System for underwater investigation of underground space and method for underwater investigation of underground space

FIELD: geophysics.

SUBSTANCE: invention relates to geophysics and can be used to investigate underground space under water using seismic exploration by reflected waves. System for investigation of underground space under water using seismic exploration by reflected waves includes multiple sound sources 1 to generate acoustic waves in water, controller 2 for controlling phases of acoustic waves, seismic receiver 3 for receiving reflected acoustic waves; and research ship 4, equipped with sound sources 1. Controller 2 controls phases of sound sources 1, so that acoustic waves generated by corresponding sound sources 1, have phase difference on surface B of bottom of water body. Generation of transverse waves for propagation in soil is controlled.

EFFECT: technical result is increased accuracy of obtained data by enabling control of generation of transverse waves.

8 cl, 20 dwg

 



 

Same patents:

FIELD: physics.

SUBSTANCE: in seismic survey in icy water, streamers are towed behind a vessel under the water surface to avoid collision with ice. GPS readings may not be consistently obtained because the ice prevents a tail buoy with a GPS receiver from trailing from the streamer on the surface Instead, a device is towed on the streamer under the water surface. The absolute position of the streamer is tracked by intermittently bringing the towed device towards the surface so that GPS readings can be obtained. The absolute position of the streamer can then be used in conjunction with compass readings and can correlate various seismic sensor signals obtained along the streamer during the survey. The compass readings can be corrected for declination using declinometer readings, which can be compensated for iron effects from the vessel or other device carrying the declinometer.

EFFECT: high accuracy of survey data.

31 cl, 33 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics and can be used in seismic exploration to detect oil and gas deposits. The invention discloses a method and an apparatus for marine seismic survey using one or more movable marine seismic vibrators. The sweeping function for the vibrator is based on the criterion of allowable degradation and is a nonlinear function which performs frequency sweeping from top downwards. The obtained data can be used directly without cleaning or can be easily cleaned.

EFFECT: high accuracy of survey data.

21 cl, 11 dwg

FIELD: physics, geophysics.

SUBSTANCE: invention relates to geophysics and can be used for sea seismic works. Claimed are seismic streamer and related method of evaluation of the shape of seismic streamer controlled in transverse direction. This seismic streamer is divided into several adjacent sections of seismic streamer by control devices in transverse direction. Heading transducers arranged fore and aft of every section generate the data on heading. Every section is simulated as a rectangular fore and curved fore section. Section shape is evaluated in compliance with this model from the data on heading towards the section.

EFFECT: higher precision of trial data owing to precision of seismic streamer shape evaluation.

19 cl, 2 dwg

FIELD: physics.

SUBSTANCE: disclosed is a small-size bottom seismic module, connected by a hydroacoustic link to a control station and consisting of a sealed housing, a hydrophysical module, a device for detecting geophysical signals, which includes a bottom seismometer, information storage means, a spatial orientation sensor, a radio buoy, a ballast, a ballast release, a release timer, a flash beacon, a radio beacon, an external communication socket and a power supply. The sealed housing has the shape of a hemisphere which is linked to the base of the sealed housing which is in the form of a plate, on the upper diameter of which there are mechanical elements of the ballast release, which are in the form of straps which are linked to the ballast, tightly adjoining the base of the sealed housing on its lower diameter. The means of communicating with the control station are in the form of a single-relay hydroacoustic link. The spatial orientation sensor consists of an electronic 3D compass, three accelerometers and three angular velocity measuring devices, rigidly linked to the bottom seismometer, and the bottom seismometer is in the form of a wideband molecular-electronic sensor.

EFFECT: high reliability of detected seismic signals.

3 dwg

FIELD: physics.

SUBSTANCE: acoustic signal is emitted toward sea bottom. Signal of sound reradiation from water column is received. Gas flares are isolated from receive signal. Gas flare inclination is used to evaluate the stream velocity profile and direction. Density of gas flare sources on sea bottom and methane flow direction in water for every flare are calculated. Obtained data allows the determination of methane concentration in water column in the area of methane discharge.

EFFECT: higher efficiency and accuracy of evaluation.

1 dwg

FIELD: instrumentation.

