CN110632646A - Deep and distant sea seismic wave excitation device and excitation method - Google Patents
Deep and distant sea seismic wave excitation device and excitation method Download PDFInfo
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- CN110632646A CN110632646A CN201910978907.8A CN201910978907A CN110632646A CN 110632646 A CN110632646 A CN 110632646A CN 201910978907 A CN201910978907 A CN 201910978907A CN 110632646 A CN110632646 A CN 110632646A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
- G01V1/133—Generating seismic energy using fluidic driving means, e.g. highly pressurised fluids; using implosion
- G01V1/137—Generating seismic energy using fluidic driving means, e.g. highly pressurised fluids; using implosion which fluid escapes from the generator in a pulsating manner, e.g. for generating bursts, airguns
Abstract
The invention discloses a deep and far sea seismic wave excitation device and an excitation method, wherein the deep and far sea seismic wave excitation device comprises a cylindrical gas storage cavity, a cylindrical control cavity is connected to the closed end of the gas storage cavity, a bursting plate is connected to the open end of the gas storage cavity, a gas injection pipe is arranged on the closed end of the gas storage cavity, an ignition device is arranged in the gas storage cavity, a controller, a monitoring device, a power supply device and an ignition machine are arranged in the control cavity, and the method for exciting seismic waves comprises the following steps: completing the assembly of the excitation device and injecting combustible gas and oxygen; lowering the device to the seabed; the ignition device initiates gas in the gas storage cavity to react to generate high-temperature high-pressure gas, so that the explosion plate is broken to generate seismic waves.
Description
Technical Field
The invention relates to the technical field of geophysical exploration equipment, in particular to a deep sea seismic wave excitation device and a method for exciting seismic waves by using the deep sea seismic wave excitation device.
Background
Geophysical exploration is to detect geological conditions such as stratum lithology, geological structure and the like by researching and observing the change of various geophysical fields, explores the medium structure, material composition, formation and evolution of the earth body and the near-earth space, researches various related natural phenomena and change rules thereof, provides theories, methods and technologies for detecting the internal structure and structure of the earth, searching energy, resources and monitoring environment on the basis, and provides important basis for disaster forecast.
The deep open sea refers to a sea area with water depth below 4000-. The artificial sources commonly used at present include the following: the natural earthquake and the air gun earthquake source are the main earthquake sources for marine oil exploration and natural gas hydrate exploration at present, and play an important role in the aspects of seabed structure and evolution, continental shelf drawing and the like. However, natural earthquakes are uncontrollable, and accurate and effective observation is difficult to carry out; meanwhile, the traditional air gun seismic source has small energy and can only be excited on the sea surface, the propagation distance is limited, and the energy and the resolution are insufficient, so that an effective seismic source cannot be provided for geophysical exploration of the deep and far sea bottom. In addition, the seismic source needs to carry a cable for igniting when the seismic source is ignited for thousands of meters underwater, but the cable is unreliable for the water depth of thousands of meters, the water pressure is high mainly under the water depth of thousands of meters, the cable is vertically placed under the sea of thousands of meters, the dead weight of the cable can break the cable, and therefore a composite cable with a steel cable needs to be adopted, the cost is very high, and the use is not convenient.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a deep and far sea seismic wave excitation device and an excitation method, wherein the excitation device is simple in structure, convenient to use, large in single-shot output energy, high in initial bubble ratio and weak in bubble effect, so that high-energy seismic waves can be excited by utilizing gas-phase detonation of combustible gas and oxygen in a sea area below 4000-6000 meters in the deep and far sea, and an effective high-energy environment-friendly artificial seismic source is provided for geophysical exploration of the seabed in the deep and far sea area.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a deep sea seismic wave excitation device comprises a cylindrical gas storage cavity, wherein one end of the gas storage cavity is open, the other end of the gas storage cavity is closed, a cylindrical control cavity is connected to the closed end of the gas storage cavity, one end of the control cavity is open, the other end of the control cavity is closed, the closed end of the gas storage cavity is connected with the open end of the control cavity, a bursting plate is connected to the open end of the gas storage cavity, a gas injection pipe is arranged on the closed end of the gas storage cavity, one end of the gas injection pipe extends into the gas storage cavity, a stop valve is arranged at the other end of the gas injection pipe, an ignition device is arranged in the gas storage cavity, a controller, a monitoring device, a power supply device and an ignition machine are arranged in the control cavity, the monitoring device and the power supply device are respectively electrically connected with the controller, and the ignition device is electrically connected with the ignition machine, the monitoring device is electrically connected with the power supply device and is a timer or a pressure sensor.
