Method of prospecting hydrocarbons

FIELD: seismic prospecting.

SUBSTANCE: method comprises recording seismic vibrations of the Earth in a given range, generating and recording additional seismic vibrations, extracting information signal, which is a signal from the productive pool, analyzing the spectra of the data obtained, and determining presence or absence of hydrocarbons and position of productive hydrocarbon pools.

EFFECT: enhanced accuracy and reliability of prospecting.

19 cl, 4 dwg

 

The invention relates to the field of seismic surveys, namely the search area of hydrocarbons, and may be used in the search for hydrocarbons on land and offshore waters, as well as at the interface of the hydrocarbon - water in hydrocarbon extraction and monitoring storage of hydrocarbons in natural underground reservoirs.

Currently, almost all work associated with the search for hydrocarbons, or otherwise associated with seismic exploration. Traditionally, seismic exploration is a registered distribution in the earth's crust generated seismic waves with subsequent mathematical processing of the data. Currently known methods of seismic exploration typically use the registration of the passage of seismic vibrations with a frequency of more than 10.0 Hz. For use in seismic exploration of such frequencies widely developed instrumentation for the generation and registration of such fluctuations, as well as mathematical tools for data processing. To generate such oscillations predominantly use or vibrators, or explosions. For blasting should be drilling holes for planting explosives. This technique dramatically negative impact on the state of the environment in the search area. The AOC is e, the success rate of predictions using known methods and techniques of seismic exploration does not exceed the value of 0.5. Therefore, at least one second well, drilled on the conclusions of the traditional seismic exploration for oil and gas deposits, is incorrectly laid. In addition to the money spent in vain on drilling, with irreparable and unjustified damage to the environment.

The known method of vibroseismic when you search for hydrocarbon deposits (RU, patent 2045079). According to a known method excite seismic vibrations vibrator, recorded three-component seismic receivers seismic signal and perform mathematical processing, and seismic excite oscillations in the frequency range of 2-5 Hz for at least 3 minutes, recording the seismic signal is carried out for at least 20 minutes before the initiation of seismic vibrations and not more than 5 minutes after the generation of seismic vibrations, as the seismic signal using seismic background of the Earth, and on the availability of deposits is judged by the increase in the area under the curve mutual spectrum of the same component in the recording of seismic background after excitation of seismic vibrations in comparison with the recording signal to generated the I oscillations.

The disadvantage of this method should recognize his low information, not to determine the depth of the deposits, as well as the complexity of the mathematical analysis of the received signals due to the inability of the Department of the recorded interference.

Also known way to search for hydrocarbon deposits (RU, patent 2161809). According to a known method carried out generating seismic vibrations by sassoferrato in the range from 2 to 5 Hz, recorded information signal using three-component seismic receivers oscillations capable of recording an information signal in the infrasonic range and located at a distance of not more than 500 m apart and no further than 500 m from sassoferrato, in the frequency range from 2 to 5 Hz simultaneously on all three components both before and during the generation of the seismic signal, and the presence of hydrocarbon deposits are judged by the appearance of spectral anomalies of the information signal at least one of the component when recording the information signal in the generation time of seismic vibrations in comparison with the information signal, measured to generate.

The disadvantage of this method should recognize his low information, not to determine the depth of the deposits, as well as the complexity of the mathematical analysis of the received signals due to n is the possibility of separation of the recorded interference.

The technical problem to be solved by the present invention is to improve the accuracy of productive hydrocarbon reservoirs, including the definition of depth.

The technical result obtained by implementing the method consists in reducing the number of incorrectly drilled wells, as well as the opportunity to control the operation of wells and gas storage facilities in the extraction of oil and gas.

To achieve the technical result according to the first variant it is proposed to use way of finding hydrocarbons, characterized by the recording of seismic oscillations of the Earth's surface using receivers seismic vibrations, capable of detecting seismic vibrations in the range from 0.1 to 20 Hz, and receivers seismic vibrations have on distance from 50 m to 500 m from each other, the registration is done simultaneously for all measured components, dividing the time range check measured on promising areas of the information signal for synchronized time for all seismic receivers discrete areas, carry out the calculation of spectral characteristics associated with each discrete area with the formation of a discrete sequence, analyze each the discrete part is OK for the presence of interference, with man-made nature, and on the occurrence of an event associated with the arrival of the signal from the productive formation, exclude from further consideration those discrete areas that do not contain events associated with the arrival of the signal from the productive formation in each of the records of the respective component seismic receivers, as well as discrete areas containing the specified interference, and analyze the remaining discrete areas with making judgments about the presence or absence of hydrocarbons. Preferably when implementing the method further carry out the measurement of seismic vibrations in the place, certainly not containing hydrocarbons, and the presence of oil or gas judged by the appearance of deviations in spectral characteristics, compared with the place, certainly not contain hydrocarbons. The method can be implemented both on land and in the water area, and consequently the seismic receivers are placed on land, on the bottom, or recessed in the surface layer in the aquatic environment, and/or watercraft in areas minimally affected their own variations of the hull boats, and the boats were removed at the same distance from the source of generation of vibrations.