SUBSTANCE: offered invention relates to measuring equipment and can be used for development and manufacture of oceanological multichannel information and measuring complexes and development of new measuring oceanological channels. The hydrological-optical-chemical complex contains a unit of hydrophysical measuring channels, a central controller, the first and second modems of the electric communication line, a conducting rope with electric and fibre-optical communication lines, a rotating electric transition, an electric winch, an operator workstation, a unit of optical measuring channels, and a unit of normalising controllers is added to it, and each hydrophysical measuring channel through the corresponding normalising controller is connected to the central controller, besides, the first and second multiport optical modems and the rotating optical transition are added, and each optical measuring channel is connected to the corresponding input of the first multiport optical modem connected through the fibre-optic communication line of the conducting rope to the rotating optical transition connected to the second multiport optical modem connected to the operator workstation. The information from the measuring channels of the hydrophysical module is processed by the normalising controllers, and in compact way by the central controller through the multiport modem is transferred to the onboard device of the probe, and also in creation of conditions for development, manufacture, laboratory and natural studies of new optical measuring channels for identification and registration of quantity of a mineral suspended matter and the weighed organic substance in sea water, integration of currently existing measuring oceanologic channels, creation of the combined channel of the electric and fibre-optical communication line between submersible and onboard devices.

EFFECT: integration in a single hydrological-optical-chemical complex of all available measuring channels of oceanological parameters.

1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to hydroacoustic equipment and to the creation of deployment-retrieval devices (DRD) of flexible extended trailing antennas (FETA) on submarines and on surface ships. The invention proposes a DRD structure in which the deployment of the antenna to the stream in case some part of the antenna is wound on a winch, and its other part is arranged in a tubular storage unit, is provided by the creation of excess pressure in the tubular storage unit by means of a centrifugal pump, a sealing device on the end face of the tubular storage unit, which is close to the winch, is made in the form of a cylindrical module of the same inner diameter as the tubular storage unit, which is rigidly and tightly attached to it, and the suction pipeline of the centrifugal pump is made of two branch pipes, one of which is directed outboard and the other one is tightly attached to the inner volume of the tubular storage unit with an additional conical flange coaxial to the tubular storage unit and installed near its fore end face between the conical flange connected to the pressure pipeline and the sealing device of the fore end face of the tubular storage unit, the conical flange of the pressure pipeline is oriented with its constriction to the aft part of the tubular storage unit, and the conical flange of the suction pipeline is oriented with its constriction to the fore part.

EFFECT: increasing the safety of deployment and retrieval of flexible extended trailing antennas, some part of which is wound on a winch of deployment and retrieval devices, and some part is located in the tubular storage unit, without its damages or stops.

1 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to devices for measurement of geophysical parameters in bottom area of seas and oceans. Substance: seismic module comprises a tight body (1), inside of which there is a hard disk drive (5), a unit (7) of a hydroacoustic communication channel, a ballast (2) breaker (8), a timer (9) of the breaker (8) of ballast (2), a flashing beacon (10), a joint (11) of external communication, a source of power supply (12), a hydrophysical module (13), a radio beacon (14), a seismic sensor (15), a unit (20) of spatial orientation. Besides, the unit (20) of spatial orientation comprises an electronic 3D compass, three accelerometers and three meters of angular speeds rigidly coupled with the seismic sensor (15). The seismic detector (15) is made in the form of a wideband molecular-electronic sensor. The tight body (1) is made in the form of a hemisphere with a base in the form of a plate, along the upper diameter of which there are mechanical elements of the ballast (2) breaker (8) installed. Mechanical elements of the ballast (2) breaker (8) are made in the form of slings (3), which are coupled to ballast (2) and tightly adjoin the base of the tight body (1) along its lower diameter. The hydroacoustic communication channel for connection of the seismic module with the dispatching station is made as single-relay.

EFFECT: increased validity of recorded data.

3 dwg

FIELD: transport.

SUBSTANCE: invention relates to ship building, particularly, to surface scientific and research vessels. Scientific and research icebreaking vessel is proposed for carrying out 3D seismic technology exploration irrespectively to ice conditions which vessel has a hull where seismic equipment is located, as well as a shaft for bay cable laying. To move source of acoustic waves untethered unmanned submersible is used which bases on a vessel and is dropped and lifted via separate vertical shaft using running - pulling tool.

EFFECT: improved operational performance of scientific and research vessel for seismic exploration.