Preferably, a first connecting flange is arranged at the closed end of the gas storage cavity, a second connecting flange matched with the first connecting flange is arranged at the open end of the control cavity, the first connecting flange and the second connecting flange are fastened and connected through a first bolt, a third connecting flange is arranged at the open end of the gas storage cavity, a fourth connecting flange matched with the third connecting flange is arranged on the side wall of the blasting plate, and the third connecting flange and the fourth connecting flange are fastened and connected through a second bolt, so that the gas storage cavity and the control cavity are fixedly connected, the connection strength is ensured, combustible gas and oxygen are conveniently injected into the gas storage cavity after the blasting plate is assembled, and meanwhile, after the gas in the gas storage cavity is reacted, high-temperature and high-pressure gas can be released from the blasting plate, so that the blasting plate is instantaneously cracked to generate seismic waves.
Preferably, a plurality of annular balancing weights fixed on the outer wall of the gas storage cavity are arranged at the opening end of the gas storage cavity, so that the excitation device is conveniently lowered into the deep sea, and the excitation device is conveniently kept in a vertical posture to fall down, and seismic waves are excited.
Preferably, be provided with rings on the closed end of control cavity, be convenient for like this to catch on rings through the crane hook on the test ship, will arouse the device and transfer to the sea, make arousing device freely sink in the sea after the unhook, do not need the hawser to pull like this, also need not carry the cable that arouses the ignition to effectively avoid the hawser to be pulled the condition of breaking because of the dead weight at the traction in-process, also avoided carrying the cable to arouse the unreliable condition of ignition simultaneously, its cost is lower, and convenient to use.
Preferably, be provided with seal ring one between flange one and the flange two, be provided with seal ring two between flange three and the flange four, seal ring one and seal ring two are metal seal ring and rubber seal ring composite seal structure, are convenient for seal the junction of gas storage cavity and control cavity, also are convenient for seal the open end junction of rupture disk and gas storage cavity simultaneously to avoid gas storage cavity to leak gas, influence its use, can effectively solve the sealed problem of excitation device under the high water pressure condition.
Preferably, the blasting plate is hemispherical and made of special steel, so that the blasting plate can bear high water pressure of the seabed.
Preferably, the material of the gas storage cavity and the material of the control cavity are both special steel with the yield strength larger than 900MPa, so that the gas storage cavity and the control cavity can be conveniently guaranteed to be capable of withstanding the pressure of corresponding water depth, and the gas storage cavity and the control cavity are prevented from deforming and cracking under the high-pressure condition, and the use of the excitation device is further influenced.
Preferably, the ignition device is arranged in the gas storage cavity and close to the closed end of the gas storage cavity, so that combustible gas in the gas storage cavity is ignited through the ignition device, energy generated by combustion is released downwards, the blasting plate below is broken instantaneously, gas is released, and seismic waves are generated.
