SU1636821A1 - Apparatus for seismoacoustic investigations in water areas - Google Patents

Abstract

The invention relates to geophysical studies in the waters, in particular for the study of the structure and properties of bottom sediments by a method combining continuous acoustic microanalyzing with multichannel sounding. The aim of the invention is to increase the information content and noise immunity of research while simultaneously improving the geological profile / through operational logging and adjusting sounding parameters that ensure that all seismograms are assigned to a section of a profile that does not exceed the size of the first Fresel zone, and, accordingly, the statistical summation of seismograms. The device contains a multichannel receiving device (spit), a multichannel digital, this moralized station, an acoustic / professional logger, a controlled time interval generator, a time stamp generator, a sietch 1k pulse rate, a frequency divider, a coincidence circuit, a computer gheyu programmer, a bee seismogram programmer with sounding. The improvement of the seismic sampling, the geologist of the i43Ci OMy section, is carried out by simultaneously recording an oeoactive flap on the echogram and the time of the start of sounding on the tycoon: 2 IU, SL vv (er2

Description

The invention relates to geophysical studies in the waters, in particular, to study the structure and properties of bottom sediments by a method combining continuous seismoacoustic profiling with multichannel sounding.

The aim of the invention is to increase the information content and noise immunity of research while improving the geological profile through operational control and adjustment of sounding parameters that ensure that all seismograms are assigned to a profile section not exceeding the size of the first Fresnel zone and, accordingly, the statistical summation of seismograms

FIG. 1 shows a structural diagram of a device for seismic acoustic surveys in water areas; On Fmg 7 - timing diagrams for the devices that work.

The device contains a multichannel receiving seismoacoustic device 1 (spit), a multichannel digital seismic station 2 seismoacoustic profiler 3, which includes radiation and reception devices of a seismic acoustic signal, a programmer of the radiation frequency, a recorder, a controlled generator of 4 time intervals, a generator 5

time stamps, programmable frequency divider b, pulse counter 7, coincidence circuit 8, key circuit 9, programmer 10 of the number of seismograms in sounding.

The output of the generator 5 time stamps is connected to the input 11 of the seismic station, the output of the controlled generator 4 time intervals is connected to the input 12 of the seismic station and the input of the frequency divider 6, the output of which is connected to the input 13 of the operational mark of the profilograph, the output of the programmer 10 is connected to the input 14 of the circuit 8 coincidence, the input 15 of which is connected to the input 16 of the seismic station and the output of the pulse counter 7, the zero input of which is connected to the output 17 of the seismic station, and the counting input is connected to the input 18 of the seismic station and the output of the key circuit 9. stroke key circuit 9 connected to the output of matching circuit 8 and the signal input - yield 19 profiler. The output 20 of the device 1 is connected to the information input of the seismic survey station 2.

In Fig. 2, the following is indicated: a signal 21 of the moment of emission at the output 19 of the profilograph 3; signal 22 at the output of the controlled generator of time intervals 4; signal 23 at output 19 of seismic station 2; signal 24 at the output of coincidence circuit 8; signal 25 at the output of key circuit 9; the signal 26, providing the time interval of the counting of the counter 7 pulses; a signal 27 during which the seismic station 2 is in the standby mode; signal 28, during which the seismic station is in the preparation mode (label recording); signal 29, during which the seismic station 2 is in the recording mode of seismic acoustic data.

The device works as follows.

The seismoacoustic profilograph 3 with a period set on the programmer included in its composition (for example, after 1 s) emits seismoacoustic impulses propagating in the water mass.

A portion of the pulse energy is reflected from the interfaces, returns to the receiver of the profilograph 3, and is registered on the graphic recorder. Since the radiation is produced frequently (after 1–2 m profile), the echogram represents a fairly detailed display of the geological structure of a given area on a time scale.

