Marine electrical exploration device and process of electrical exploration on run

FIELD: physics; geophysics.

SUBSTANCE: current pulse is excited in the medium under investigation, and parameters of its induced polarisation are defined. Geoelectric section is generated to make a conclusion about the presence of hydrocarbon fields on the basis of abnormal manifestations of induced polarisation parameters. At that, electromagnetic and seismic waves are excited simultaneously or with a time shift. To excite the said waves unipolar rectangular impulses of direct current are generated, their absolute and relative duration depending on parameters of medium under investigation. In the beginning of timing pulse electric field is measured simultaneously at measuring probe groups of two detector lines towed at different depth. Besides, detector line depth and hydroacoustic pressure of seismic source are measured. Also a device is offered, which includes pulse generator, capacitor charging unit, power generator, bank of capacitors, switchboard, seismic emitter, transmitter/receiver line, receiver line, multi-channel gauge, echo-sounder, GPS satellite navigation receiver, signal processor.

EFFECT: higher reliability of research results.

18 cl, 6 dwg

 

The technical field to which the invention relates.

The group of inventions "Device for marine em and the way the marine electrical exploration in movement of the vessel" relates to the field of exploration Geophysics, in particular to Geoelectromagnetic by the method of induced polarization in conjunction with the seismoelectric effect. Used for sensing the seabed in offshore zone and is intended for forecasting of hydrocarbon deposits, water, hydrocarbonates and other related chemicals.

The level of technology

Known invention "Method and apparatus for offshore electromagnetic sounding utilizing wavelength effects to determine optimum source and detector positions", US patent, No. 4617518, Srnka, Oct.14, 1986, which used magnetic and electrical measurements of the parameters of the investigated medium, but trailed reception line does not take into account the vertical component of the electric field, which significantly reduces the reliability of building a geoelectric section.

Known invention "geoelectroprospecting", patent RU 2219568, Rachlinski NI and others, Feb. 2003, in which for the prediction of hydrocarbon deposits have built a model of the environment that is closest to the geometric structure and electrical parameters being examined. Used the equation of mathematical physics the strength of the dipole source in El kelaa trokhimenko polarizable environment. However, this model due to the multiplicity of solutions of the original equation does not adequately describe the research environment and has a probabilistic nature.

Known invention "Remote reservoir resistivity mapping", US patent No. 6603313, Srnka, Aug.5, 2003, which on the basis of previously obtained geological data about the presence of hydrocarbon deposits for a more detailed definition of hydrocarbon deposits used a spatial grid of the recording electromagnetic wave sensors, rigidly fixed on the surface of the seabed. However, this method of determining parameters of the studied environment cannot be used in the movement, because it has a stationary character.

Known invention "Geophysical prospecting", US patent No. 5877995, Thompson et al., Mar.2, 1999, which used electroseismic method for prediction of hydrocarbon deposits, but not in sea conditions.

"Electromagnetic-to-seismic conversion: successful developments suggest viable applications in exploration and production", A.H.Thompson, Abstracts of EM Technical Session, SEG, Houston, 2005, reviewed the basics of se and electroseismic method, however, for the determination of hydrocarbon deposits on land.

The closest technical solution for the proposed device and method of naval intelligence is "a device for marine electrical exploration in movement of the ship and the way the marine electrical exploration"under the tent RU # 2253881, Lisitsyn DU and others, June, 2005, which used multi-mnogorazovye measurements of the investigated medium using conversion characteristics obtained on the basis of the selection of the parameters of a layered conducting and polarizable environment. However, the proposed solution does not have sufficient spatial resolution due to the use of only one instrument cable, and the absence of additional stimulation on the seismic environment of the emitter.

Disclosure of inventions

You want to discover deposits of hydrocarbons and related substances based on the study of the effect of induced polarization.

The problem posed is solved by excitation in the test environment of pulses of electromagnetic radiation causing the effect of induced polarization, with simultaneous excitation intervals of time of seismic waves, causing an additional change in the induced-polarization effect. This used two towed at different depths of reception electrode lines.

The technical result of the group of inventions is to increase the reliability of research results.

The invention is illustrated in the drawings, which shows a device for marine electrical exploration and relative position of its parts.

Brief description chere the hedgehogs

Figure 1 is a General diagram of a device for determining parameters of the induced polarization.

2 is a diagram of the location of the measuring cable lines and sources of radiation relative to the vessel.