A method of stimulating seismic waves using a deep sea seismic wave stimulation device, comprising the steps of:
A. an ignition device is assembled in the gas storage cavity, a controller, a monitoring device, a power supply device and an ignition machine are assembled in the control cavity, the ignition device is electrically connected with the ignition machine through a connecting wire, the monitoring device is electrically connected with the power supply device through the connecting wire, and the monitoring device, the power supply device and the ignition machine are respectively electrically connected with the controller through the connecting wires;
B. installing a balancing weight on the outer side wall of the opening end of the gas storage cavity, and assembling a blasting plate on the opening end of the gas storage cavity through a third fastening connection flange and a fourth fastening connection flange through a second bolt;
C. assembling an air injection pipe on the closed end of the air storage cavity, assembling a stop valve on one end of the air injection pipe, opening the stop valve, injecting combustible gas and oxygen into the air storage cavity, and closing the stop valve and disconnecting an air source after the gas is injected;
D. the control cavity is connected to the gas storage cavity through a first fastening connecting flange and a second fastening connecting flange through a first bolt;
E. hooking a hanging ring above the control cavity through a crane hook on the test ship, lowering the excitation device to the sea surface, and enabling the excitation device to freely sink in the sea after unhooking;
F. after the monitoring device monitors that the excitation device reaches the preset excitation depth in the sea, when the monitoring device is a timer, the controller can automatically calculate the time of the excitation device sinking to the preset excitation depth according to the sinking speed of the excitation device in the sea and the preset excitation depth, and when the time recorded by the timer is accumulated to the time corresponding to the preset excitation depth, the timer can trigger the controller to control the ignition machine; when the monitoring device is a pressure sensor, the pressure sensor is used for measuring the water pressure of the sea bottom, the controller can acquire the data of the pressure sensor in real time, the preset excitation depth corresponds to the corresponding water pressure, the excitation device reaches the preset excitation depth after the pressure sensor monitors the corresponding water pressure, and the pressure sensor can trigger the controller to control the ignition machine; the igniter can trigger the ignition device to trigger the gas in the gas storage cavity to react immediately after receiving the trigger signal of the controller, high-temperature and high-pressure gas is generated through gas-phase detonation, the high-temperature and high-pressure gas enables the blasting plate to break instantly to release the gas, and accordingly seismic waves are generated.
Preferably, the combustible gas is hydrogen or hydrocarbon gas, so that the combustible gas and the oxygen are conveniently used for gas-phase detonation to excite high-energy generation seismic waves, and an effective high-energy environment-friendly artificial seismic source is provided.
Compared with the prior art, the deep sea seismic wave excitation device and the excitation method have the beneficial effects that:
1. through being provided with ignition in the gas storage cavity to be provided with the controller in the control cavity, monitoring devices, power supply unit and ignition machine, thereby after excitation device transfers to the deep sea, monitoring devices can monitor the depth of water, can trigger the controller and control the ignition machine after reaching the predetermined depth of water, trigger ignition device through the ignition machine simultaneously and explode the gas formation earthquake wave in the gas storage cavity, thereby the effectual problem of having solved the reliable ignition of the seismic source under the thousands of meters water.
2. The mixed gas of combustible gas and oxygen through adopting high initial pressure detonates the mixed gas under certain ignition condition, produce several times local hydraulic detonation pressure, burst the blast plate on the gas storage cavity, release in the water in the twinkling of an eye, form the seismic wave, because the detonation product is steam and a small amount of carbon dioxide, so after the blast plate breaks, the steam natural condensation becomes water, a small amount of carbon dioxide also dissolves in aqueous fast, therefore, the bubble that forms after the gas detonation in the gas storage cavity of excitation device is less, its bubble effect is weak, the initial bubble ratio, and the energy is big, thereby the problem of energy output under the high confining pressure has effectively been solved.
Drawings
FIG. 1 is a schematic structural diagram of a deep sea seismic wave excitation device according to the present invention when the monitoring device is a timer;
fig. 2 is a schematic structural diagram of a deep sea seismic wave excitation device according to the present invention when the monitoring device is a pressure sensor.
