Method for seismic survey on water bodies and device therefor

FIELD: geophysics.

SUBSTANCE: invention relates to seismic survey and are intended to determine structure and properties of geologic section under bottom of water bodies. Method for marine seismic survey includes excitation of vibrations by a source and recording of reflected waves with multichannel receiving device mounted with inclination relative to water surface, displacing along profile oscillation source and a multichannel receiving device by means of ship, data processing. Multichannel receiving device is made in form of a seismic cable consisting of a set of receivers of pressure in form of hydrophones with pitch between them from beginning of seismic cable to its end. Excitation of vibrations is carried out with three sources operating simultaneously or in a given order: pneumatic source in form of an air gun, sparker and boomer. Airgun excites low-frequency oscillations in range of 50-250 Hz, towed at a depth of not more than 0.25 of predominant length of excited oscillations, at distance of 10-20 m from first channel of seismic cable. Sparker excites medium-frequency vibrations in range 200-2,000 Hz and is located between air gun and boomer. Boomer excites high-frequency oscillations in range of 500-5,000 Hz, towed at a depth of not more than 0.25 of predominant length of excited oscillations, on possible minimum distance from first channel of seismic cable. Received seismic oblique data are transmitted on a recording device on vessel for mathematical processing. Device for marine seismic survey includes vessel-pusher, a seismic station, multichannel receiver made in form of a seismic cable in housing, and a system of three series-arranged sources for exciting elastic vibrations in different frequency ranges: pneumatic source in form of an airgun, sparker and boomer.

EFFECT: technical result is increase of resolution of seismic survey on water bodies.

2 cl, 1 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: 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

FIELD: geophysics.

SUBSTANCE: sonic signals are irradiated, reflected signals are received and processed and depth is determined at different inclines of radiation. Error in location of signal's reflection is determined as well. When finding error the vessel random rotation density distribution is determined additionally from polar distance density distribution, longitude and angle of turn of vessel around axis.

EFFECT: improved precision of measurements.

FIELD: geophysics, possible utilization for controlling seismic processes.

SUBSTANCE: method for registration of seismic signals on defined area of seawater includes positioning on sea bottom of groups of seismic indicators, connected by communication line to dispatching station for receiving and processing signals, and fixed at sea bottom. Additionally for registration of seismic signals hydrophone is utilized. Determining of direction of seismic indicators and hydrophone is performed by using orientation block. Groups of seismic indicators, held at sea bottom by means of load-anchor, are positioned with forming of fan zone in azimuth direction and connected to sea dispatching station for receiving and processing signals by hydro-acoustic communication line. Also proposed is device for registration of seismic signals at defined area of seawater, including body with bottom and rigidity ribs, internal volume of which is split onto sectors with seismic indicators positioned therein. Device also has slings, mechanically connected to detaching device, including an electrode. In upper and lower parts of body apertures are made. In upper aperture hydro-acoustic antenna, hydrophone, detaching device are mounted, and in lower aperture - flash light diode, hydro-acoustic antenna and hydrophone, connected through input/output device for signals to information-measuring module, positioned in the body and consisting of registration block, orientation block, including indicators of magnetic field, inclination and azimuth, seismic indicators block, positioned on universal-joint suspension, block of seismic indicators filters.

EFFECT: expanded controllable zone space.

2 cl, 5 dwg

FIELD: geophysics, possible use for performing monitoring at seas and oceans.

SUBSTANCE: method for determining depths of body of water includes emitting hydro-acoustic signals by phase hydro-locator for side observation and reflected signal is received in two points positioned along vertical line at given distance. Measurement of delay time of cophased signals along vertical line, including those reflected from even surface of bottom, is performed along each calculated direction. On basis of produced data directions of arrival of cophased signals are determined and sea soil is recognized. Additionally measured is alteration of sound speed directly at horizon of antenna, on basis of values of which correcting signals are introduced. Inclination angle of antennae carrier is determined, linear and angular speeds and accelerations directly on body of antennae. Correction for temporal code determined during measurements is introduced. Recognition of sea soil is performed by methods of clusterization and numeric analysis. Device for realization of aforementioned method includes antennae, transmitting block, receiving-measuring block, controlling block, computing unit, registration device, correction device, information timing device, and also a block of indicators for measuring linear and angular speeds and accelerations.

EFFECT: higher trustworthiness of depths calculation and recognition of soil.

2 cl, 4 dwg

FIELD: geophysics, possible use for controlling seismic processes of sea.