According to the second variant of achievement of the specified technical result is proposed to use the search method is glendorado, characterized by the recording of seismic oscillations of the Earth's surface using receivers seismic vibrations, capable of detecting seismic vibrations in the range from 0.1 to 20 Hz, and spend the generation of seismic vibrations of the vibration source in the range from 1 to 10 Hz, the seismic receivers fluctuations have on distance from 50 m to 500 m from each other and from 50 m to 500 m from the source of seismic vibrations, recording of the information signal is carried out in the frequency range from 0.1 to 20 Hz for all measured components as in time of generation of oscillations, and after generating seismic vibrations, breaking the time range check measured on promising area information signal into discrete parts, carry out the calculation of spectral characteristics associated with each discrete area with the formation of a discrete sequence, analyze each discrete area on the interference with human nature, and on the occurrence of an event associated with the arrival of the signal from the productive formation, exclude from further consideration those discrete areas that do not contain events associated with the arrival of the signal from the productive formation in each of the records of the respective component seismic receivers and the discrete phase is, containing the specified interference, and analyze the remaining discrete areas with making judgments about the presence or absence of hydrocarbons. In a preferred embodiment, the implementation of advanced measure micro-seismic noise of the Earth and the presence of hydrocarbons is judged by the appearance of changes in the spectral characteristics of at least one component when the recording signal during the generation of oscillations and/or after generation of the oscillations compared to an information signal, measured to generate. The proposed method can be implemented also on land and in the water area, so the seismic receivers are placed on land, on the bottom and/or on boats in areas minimally affected their own variations of the hull boats, and the boats were removed at the same distance from the source of generation of oscillations. In all cases, the implementation of the proposed method usually receivers seismic vibration group, and synchronize. In addition, the mathematical processing of the registered results primarily an information signal is divided into time sections, lasting no less than 2-3 periods of the lowest signal frequency range.

This technical result is reached and also when using the method for determining the depth is of the productive formations, including placing at least four receivers seismic vibrations, capable of detecting fluctuations in the infrasonic frequency range and recording the information signal, the information signal using micro-seismic noise of the Earth, and over pre-identified a hotbed of seismic activity oil and gas fields are placed at the vertices of a predominantly convex quadrangle seismic receivers, capable of detecting both vertical and horizontal ultralow-frequency seismic vibrations, over a period of time sufficient to record a statistically signicant noise signal in the ultralow-frequency range generated by the oil and gas field, conduct the generation of seismic vibrations of the vibration source in the range from 1 to 10 Hz, calculate the spectral density of vertical the horizontal component, and the spectral density of the cross-correlation functions registered ultralow-frequency oscillations, then, solving the inverse wave problem of propagation of acoustic radiation from a cylindrically symmetric source, determine the depth of the productive hydrocarbon reservoir.

To ensure the search of hydrocarbons on land proposed according to the one who called the first option the following. Have over the alleged reservoir, at least one receiver seismic vibrations, capable of detecting fluctuations in the infrasonic frequency range, at least one component, and hope all at the same time used by the receivers, the spectral characteristics of the microseismic noise at frequencies from 0.1 to 20 Hz for all measured components. Preferably repeat the check at other points over the alleged place of occurrence of hydrocarbons. On the availability of deposits is judged by the change in the spectral characteristics of the information signal or their various combinations, allows to reduce the influence of interference. In the context of this invention, the term “spectral characteristics” means the options or their combination, obtained by spectral analysis of the information signal, and the specified spectral analysis may include Fourier analysis (Fourier transform, Wavelet analysis), and the decomposition of the information signal in a series that converge only asymptotically. The information signal in the context of this work, understand the measured signal of microseismic oscillations subjected to mathematical treatment according to a series of algorithms, in particular, to the following to clean from interference and the selection signal radiated in a given reservoir. E.g. the measures as the spectral characteristics can be selected spectral output of the measured signals and/or crosscorrelate, or combinations thereof, enabling to reduce interference. In particular, the presence of deposits is judged by the change in the spectral power of JAA(f) the information signal on the measured frequencies on growth correlation information of the same signal component (at least one) at different points of observation relative to the information signal for the plot, obviously does not contain uglevodorodnogo (1,2). Crosscorrelate information signal, in particular, can be characterized using the correlation coefficient kAB(f) and to be associated with a different spectral characteristic of the signal spectral density of the cross-correlation function of JAB(f) the following relationship:

where a, b are two points of observation, f is the frequency.

An example of a combination of specified spectral characteristics, which reduce the influence of interference, in particular, is:

where ftfbrespectively the upper and lower bounds informative range, ν, p - respectively the indexes of the records before exposure and after (during). P1describes the change in energy flux of the radiation in one of the th component is the impact of the seismic wave source.

After recording microseismic noise receivers transferred into a new measuring point, observing the same conditions of placement of receivers, and repeat the process of recording microseismic noise of the Earth.

Figure 2 shows the results of processing microseismic noise measurements of the Earth in 4 observation points over the potentially gas-bearing area in the South-West of the Ural foredeep. Figure 2 shows the parameter that characterizes the change in the spectral characteristics at the measurement points with respect to the spectral characteristic at the point obviously outside of the contour of occurrence of hydrocarbons (near dry wells). Drilling near the point And confirmed the presence of hydrocarbon deposits.

To obtain the values standing in the right part of expression (1), (2) time range check measured over the alleged place of occurrence of hydrocarbons of the information signal is divided into a synchronized time for all seismic receivers discrete areas, carry out the calculation of spectral characteristics corresponding to each discrete area with the formation of a discrete sequence, analyze each discrete area on the interference with human nature, and on the occurrence of an event associated with the arrival of the signal from the productive formation. Exclude from further consideration those discrete the plots which do not contain events associated with the arrival of the signal from the deposits in each of the records of the respective component seismic receivers, as well as discrete areas containing the specified interference, and analyze the remaining discrete areas with making judgments about the presence or absence of hydrocarbons. The event associated with the arrival of the signal from the productive formation is determined with a high degree of probability unambiguously interpreted the ratio of the spectral characteristics of the measured seismic vibrations in the informative range of frequencies. For example, such an event is the reduction of the angle between the normal to the surface and the velocity vector of the displacement of the measured vibrations at a particular discrete area of the partition relative to the average angle for all sections of the split in an informative range of frequencies. Such filtering reduces the noise influence on the results of the calculations and to increase their accuracy. In addition, the very fact of the appearance or not of occurrences at a given point of measurement events associated with the arrival of the signal from deposits, allows to make a conclusion about the presence or absence of deposits from the analysis of spectral characteristics of discrete areas without additional information.

When you search for hydrocarbons in the waters under alternative not me is it one receiver seismic vibrations, capable of at least one component to record infrasound vibrations, placed either on the bottom of the waters, or recessed in the aquatic environment, either on Board, mostly self-propelled craft, and measure micro-seismic noise of the Earth at the same time for all measured components. If the receiver of seismic vibrations on Board the vessel should choose the least noisy informative in the frequency range of the space craft. Mainly registration is done for at least 30 minutes Receivers are placed on the bottom (on Board ships, recessed in the aquatic environment), grouping, approximately 50-500 m from each other. In this case, the point of registration is commonly placed on the surface of the water at equal distance from all the receivers seismic vibrations. The spectral characteristics of the information signal microseismic noise of the Earth, obtained outside of the contour of the occurrence of hydrocarbons and over him, almost identical to the characteristics shown in figure 2 and 4.

When you search for hydrocarbon deposits on land on the second version over the place of the alleged finding of hydrocarbons have the receivers of the acoustic vibrations can detect infrasound vibrations in at least one of a component similar to the first VA is Ianto, but additionally produce a generation of seismic source seismic vibrations in the range from 1 to 10 Hz. The sensors have from 50 m to 500 m from the source of seismic vibrations, hold the record of seismic background of the Earth within, preferably, 20 min, include the seismic wave source and without registration microseismic noise, generate seismic vibrations for about 3 minutes Recording microseismic noise of Land may be continued after the termination of the generation of oscillations (figure 3). Processing of measured seismic vibrations is similar to the first embodiment, however, the presence of deposits can be judged by the appearance of changes in the spectral characteristics of at least one component when the recording signal during the generation of oscillations and/or after generation of the oscillations compared to an information signal, measured to the generation or analysis of the spectral characteristics of discrete areas of the microseismic noise during/after the action of the vibrator. Use this version allows to detect the presence of hydrocarbons more confident (see figure 4). Figure 4 shows the results of processing microseismic noise measurements of the Earth in the same 4-point observations of potentially gas-bearing what Hayon, but using this option. It is well visible that the two groups of points a, b, C, D now separated more clearly.