In the figure, 1-gas storage cavity, 2-control cavity, 3-blast plate, 4-gas injection pipe, 5-stop valve, 6-ignition device, 7-controller, 8-monitoring device, 9-power supply device, 10-ignition machine, 11-connecting flange I, 12-connecting flange II, 13-bolt I, 14-connecting flange III, 15-connecting flange IV, 16-bolt II, 17-counterweight block, 18-sealing gasket I, 19-sealing gasket II and 20-lifting ring.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 2, the deep and deep sea seismic wave excitation device provided by the invention comprises a cylindrical gas storage cavity 1, one end of the gas storage cavity 1 is open, the other end of the gas storage cavity is closed, a cylindrical control cavity 2 is connected to the closed end of the gas storage cavity 1, one end of the control cavity 2 is open, the other end of the control cavity is closed, the closed end of the gas storage cavity 1 is connected to the open end of the control cavity 2, the cross section of the gas storage cavity 1 has the same size as that of the cross section of the control cavity 2, the open end of the gas storage cavity 1 is connected to a bursting plate 3, the closed end of the gas storage cavity 1 is provided with a gas injection pipe 4, one end of the gas injection pipe 4 extends into the gas storage cavity 1, the gas injection pipe 4 penetrates through the closed end of the gas storage cavity 1 to be sealed, and the other end of the gas injection pipe is provided with a stop valve 5, set up stop valve 5 in gas injection pipe 4 be located one section of gas storage cavity 1 outside, be provided with ignition 6 in the gas storage cavity 1, be provided with controller 7, monitoring devices 8, power supply unit 9 and lighter 10 in the control cavity 2, monitoring devices 8, power supply unit 9 and lighter 10 are connected with controller 7 electricity respectively, ignition 6 is connected with lighter 10 electricity, monitoring devices 8 is connected with power supply unit 9 electricity, monitoring devices 8 is time-recorder or pressure sensor
As shown in fig. 1 and 2, in the deep and deep sea seismic wave excitation device provided by the invention, a first connecting flange 11 is arranged on the closed end of a gas storage cavity 1, a second connecting flange 12 matched with the first connecting flange 11 is arranged on the open end of a control cavity 2, the first connecting flange 11 and the second connecting flange 12 are fastened and connected through a first bolt 13, a third connecting flange 14 is arranged on the open end of the gas storage cavity 1, a fourth connecting flange 15 matched with the third connecting flange 14 is arranged on the side wall of a blast plate 3, the third connecting flange 14 and the fourth connecting flange 15 are fastened and connected through a second bolt 16, corresponding through holes are formed in the first connecting flange 11 and the second connecting flange 12, and then the first bolt 13 penetrates through the through holes to fasten and connect the first connecting flange 11 and the second connecting flange 12, so as to connect the gas storage cavity 1 and the control cavity 2, and simultaneously, corresponding through holes are formed in the third connecting flange 14 and the fourth connecting flange 15, and then bolts 16 penetrate through the through holes to be tightly connected with the third connecting flange 14 and the fourth connecting flange 15, so that the gas storage cavity 1 and the blasting plate 3 are connected. Be provided with a plurality of fixes being annular balancing weights 17 on gas storage cavity 1 outer wall on gas storage cavity 1's the open end, be cyclic annular with balancing weights 17 design to with balancing weights 17 suit on gas storage cavity 1's open end, make the weight of gas storage cavity 1 open end be greater than the weight of its blind end, can guarantee excitation device vertical whereabouts like this after transferring excitation device, make excitation device's blasting plate be located the below, thereby can stimulate the earthquake wave in the deep sea downwards. A lifting ring 20 is arranged on the closed end of the control cavity 2. A first sealing washer 18 is arranged between the first connecting flange 11 and the second connecting flange 12, the first sealing washer 18 is arranged to be annular and keeps consistent with the shape and size of the first connecting flange 11 and the second connecting flange 12, meanwhile, a through hole is also formed in the first sealing washer 18, so that a first bolt 13 can pass through the through hole, the first sealing washer 18 is arranged between the first connecting flange 11 and the second connecting flange 12 and seals the first connecting flange 11 and the second connecting flange 12, a second sealing washer 19 is arranged between the third connecting flange 14 and the fourth connecting flange 15, the second sealing washer 19 is arranged to be annular and keeps consistent with the shape and size of the third connecting flange 14 and the fourth connecting flange 15, and a through hole is also formed in the second sealing washer 19, so that a second bolt 16 can pass through the through hole, and the second sealing washer 19 is arranged between the third connecting flange 14 and the fourth connecting flange 15 and seals the second, the first sealing washer 18 and the second sealing washer 19 are metal sealing rings and rubber sealing rings which are combined sealing structures. The explosion plate 3 is hemispherical and made of special steel, and the size of the semicircular surface of the explosion plate is the same as that of the cross section of the gas storage cavity 1. The material of the gas storage cavity 1 and the material of the control cavity 2 are both special steel with the yield strength of more than 900 MPa. The ignition device 6 is arranged in the gas storage cavity 1 and close to the closed end of the gas storage cavity 1.