Figure 3 - Scheme of distribution of seismic (21) and electromagnetic (22) waves above the hydrocarbon Deposit (24), and the reflected electromagnetic wave (23), which is registered symmetrically arranged electrodes M1, O1, N1 and M2, O2, N2, and asymmetrically arranged electrodes M3, O3, N3.

4 is a graph illustrating the cycle of operation of the device:

a) a clock pulse with a duration of t0-t1;

b) a pulse of electromagnetic radiation with a duration of t0-t3;

in - pulse seismic radiation with a duration t4-t5;

g) - form of the electric field is recorded on one of the pairs of receiving electrodes.

The problem will be solved using the device for a marine survey method containing the pulse generator (1), the unit for charging the capacitors (2), which is powered by a generator (3), the capacitor (4), the switch (5), forming two sequences of unipolar rectangular pulses of constant current, seismic emitter (6) with adjustable length of the discharge gap excitation of seismic wave (21), two-way line (7), which excites an electromagnetic wave (22) and is receiving electrode (18), the pressure sensor (19), hydrophone (20), the receiving line (8) with the same electrodes, sensors and hydrophones, multi-channel measuring device (9), echo sounder (10), the satellite navigation receiver of global positioning system (GPS) (11) and a processor for processing signals (12), characterized in that the switch (5) provides for the formation of two channels of rectangular current pulses with a duration from 0.1 to 10 sec and amperage from 0 to 2500 And the feeding electrodes (13, 14) of the electromagnetic emitter and the electrode (15, 16) seismic emitter (6), towed behind the vessel at a predetermined depth transceiver line (7), with the length measuring part is not less than 2000 m, made in the form of a multi-conductor logging cable with neutral buoyancy with providing spatial orientation of the cable in the space stabilizers burial (17)located at the ends of the receive / transmit lines (7) copper electrodes (13, 14)symmetrically positioned graphite electrodes (18), pressure sensors (19), hydrophones (20), and the selection line(8)having the length measuring part is not less than 1000 m, made in the form of a multi-conductor logging cable with neutral buoyancy, providing spatial orientation of the cable in the space stabilizers burial (17)symmetrically positioned grafitowymi electrodes (18), pressure sensors (19), hydrophones (20).

In addition, the unit for charging capacitors provides an adjustable charge rate of the capacitor from 0 to 50 And a DC block to charge the capacitor provides an adjustable charge rate of the capacitor from 0 to 3000 VDC capacitance of the capacitor is from 300 to 500 mF, the distance between the electrodes seismic radiator is from 1 to 10 m, the transmitting and receiving line has from 3 to 6 pressure sensors, transmitting and receiving line has from 3 to 6 hydrophones, transmitting and receiving line has from 6 to 12 stabilizers burial, a reception line has from 2 to 3 pressure sensors / reception line has from 2 to 3 hydrophones, the selection line is from 3 to 6 stabilizers burial.

The implementation of the invention

At the exit of the vessel to the point of beginning of the profile runs the processor (12), the generator control pulses (1), the unit for charging the capacitors (2), multi-channel measuring device (9), echo sounder (10), GPS (11) and starts the charging of the capacitor (4) to a specified voltage level. In a given navigation point that is determined by a GPS system (11), is formed by a clock pulse with a duration from 10 to 15, by which time t0 open the high-voltage keys dual switch (5) and begins the discharge condens the tori respectively through the electrodes (13, 14) with the excitation of electromagnetic waves (22) and through the electrodes (15, 16) with the excitation of seismic waves (21). Each channel discharges with a duration of 0.2 to 0.5 s, after which the capacitor again begins to charge. The discharge parameters are controlled by the multi-channel measuring device (9).

Simultaneously with the discharge at time t0 starts collecting data from groups of the measuring electrodes M1, O1, N1 and M2, O2, N2 receive / transmit lines (7) and M3, O3, N3, suction line (8), as well as from all pressure sensors (19), hydrophones (20), echo sounder (10) and GPS (11). The DC component of the electrical conductivity of the medium is measured at the electrodes a, b, N3, N4.

All data streams are recorded on a hard medium and adapted to the current navigation point. The end of data reading will be determined by the end of the clock pulse. After you receive a signal on the charge capacitor to a given level, served next clock pulse and the system repeats itself.

In the process of passing vessel geological profile is generated database of these parameters of the investigated medium, as the electrical conductivity, the polarizability and the time constant of decay of electrode potentials, which together determine the effect of induced polarization.