An important step in the placement of seismic receivers in all cases, the measurement of oscillations is their grouping that allows for further signal processing to reduce the effect of noise and apply the algorithm selection information signal.

When you search for hydrocarbons in the waters on the second version receivers seismic oscillations place similar to the first. In the rest of the measurements produce similar measurements on land on the second option.

In the framework of implementation of the first and second options can be solved the task of controlling exploitation of hydrocarbon deposits. To do this over the oil pick up, preferably having them near the production wells. At selected points have receivers seismic vibrations, capable of detecting seismic vibrations in the infrasonic frequency range not less than one component. Periodically recorded microseismic noise of the Earth. The disappearance of the anomaly spectral characteristics at frequencies of 0.1-20 Hz judge the passage of the contact water - hydrocarbon under point control. Anomalous behavior of the spectral characteristics define any of the following without the skin is of external influence, analyzing the behavior of the spectral characteristics of each discrete area partitioning time range, or relative to the spectral characterization information signal registered for the site, certainly not lying above the reservoir, and in the variant with application of an external impact, using the same processing algorithms fluctuations, but applying them to the recorded signal during/after exposure to seismic wave source, or contact transfer water - hydrocarbon judged by the appearance of changes in the spectral characteristics of at least one component when the recording signal during the generation of oscillations and/or after generation of oscillations in comparison with the spectral characteristics the information signal, measured to generate. It is preferable to register the spectral characteristics of the microseismic noise for each point within 40-60 minutes

When monitoring the degree of filling of underground gas storage natural gas is chosen point on the Earth's surface, roughly defining different degrees of filling of the storage, placed at selected points of the receivers seismic vibrations, capable of at least one component to record infrasound vibrations, and periodically record the spectral nature is to stick micro-seismic noise of the Earth, moreover, the absence of abnormal changes in the spectral characteristics of the information signal at frequencies of 0.1-20 Hz indicates the absence of natural gas under the point of control. For comparison register the same receiver micro-seismic noise of the Earth over the place, obviously outside of the storage. It is preferable to select the control points at the first filling of the storage, determining where on a gas marked by the presence of natural gas in various amounts filed by gas. But in any case, the point of control shall be determined empirically. Possible generation of seismic vibrations in the registration process. In this case, the registration is done before the beginning of the generation, and the generation time.

Using, in particular, the second option (generation), you can determine the depth of the productive hydrocarbon reservoir. For this purpose, not less than 4 receivers seismic fluctuations can in 3 mutually perpendicular components to record infrasound vibrations, placing them at the vertices of a quadrangle. For the spectral power of the information signal is the following decomposition for the energy spectrum, respectively, the vertical and horizontal component with uniform accounting and isot opnai interference in the epicentral area at each point of observation:

where <Uz(r,d)2> <Ur(r,d)2> respectively vertical and horizontal component of the spectral power information signal, <Nz2> <Nr2> - vertical and horizontal component of the spectral power of the noise, r is the distance from the epicenter to the point of measurement, d is the depth of the source. Then, using the calculated spectral power of the information signal after generation and spectral density crosscorrelation functions as a useful frequency range, fixing the type of radiation source, is determined by the depth of productive on hydrocarbon reservoir.

This method is used to calculate the depth of the productive formation near the production well to the South of the Orenburg region. The calculated value was about 2800 m at the depth of the productive formation 3222 m

In all the above embodiments of the present invention, a fundamental and important step is the process of filtering the recorded time series of surface noise and the selection of the information signal. For this purpose, use grouping (arrangement) receivers seismic vibrations and cross-correlation processing of the recorded signal.