The reflected signals also affect the multichannel receiving device 1, but they are not recorded.

as the seismic station is in standby mode. In this mode, at its output 17, there is a signal 23 (Fig. 2), which resets and blocks the pulse counter 7. Accordingly, the codes at the inputs of the comparison circuit 8 do not coincide, and at its output there is a signal 24 allowing the key circuit 9 to pass pulses arriving at its input. On the programmer 10, the numbers of seismograms set the number, according to a priori representations, corresponding to a certain optimum (for example, 5), and on a controlled generator of 4 time intervals - a certain time interval (for example, 3 minutes).

5 With each radiation at output 19 of profilograph 3, a signal 21 appears, coinciding in time with the moment of radiation.

After a predetermined time interval has elapsed, the controlled time interval generator 4 generates the next signal 22 arriving at the input 12 of the seismic station 2 and transferring it from the standby mode to the information recording mode. In this case, the tape drive (NML) is turned on, service data, including the current time code generated by the generator of 5 time stamps, is recorded in the buffer registers;

0 magnetic tape sounding labels. The preparation mode corresponds to the signals 28. Simultaneously through the frequency divider 6, an operational mark is recorded on the echograph echogram.

5 Upon completion of the recording of the label, the signal 23 at the output 17 disappears, and the seismic station 2 either immediately or upon the arrival of the next impulse of the time mark at the input 18 switches to the

0 records of seismic acoustic information from the multichannel receiving device 1, and the pulse counter 7 starts counting signals 25, arriving at its counting input through an open key circuit 9. Recording mode

5 seismic information correspond to the signals 29. A pulse number code generated by the pulse counter 7 is recorded simultaneously with the seismoacoustic information.

0

This allows recording all the seismograms of the series, without any intervals or labels between them, to distinguish them from one another when processing by the number recorded on the NML service tracks. In this case, the moment of changing the number exactly coincides in time with the moment of radiation, i.e. can serve as a starting point of time on each seismogram when they are summed.

The recording of all sounding seismograms (without intervals between them) makes it possible to shorten the time of sounding and, thus, to obtain all the seismograms in the area not exceeding the dimensions of the first Fresnel zone.

When the code at the output of pulse counter 7 coincides with the code set on the programmer 10 of the number of seismograms, signal 24 disappears at the output of coincidence circuit 8, allowing key circuit 9 to pass pulses to the input of pulse counter 7 and to input 18 of seismic station 2.

Seismic station 2 for some time corresponding to that set on its own programmer records seismic acoustic information and then goes into standby mode. At the same time, at output 17, a signal 23 appears, zeroing and blocking the pulse counter 7 before the arrival of the next pulse 22 generated by the generator 4 time intervals, and the cycle of operation of the device is repeated.

Analyzing the structure of the geological section by the echogram recorded by the profilograph 3, the pulse counter 7 counts the number of gathering data in the sounding and the interval between soundings controlled by the generator 4 time intervals.

Claims (1)

Claims of the Invention A device for seismic acoustic surveys in water areas containing a multichannel receiver, a multichannel digital seismic survey station, a seismoacoustic profilograph consisting of a seismic signal receiving and receiving device, a radiation frequency programming device and an echogram recording device. characterized in that, in order to increase the information content and noise immunity of research while improving the geological profile, the device additionally introduces a controlled time interval generator, time stamp generator, pulse counter, programmer, coincidence circuit, key circuit and frequency divider, with In this case, the output of the time stamp generator is connected to the first input of the seismic survey station, the output of the controlled time interval generator is connected to the second input of the seismic survey station and the input of the frequency divider, the output of which is connected to the operational mark input of the profilograph, the output of the pulse counter is connected to the third input of the seismic survey station and the first input of the coincidence circuit, the second input of which is connected to the output of the programmer and the control input of the key circuit which is connected to the output of the moment of emission of the profilograph, the output to the counting input of the pulse counter and the fourth input of the seismic survey station, and the zero input of the pulse counter is connected to the first the course of the seismic survey station. L-JLJLJLJLJL4 Lii i i i i t i I l four i 11  one s