The advantage of the specified device is used such PR the spatial structure of the receiving electrodes, when radiating the electromagnetic wave dipole (13, 14) is located symmetrically with respect to the groups receiving electrodes M1, O1, N1 and M2, O2, N3, allowing you to more accurately determine the outline of the proposed reserves (24) and to eliminate the noise interference, as the signals received on different sides relative to the Central location of the radiating dipole, have different signs. In addition, significantly greater than in the prototype, namely not less than 2000 m, the length of the radiating dipole reduces the attenuation of the waves during their propagation in liquid and sludge environments. Additional reception line (8), which is towed in the bottom layers will allow you to fix the vertical and radial component parameter changes induced polarization.

Adopted by the spatial geometry of the transmission and reception lines in conjunction with the accurate positioning of the emitting and receiving electrodes with respect to a proposed hydrocarbon deposits can significantly improve the resolution of the device.

Thus, we achieve the technical result is to increase the reliability of research results.

The closest method to the proposed method of naval intelligence is "a device for marine electrical exploration in movement of the ship and the way the sea em"Pat the NT EN No. 2253881, Lisitsyn DU and others, June, 2005.

Using the above device for a marine survey method is the following method marine electrical exploration in movement of the vessel. Way marine survey method is characterized by the fact that they perform profiling by excitation in the test environment at the same time or with a time shift of electromagnetic and seismic waves, the excitation of which form respectively for channel electromagnetic and seismic waves unipolar rectangular pulses of constant current, duration, and duty cycle which depends on the parameters of the investigated medium, at the beginning of the clock pulse carry out simultaneous measurement of the electric field in the groups receiving the two electrodes towed at different depths receiver lines, and measure the depth of the receiving lines and hydroacoustic pressure from the seismic source.

In addition, the power source of electromagnetic waves is from 80 to 150 kJ, the power source of seismic waves is from 50 to 100 kJ, pulse DC have a duration from 0.1 to 10, depth towed receive / transmit lines from 10 to 20 m from the sea surface, the depth of the towed suction line from 10 to 20 m from the surface of the bottom of the sea, towing speed transceiver transmitting and receiving line is from 0.5 to 4 nodes.

The method is illustrated by the drawings.

5 is a Region allocated by the dashed line correspond to the known deposits of hydrocarbons. Profiles of experimental works, marked by a solid straight lines. The area highlighted in grey correspond to the hydrocarbon, registered by the method of induced polarization.

6. - Geoelectric section along the profile area of work:

(a) the amplitude of selected anomalous signal;

b) isolation of the front phase of the anomalous signal.

Profiling is performed while moving at a speed of from 0.5 to 4.0 knots vessel towed at different depths receiving and transmitting (7) and a suction line (8). When leaving the ship in a given water area runs the processor (12), the generator control pulses (1), the unit for charging the capacitors (2), multi-channel measuring device (9), echo sounder (10), GPS (11) and starts the charging of the capacitor (4) to a specified voltage level. In a given navigation point that is determined by a GPS system (11), is formed by a clock pulse with a duration from 10 to 15, by which time t0 open the high-voltage keys dual switch (5) and starts the discharge of the capacitors, respectively, through the electrodes (13, 14) with the excitation of electromagnetic waves through electrodes (15, 16) with the excitation seism the political wave. The excitation of seismic waves can be shifted in time relative to electromagnetic waves or absent. Each channel discharges with a duration of 0.2 to 0.5 s, after which the capacitor again begins to charge.

Simultaneously with the discharge at time t0 starts collecting data from all pairs of receiving electrodes (18), pressure sensors (19), hydrophones (20), echo sounder (10) and GPS (11). All data streams are recorded on a hard medium and adapted to the current navigation point. The end of data reading will be determined by the end of the clock pulse. After you receive a signal on the charge capacitor to a given level, served next clock pulse and the system repeats itself. As the geological profile is the process of accumulating a database of electrophysical parameters of the investigated medium.

Next, on the basis of abnormal behavior such parameters of the investigated medium, as the electrical conductivity, the polarizability and the time constant of decay of electrode potentials and their dependence on the conditions of excitation of electromagnetic and seismic waves, is the interpretation of the results from the point of view of the presence of hydrocarbon deposits.