3 cl, 1 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics and can be used in marine seismic prospecting. Disclosed is an underwater seismic recording system for reducing noise in seismic signals caused by reflected ghost waves or movement through the water. The system comprises two motion sensors. One sensor has a first response and sensitivity to noise caused by movement of the platform, as well as to acoustic waves. The second sensor has a different structure, which insulates the sensor from acoustic waves such that the response is primarily associated with noise caused by movement. Output data of the responses of the two sensors are combined to eliminate the effect of the noise caused by movement. Upon further combination with a hydrophone signal, noise caused by reflected ghost waves is reduced.

EFFECT: high accuracy of prospecting data.

14 cl, 19 dwg

FIELD: physics.

SUBSTANCE: non-explosive sources of seismic waves are placed on two pivotally connected platforms. The inclination angle of the platforms relative to each other is set depending on natural or artificial relief non-uniformities in the range of ±45° or, when one of the platforms if fixed horizontal to the earth's surface, the inclination angle of the second platform is varied in the range of ±90°, thereby achieving tight adjoining of the platforms to a selected area on the earth's surface, and the non-explosive sources for exciting seismic wave are turned on with a given interval. The value of the inclination angle of the platforms given based on the condition of the location and the location of the platforms, determined using a GLONASS (GPS) navigation system, are transmitted to receiving stations.

EFFECT: high efficiency of emitting transverse seismic waves.

2 cl, 4 dwg

FIELD: physics.

SUBSTANCE: disclosed is a method of emitting transverse seismic waves, which involves generating a dipole effect in the ground for exciting transverse seismic waves using a group of pulsed non-explosive controlled sources spaced apart on the earth's surface. The beginning of emission of each of the sources is shifted in time by a value determined from the delay in signal (wave) propagation from each source to the excitation point. Simultaneously, the propagation speed of the transverse wave is determined from the time of arrival of the reflected wave from each radiation source to the seismic receiver. The wave generation point is shifted sideways relative the centre line of the position of the sources. Excitation of sources in a group is carried out successively in two cycles. In the first excitation cycle, a wave of one direction is generated and a transverse wave of the opposite direction is generated with delay.

EFFECT: high information content of probing pulses during multi-wave seismic survey.

4 cl, 1 dwg

FIELD: physics.

SUBSTANCE: disclosed is a method of exciting seismic waves, involving symmetric arrangement on an area of a group of elementary radiators which are not connected to each other and successive generation of seismic waves by each elementary radiator with time delay relative each other where: ω is the dominant frequency of the elastic wave, i, n is the index number and number of elementary radiators in a group. Symmetric arrangement is carried out on the area of a circle whose radius is not greater than a quarter of the predominant length of the transverse wave.

EFFECT: broader functionalities owing to multiwave seismology.

1 dwg

FIELD: physics.

SUBSTANCE: invention is related to facilities of seismic survey. Support plate in composition of two bases with inertial masses is installed on ground. At least in relation to one base inertial mass is movable and presses base to ground, without prevention of its horizontal motion. Specified base is arranged with the possibility of bending, with mass that is tens and hundreds times less than inertial mass. The latter provides frequency of setup resonance that is higher than frequencies of working range. Contracting force is applied to bases, mechanically stressed condition of soil is created, and unloading is carried out. Two identical horizontally differently directed forces are applied to bases, or contracting force is applied to bases via inertial body with elastic element with realisation of directed horizontal force, which provides radiation with maximum of vertical downward direction. Mass of inertial body and rigidity of damped elastic element are such so that own frequency of inertial body vibrations is less than working range of frequencies.

EFFECT: achievement of high frequencies of working range; increase of quality of impact repetition; possibility of works performance on weak soils; improvement of radiation direction characteristic.

16 cl, 4 dwg

FIELD: physics.

SUBSTANCE: invention is related to facilities of seismic survey. Support plate in composition of two bases with inertial masses is installed on ground. At least in relation to one base inertial mass is movable and presses base to ground, without prevention of its horizontal motion. Specified base is arranged with the possibility of bending, with mass that is tens and hundreds times less than inertial mass. The latter provides frequency of setup resonance that is higher than frequencies of working range. Contracting force is applied to bases, mechanically stressed condition of soil is created, and unloading is carried out. Two identical horizontally differently directed forces are applied to bases, or contracting force is applied to bases via inertial body with elastic element with realisation of directed horizontal force, which provides radiation with maximum of vertical downward direction. Mass of inertial body and rigidity of damped elastic element are such so that own frequency of inertial body vibrations is less than working range of frequencies.