To implement the above option which can be used by the receiver of seismic vibrations, capable of detecting fluctuations in the infrasonic range, containing at least one seismic vibration sensor, capable of detecting infrasonic vibrations, and all the sensors are located on a hard surface in such a manner that the axis of sensitivity of the sensors are located under the fixed angles relative to the flat rigid base and relative to each other, and each sensor is connected to the recording unit, and the base with sensors placed in rigid, leakproof housing. Can be used with sensors of angular and/or linear oscillations, is capable of detecting fluctuations in the infrasonic frequency range. Mainly registration unit for each sensor contains connected in series preamplifier signal, the driver amplitude-frequency characteristics and final amplifier, each final amplifier configured to connect to the logger.

The use of the invention will improve the accuracy and reliability of determining the presence of hydrocarbon deposits.

1. The way of finding hydrocarbons, including registration of seismic vibrations of the Earth's surface using receivers seismic vibrations, capable of detecting seismic vibrations in the range from 0.1 to 20 Hz, and the pickup is Nicky seismic vibrations have a distance of from 50 to 500 m from each other, registration is done simultaneously for all measured components, dividing the time range of reception measured in the promising area of signal synchronized time for all seismic receivers discrete areas, carry out the calculation of spectral characteristics corresponding to each discrete area with the formation of a discrete sequence, analyze each discrete area on the interference with human nature, and the presence of the information signal, which receive the signal radiated in a given reservoir, exclude from further consideration those discrete areas that do not contain these signals in each of the records of the respective component seismic receivers, as well as discrete areas containing the specified interference, and carry out the spectral analysis of the remaining discrete sites and judge the presence of hydrocarbon deposits on the change in the spectral power of the information signal at the measured frequencies.

2. The method according to claim 1, characterized in that it further carry out the measurement of seismic vibrations on the site, obviously not containing hydrocarbons, and the presence of hydrocarbons is additionally judged by the appearance of deviations in the spectral characteristics, compared with the plot, obviously do not contain hydrocarbons.

3. The method according to claim 1, wherein the seismic receivers are placed on the land.

4. The method according to claim 1, wherein the seismic receivers are placed on the bottom.

5. The method according to claim 1, wherein the seismic receivers are placed on the waters in the surface layer of water.

6. The method according to claim 1, wherein the seismic receivers are placed on boats in areas minimally affected their own variations of the hull boats, and the boats were removed at the same distance from the source of generation of vibrations.

7. The method according to claim 1, characterized in that the receivers seismic vibration group.

8. The method according to claim 1, characterized in that the receivers seismic vibrations synchronizat.

9. The method according to claim 1, characterized in that the information signal is divided into time sections, lasting no less than 2-3 periods of the lowest signal frequency range.

10. The way of finding hydrocarbons, including registration of seismic vibrations of the Earth's surface using receivers seismic vibrations, capable of detecting seismic vibrations in the range from 0.1 to 20 Hz, spend the generation of seismic vibrations of the vibration source in the range from 1 to 10 Hz, receivers seismic vibrations have a distance of from 50 to 500 is from each other and from 50 to 500 m from the seismic wave source, registration is done at frequencies from 0.1 to 20 Hz for all measured components as in time of generation of oscillations, and after generating seismic vibrations, breaking the time range of reception measured in the promising area of the signal at discrete sites, carry out the calculation of spectral characteristics corresponding to each discrete area with the formation of a discrete sequence, analyze each discrete area on the interference with human nature and the presence of the information signal, which receive the signal radiated in a given reservoir, exclude from further consideration those discrete areas that do not contain these signals in each of the records of the respective component seismic receivers, as well as discrete areas containing the specified interference, conduct spectral analysis of the remaining discrete areas, and judge the presence of hydrocarbon deposits on the change in the spectral power of the information signal at the measured frequencies.

11. The method according to claim 10, characterized in that it further measure micro-seismic noise of the Earth and the presence of hydrocarbons is additionally judged by the appearance of changes in the spectral characteristics of at least one component when the recording signal during the generation of oscillations and/or the after generating oscillations in comparison with the information signal, measured to generate.

12. The method according to claim 10, wherein the seismic receivers are placed on the land.

13. The method according to claim 10, wherein the seismic receivers are placed on the waters in the surface layer of water.

14. The method according to claim 10, wherein the seismic receivers are placed on the bottom.

15. The method according to claim 10, wherein the seismic receivers are placed on boats in areas minimally affected their own variations of the hull boats, and the boats were removed at the same distance from the source of generation of vibrations.

16. The method according to claim 10, characterized in that the receivers seismic vibration group.

17. The method according to claim 10, characterized in that the receivers seismic vibrations synchronizat.

18. The method according to claim 10, characterized in that the information signal is divided into time sections, lasting no less than 2-3 periods of the lowest signal frequency range.