The advantage of this method is that the use of long wavelength is lektromagnitnogo pulse high power in combination with exposure in specified time periods of seismic emitter gives more precise information about the parameters of the investigated medium.

Thus, we achieve the technical result is to increase the reliability of research results.

1. Device for marine prospecting, containing the pulse generator, a unit for charging the capacitors, which is powered by a generator, a capacitor, a switch that generates two sequences of unipolar rectangular pulses of constant current, seismic radiator with adjustable length of the discharge gap, exciting seismic wave transmitting line, which excites an electromagnetic wave and is receiving electrodes and sensors, the receiving line with the same electrodes and sensors, multi-channel measuring device, depth sounder, satellite navigation receiver of global positioning system (GPS) and a processor for processing signals, wherein the switch provides the formation of two channels of rectangular pulses current duration from 0.1 to 10 and amperage from 0 to 2500 And the feeding electrodes of the electromagnetic emitter and the electrode seismic emitter, towed behind the vessel at a predetermined depth transceiver line with the length measuring part is not less than 2000 m, made in the form of a multi-conductor logging cable with neutral buoyancy, providing spatial orientation office is La in space stabilizers burial, located at the ends of the transmitting line copper electrodes symmetrically positioned graphite electrodes, pressure sensors, hydrophones, and the selection line having the length measuring part is not less than 1000 m, made in the form of a multi-conductor logging cable with neutral buoyancy, providing spatial orientation of the cable in the space stabilizers burial symmetrically positioned graphite electrodes, pressure sensors, hydrophones, etc.

2. Device for marine electrical prospecting according to claim 1, characterized in that the unit for charging capacitors provides an adjustable charge rate of the capacitor from 0 to 50 And DC.

3. Device for marine electrical prospecting according to claim 1, characterized in that the unit for charging capacitors provides an adjustable charge rate of the capacitor from 0 to 3000 VDC.

4. Device for marine electrical prospecting according to claim 1, characterized in that the capacitance of the capacitor is from 300 to 500 mF.

5. Device for marine electrical prospecting according to claim 1, characterized in that the distance between the electrodes seismic radiator is from 1 to 10 m

6. Device for marine electrical prospecting according to claim 1, characterized in that the transceiver line is from 3 to 6 pressure sensors.

7. The device lamorski of electrical prospecting according to claim 1, wherein the transceiver line is from 3 to 6 hydrophones.

8. Device for marine electrical prospecting according to claim 1, characterized in that the transceiver line is from 6 to 12 stabilizers burial.

9. Device for marine electrical prospecting according to claim 1, characterized in that the reception line has from 2 to 3 pressure sensors.

10. Device for marine electrical prospecting according to claim 1, characterized in that the reception line has from 2 to 3 hydrophones.

11. Device for marine electrical prospecting according to claim 1, characterized in that the reception line has from 3 to 6 stabilizers burial.

12. Way marine electrical exploration in movement of the vessel, based on the fact that perform a study of the geological environment along the profile observations by the excitation current pulses in the test environment and define the induced polarization of the investigated medium, build geoelectric section and make a conclusion about the presence of hydrocarbon deposits on identified anomalies parameters induced polarization, characterized in that perform profiling by excitation in the test environment at the same time or with a time shift of electromagnetic and seismic waves, the excitation of which form respectively for channel electromagnetic and seismic waves unipolar rectangular pulses postoyanno the current the duration and duty cycle which depends on the parameters of the investigated medium, at the beginning of the clock pulse carry out simultaneous measurement of the electric field in the groups receiving the two electrodes towed at different depths receiver lines, and measure the depth of the receiving lines and hydroacoustic pressure from the seismic source.

13. Way marine survey method indicated in paragraph 12, characterized in that the power source of electromagnetic waves is from 80 to 150 kJ.

14. Way marine survey method indicated in paragraph 12, characterized in that the power source of seismic waves is from 50 to 100 kJ.

15. Way marine survey method indicated in paragraph 12, characterized in that the pulses of direct current have a duration from 0.1 to 10 C.

16. Way marine survey method indicated in paragraph 12, characterized in that the depth of the towed transceiver line is from 10 to 20 m from the sea surface.

17. Way marine survey method indicated in paragraph 12, characterized in that the depth of the towed suction line is from 10 to 20 m from the surface of the bottom of the sea.

18. Way marine survey method indicated in paragraph 12, characterized in that the towing speed transceiver and the suction line is from 0.5 to 4 nodes.



 

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