SUBSTANCE: naval autonomous ground seismic station has deepwater self-surfacing geophysical equipment carrier and onboard computing module, mounted onboard the ship. Geophysical equipment carrier includes, positioned in hermetic spherical container, consisting of two semi-spheres, between which compacting rubber ring is positioned: registration block, orientation determining block, made in form of indicators of inclination and azimuth, synchronization block, made in form of timer, synchronized with chronometer, hydro-acoustic transmitter-receiver block, device for controlling release, connected to timer and onboard computing module, power block; mounted outside the hermetic container - hydro-acoustic indicator in form of hydrophone, hydro-acoustic antenna, device for planting and lifting geophysical equipment carrier from bottom soil, made in form of ballast anchor and held by means of release, made in form of electro-chemical release, means for finding surfaced geophysical equipment carrier, made in form of flashing beacon. Registration block includes three-component seismic-receiving module and device for accumulating measuring information. hydro-acoustic antenna through hermetic socket is connected to inputs of hydro-acoustic transmitter-receiver block and device for controlling aforementioned release. Ballast anchor is made with semi-spherical recess for placing container held by means of release. Onboard computing module contains block for taking digital information from measuring information accumulating device, controlling block, block for hydro-acoustic communication with carrier of geophysical equipment, time synchronization device, display device. Ballast anchor is made bucket-shaped of reinforced frame filled with concrete, in semi-spherical recess of which float is positioned provided with halyard. One of inclination-azimuth indicators is mounted on the body of geophysical equipment. Additionally inserted is block of geo-background filters.

EFFECT: expanded functional capabilities of device.

1 cl, 7 dwg

FIELD: naval seismic prospecting.

SUBSTANCE: method can be used for building seismic pictures. Method is based upon placement of registration aids in water medium, in reception, irradiation and registration of waves by means of groups of hydrophone and geophone-type seismic detectors according to technique of multiple overlaps or similar probing, according to measurement of three-dimensional sonic speed fields as well as temperature, density, saltiness and flowing speed field followed by subsequent restoration of characteristics of medium based on measurements of signal delays. Registration aids are disposed at depths being equal to 1/3 and 2/3 average maximal depth to form a triangle at vertexes of which triangle the registration aids are placed. Pseudorandom signals are formed by means of registration aids. Signals are radiated synchronously within 2000-5000 Hz range. Circulation of field along closed beam trajectories is determined by comparing direct measurement of time difference along the circle in mutually opposite directions along different beams. Definition of mutual disposition of registration aids relatively each other is made after reconstruction of sound speed field on the base of signal delay along deep-water beam. To determine mutual disposition the difference received for any group of registration aids is used.

EFFECT: improved truth of seismic prospecting; improved attention to details.

2 cl, 2 dwg

FIELD: hydrometeorology.

SUBSTANCE: method comprises setting the recording devices on the load-bearing members that are mounted on the sea bottom and in the water column, and interconnected through the hydroacoustic channel are mounted to define fan zones over the azimuth and row zones. The depth of the drift of the float is equal to the half of the mean distance over the vertical between the bottom load bearings of the multi-channel recording devices and drifting devices. The pressure and temperature signals are recorded simultaneously. The signals recorded are set to the control stations. The signals are processed, and the models of the objects to be studied are constructed. The model are constructed with the use of totality of the signals.

EFFECT: expanded functional capabilities.

FIELD: geophysics.

SUBSTANCE: at least one receiver 14 is tugged behind moving seismic prospecting vessel 10. Method is base upon excitation of acoustic intensive wave at seismic source 16 and upon registration of time t2 of coming of reflection of acoustic intensive wave at one receiver. Distance x between source and one detector is measured. Time increment normal velocity V is estimated for acoustic energy and velocity Vv of seismic prospecting vessel. Then corrected time t1 of coming of reflection of acoustic intensive wave is determined due to introduction of time correction into registered time t2 of coming of reflection. Time correction has to the function of distance x, time increment normal velocity V and speed Vv of seismic prospecting vessel. Method can be applied to big amount of receivers independently on whether the receivers are disposed in data collection system with separate detector or they are tightly connected to form a group of receivers.

EFFECT: improved precision of results.

9 cl, 9 dwg

FIELD: underwater geo-acoustics, possible use for providing warning about earthquake and tsunami by enabling appropriate signaling systems.

SUBSTANCE: system contains hermetic body, and also optic-electronic indicator of previously given limit value of pendulum deviation. To lower part of body receiver of seismic oscillations is connected, and to upper one - pendulum with distributed mass. Optic-electronic sensor is made in form of signal and supporting filament coils, optically connected through source of coherent light and photo-receiver into interferometer. Signal and supporting filament coils are positioned on the body mounted on sea bottom, respectively on or outside the trajectory of deviation of pendulum from balanced position, while source of coherent light and photo-detector are positioned at above-water control and registration center. Optic-electronic indicator includes optically synchronized source of coherent light and photo-detector. Photo-detector is connected by output through serially connected photo-current amplifier and frequency meter to alarm signaler. Alarm signaler is made in form of transmitter, satellite relay and ground station. Transmitter is made in form of, connected serially to output of frequency meter: generator of modulating code, phase manipulator, second input of which is connected to output of high frequency generator. Ground station is made in form of, installed serially: receiving antenna, high frequency amplifier, mixer, intermediate frequency amplifier, first multiplexer, narrowband filter, second multiplexer, low frequency filter. Second input of mixer is connected to output of heterodyne. Second input of first multiplexer is connected to output of low frequency filter. Second input of second multiplexer is connected to output of intermediate frequency amplifier. connected to output of low frequencies filter are registration block and sound signaling device.

EFFECT: increased speed and trustworthiness of transfer of warning information.

3 dwg