is fed to the inputs of Amplifier Limiters 1 and 2. Amp Limiter 1 cuts the negative part of the seismic signal, and Amp Limiter 2 is positive. The signal 11 from the output of the amplifier-limiter 1 serves to the first input of the comparator 3. The second input of the comparator 3 is connected to the output of the generator 4 high-frequency sawtooth pulses. The output of the compupapa 3 is connected to the input of the generator 4. At the moments of coincidence of the magnitudes of the amplitudes of the sawtooth pulses with the instantaneous values of the positive part of the seismic signal at the output of the comparator 3, pulses 12 are rectangular in shape, the input frequency of the generator 4, whose frequency is inversely proportional to instantaneous amplitude values of the recorded signals. Due to this, the filling of the positive part of the seismic signal with sawtooth pulses occurs with different frequencies. The frequency of sawtooth pulses with a small amplitude of the seismic signal is higher than with a large amplitude; e. Allshield pilo & razyh {units of pulses equal instantaneous values of the positive part of the seismic signal. Signal formation: 13 in oscillator 4 can be isp. (Φ & bc, for example, a change in the charge of a capacitor installed between the input and output of generator a is proportional to the instantaneous value of the positive part of the seismic signal. In this case, the constant of the charge circuit and The discharge of the airflow controller, regardless of the magnitudes of the negative values of the positive part of its signaling system, remains constant. The signal 13 from the generator 4 is fed by the first all cywiatopa 5, its second input serves the negative part of the seismic signal 14 with an amplifier-reader 2. At the output of the adder 5, cHrHaJfi 15 of complex shape is obtained, which is controlled by the deflection of a 3-record element, for example, a beam of light emitted by a CRT phosphor 7. The beam of light enters the photosensitive recording carrier 9, fixed on the rotating drum, and acts on the carrier. In seismic sections, recorded by the proposed method, small signals, as well as sections of the phase transition through zero, become more contrast в and on the general background of the section, which contributes more vnszhu vschtseleniyu regular molecular weak signgshov in the background. At the same time, the information; zhivnost in the record is not lost in comparison with the known. Hardware (the legalization of the proposed method for recording seismic signals is easier compared to the known and safer in operation, since only one channel is required for recording signals, while eliminating inaccuracies in the image of signals characteristic of the known one because of the occurrence of phase shifts of signals of one channel with respect to another. In general, the proposed QJIOCOU recording contributes to improving the geological efficiency of digital methods for processing seismic data. : signals that are based on the transformation of a seismic signal into a voltage, controlled by its position of the recording element of the light-sensitive recording medium, and exposure, in which, during the conversion, the seismic signal is divided into two parts relative to zero and filled the positive part of the seismic signal by high-frequency signal, in order to improve the visualization of the recording, they change the amplitude of the high-frequency signal in accordance with the instantaneous values of the field The main part of the seismic signal, and the frequency inversely proportional to these values, are summed up by the positive and negative parts of the seismic signal and the received signal controls the optical density of the image of the signals on the photosensitive medium. 2. The device for carrying out the method according to claim 1, comprising two amplifier limiters, a sawtooth pulse generator, a comparator, an adder and an optical recording unit, with the input of both limiting amplifiers connected to the source of seismic signals, which Increase the write speed and increase the di-. PERSONAL PERFORMANCE, EXIT

the first amplifier limiter is connected to the first input of the comparator, the output of the second amplifier limiter is connected to the first input of the adder, the second inputs of the comparator and the adder are connected and connected to the output of the sawtooth generator, which is connected to the output of the comparator, and the adder is connected to optical recording unit.

Sources of information taken into account in the examination

1, USSR Author's Certificate 428330, cl. G 01 V 1/28, 1971.

2, US Patent 3,349,407 ,. cl. 346-110, publ. 1967.

3, US Patent I 3,611,406,

cl. 346-110, publ. 1971 (prototype)

"E 111 DM

jj

77777

Claims (2)

Claim 1. A method of recording se: 'waveforms based on the conversion of the seismic signal to voltage, controlling the position of the recording element on a light-sensitive recording device, and exposure, in which when converting the seismic signal is divided into two parts relative to zero values and filled in positive part of the seismic signal by a high-frequency signal, with the fact that, in order to improve recording visualization, the amplitude of the high-frequency signal is changed in accordance with instant values of the positive part of the seismic signal, and the frequency is inversely proportional to these values, summarize the positive and negative parts of the seismic signal and the received signal is controlled by the optical image density of the signals on a photosensitive recording medium. 2. A device for implementing the method according to π. 1, comprising two limiter amplifiers, a sawtooth pulse generator, a comparator, an adder, and an optical recording unit, the inputs of both limiter amplifiers being connected to a source of seismic signals, characterized in that, in order to increase the recording speed and increase dynamic expressiveness, the output of the first amplifier-limiter is connected to the first input of the comparator, the output of the second amplifier-limiter is connected to the first input of the adder, the second inputs of the comparator and adder are combined and connected to the output of • sawtooth pulses, the input of which is • connected to the output of the comparator, and the adder is connected to the optical recording unit.