19. The method of determining the depth of productive hydrocarbon reservoirs, including placing at least four receivers seismic vibrations, capable of detecting fluctuations in the infrasonic frequency range and recording the information signal, the information signal using micro-seismic noise of the Earth, trichosis fact, above the pre-identified a hotbed of seismic activity oil and gas fields are placed at the vertices of a quadrangle seismic receivers, capable of detecting both vertical and horizontal ultralow-frequency seismic vibrations, over a period of time sufficient to record a statistically signicant noise signal in the ultralow-frequency range generated by the oil and gas field, conduct the generation of seismic vibrations of the vibration source in the range from 1 to 10 Hz, calculate the spectral density of vertical, horizontal component, and the spectral density of the cross-correlation functions registered ultralow-frequency oscillations, then, solving the inverse wave problem of propagation of acoustic radiation from a cylindrically symmetric source, determine the depth of the productive formation.



 

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3 cl, 8 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has measuring tank and tachometer generator and pressure and temperature sensors on it. It is mounted at distance of one tubing pipe from extracting pump, where pressure is higher than saturation pressure, i.e. in one-phase liquid flow, and serves as connecting sleeve. At distance of two tubing pipes from deep station in connection sleeve additionally mounted is sensor of liquid hydrostatic pressure. Measurement of base parameters characterizing production of oil and gas product wells, is performed directly in the well close to position of extracting pump. Device allows to perform systematical measurements of product parameters individually for each product well at all stages of deposit extraction. Use of deep stations for measuring parameters of oil and gas wells product excludes use of expensive and complicated switching execution mechanisms of automated group measuring plants.

EFFECT: higher efficiency.

1 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: source comprises vehicle with platform, control unit, falling mass set in the guiding pipe, emitting plate, wrench mechanism, rope which connects the mass with the drum of the wrench mechanism. The guiding pipe is provided with air-operated starting accelerator, chamber with exhaust ports, and device for locking mass in the top position. The starting accelerator is made of chamber with piston. The falling mass is locked in the pipe at the top level and hermetically closes the exhaust port made in the piston of the chamber.

EFFECT: improved design.

3 cl, 2 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: seismic prospecting.

SUBSTANCE: method can be applied at prospecting of oil and gas pools as in sedimentary and in metamorphic and crystal rocks. Seismic waves induced by seismic standard source close to surface are registered. Wave fields are formed from expected objects of reflection, diffraction and dissipation and parameters of processing are chosen in such a manner to provide better selection of modeled objects on the error background. Received parameters are used for processing real data and selecting real objects. Shapes of objects of dissipation are presented in form of maps and sectional views.

EFFECT: increased level of valid signal.

5dwg

FIELD: protection aids.

SUBSTANCE: direction finder can be used for taking azimuth relatively guarded objects at guarded areas, calculating number of objects in group target and classifying found objects. Direction finder has two seismic receivers, two processing channels with delay lines and correlators, maximal signal selector, correlator, testing module, commutator and calculator. To realize the direction finding function the method of passive diversity detection and ranging is used. The main information criterion for finding direction to object has to be the function of mutual signals correlation in two signal processing channels. Value of azimuth is judged from value of signal delay. Change in value of signal delay is equivalent to controlling directional diagram of seismic active aerial which allows classifying detected objects separately. Test influence is used for adaptation of speed of propagation of seismic wave which changes under influence of meteorological conditions. Current value of speed of propagation of seismic wave is judged from time of delay of test influence signal coming to second seismic receiver. Tuning of lines of delay is conducted correspondingly to those changes.

EFFECT: improved precision of direction finding.

2 dwg

FIELD: seismic prospecting, applicable for excitation of seismic waves by on unexplosive seismic source with an electromechanical drive.

SUBSTANCE: in the claimed device the main and additional excitation windings are made in the form of excitation windings of direct and reverse motion of the radiator operating member. The device uses a commutating capacitor, which via the first commutating thyristor is connected to the excitation winding of the direct and reverse motion of the operating member, and via the second commutating thyristor - to the excitation winding of the direct and reverse motion of the operating member, the commutating capacitor is shunted by the series-connected third diode and the third inductance coil.

EFFECT: enhanced efficiency and repetition frequency of force actions, simplified control of the amplitude and duration of the excited seismic waves.

3 dwg

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