EFFECT: achievement of high frequencies of working range; increase of quality of impact repetition; possibility of works performance on weak soils; improvement of radiation direction characteristic.

16 cl, 4 dwg

FIELD: physics.

SUBSTANCE: disclosed is a method of exciting seismic waves, involving symmetric arrangement on an area of a group of elementary radiators which are not connected to each other and successive generation of seismic waves by each elementary radiator with time delay relative each other where: ω is the dominant frequency of the elastic wave, i, n is the index number and number of elementary radiators in a group. Symmetric arrangement is carried out on the area of a circle whose radius is not greater than a quarter of the predominant length of the transverse wave.

EFFECT: broader functionalities owing to multiwave seismology.

1 dwg

FIELD: physics.

SUBSTANCE: disclosed is a method of emitting transverse seismic waves, which involves generating a dipole effect in the ground for exciting transverse seismic waves using a group of pulsed non-explosive controlled sources spaced apart on the earth's surface. The beginning of emission of each of the sources is shifted in time by a value determined from the delay in signal (wave) propagation from each source to the excitation point. Simultaneously, the propagation speed of the transverse wave is determined from the time of arrival of the reflected wave from each radiation source to the seismic receiver. The wave generation point is shifted sideways relative the centre line of the position of the sources. Excitation of sources in a group is carried out successively in two cycles. In the first excitation cycle, a wave of one direction is generated and a transverse wave of the opposite direction is generated with delay.

EFFECT: high information content of probing pulses during multi-wave seismic survey.

4 cl, 1 dwg

FIELD: physics.

SUBSTANCE: non-explosive sources of seismic waves are placed on two pivotally connected platforms. The inclination angle of the platforms relative to each other is set depending on natural or artificial relief non-uniformities in the range of ±45° or, when one of the platforms if fixed horizontal to the earth's surface, the inclination angle of the second platform is varied in the range of ±90°, thereby achieving tight adjoining of the platforms to a selected area on the earth's surface, and the non-explosive sources for exciting seismic wave are turned on with a given interval. The value of the inclination angle of the platforms given based on the condition of the location and the location of the platforms, determined using a GLONASS (GPS) navigation system, are transmitted to receiving stations.

EFFECT: high efficiency of emitting transverse seismic waves.

2 cl, 4 dwg

FIELD: geophysics.

SUBSTANCE: invention relates to geophysics and can be used to investigate underground space under water using seismic exploration by reflected waves. System for investigation of underground space under water using seismic exploration by reflected waves includes multiple sound sources 1 to generate acoustic waves in water, controller 2 for controlling phases of acoustic waves, seismic receiver 3 for receiving reflected acoustic waves; and research ship 4, equipped with sound sources 1. Controller 2 controls phases of sound sources 1, so that acoustic waves generated by corresponding sound sources 1, have phase difference on surface B of bottom of water body. Generation of transverse waves for propagation in soil is controlled.

EFFECT: technical result is increased accuracy of obtained data by enabling control of generation of transverse waves.

8 cl, 20 dwg

FIELD: seismic prospecting.

SUBSTANCE: method is used for naval seismic prospecting for studying sections of sediments in seas in oceans to find sea hydrocarbon deposits. Method is based upon synergy of synchronous measurements by means of geophones mounted on the sea bottom and in towed scythes. Autonomous bottom seismic stations are used as bottom receivers mounted in specific areas. Far and nearer areas seismic towed scythes are used as multichannel receivers. Kinematical and dynamic parameters of the whole set of reflected, refracted, head longitudinal and lateral waves after being synchronously registered by autonomous bottom seismic stations and far and nearer area seismic scythes, are used for data interpretation. The whole set of data is subject to complex processing at synchronous registration along the whole wave field.

EFFECT: improved truth of results of measurements.

5 cl, 1 dwg

FIELD: seismic prospecting.

SUBSTANCE: device comprises partially submerged vessel, source of linear mechanical force whose first movable member is joined to the weight which can move upward and second one is joined with the striker-emitter. The bottom of the vessel is provided with port. The housing, which can be a part of the vessel, is secured to the bottom over periphery of the port. The housing received the submerged striker-emitter which is mounted above the port and can move downward. The striker is coupled with the weight through flexible members. The weight bears on the housing.

EFFECT: enhanced efficiency and reduced service expenses.

8 dwg

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