The invention also provides a method for exciting seismic waves by using the deep and distant sea seismic wave excitation device, which comprises the following steps: A. an ignition device 6 is assembled in a gas storage cavity 1, a controller 7, a monitoring device 8, a power supply device 9 and an igniter 10 are assembled in a control cavity 2, the ignition device 6 is electrically connected with the igniter 10 through a connecting wire, the connecting wire connecting the ignition device 6 with the igniter 10 is sealed at the closed end penetrating through the gas storage cavity 1, the monitoring device 8 is electrically connected with the power supply device 9 through the connecting wire, and the monitoring device 8, the power supply device 9 and the igniter 10 are respectively electrically connected with the controller 7 through the connecting wire; B. installing a balancing weight 17 on the outer side wall of the opening end of the gas storage cavity 1, and fastening a connecting flange III 14 and a connecting flange IV 15 through a bolt II 16 to assemble the blasting plate 3 on the opening end of the gas storage cavity 1; C. assembling an air injection pipe 4 on the closed end of the air storage cavity 1, assembling a stop valve 5 on one end of the air injection pipe 4, opening the stop valve 5, injecting combustible gas and oxygen into the air storage cavity 1, closing the stop valve 5 after the gas injection is finished, and disconnecting an air source; D. the control cavity 2 is connected to the gas storage cavity 1 through a first bolt 13 and a second connecting flange 12 which are fastened; E. hooking a lifting ring 20 above the control cavity 2 through a crane lifting hook on the test ship, lowering the excitation device to the sea surface, and enabling the excitation device to freely sink in the sea after unhooking; F. after the monitoring device 8 monitors that the excitation device reaches the preset excitation depth in the sea, when the monitoring device 8 is a timer, the controller 7 can automatically calculate the time for the excitation device to sink to the preset excitation depth according to the sinking speed of the excitation device in the sea and the preset excitation depth, and when the time recorded by the timer is accumulated to the time corresponding to the preset excitation depth reached by the excitation device, the timer can trigger the controller 7 to control the ignition machine 10; when the monitoring device 8 is a pressure sensor, the pressure sensor is used for measuring the water pressure of the sea bottom, the controller 7 can acquire the data of the pressure sensor in real time, the preset excitation depth corresponds to the corresponding water pressure, the excitation device reaches the preset excitation depth after the pressure sensor monitors the corresponding water pressure, and the pressure sensor can trigger the controller 7 to control the igniter 10; the igniter 10 receives the trigger signal of the controller 7 and immediately triggers the ignition device 6 to initiate the gas in the gas storage cavity 1 to react, high-temperature and high-pressure gas is generated through gas-phase detonation, the high-temperature and high-pressure gas enables the blast plate 3 to be instantaneously broken to release the gas, and accordingly, seismic waves are generated.
As shown in fig. 1, a monitoring device 8 in a deep and offshore seismic wave excitation device is a timer, according to the sinking speed and the preset excitation depth of the excitation device in the sea, a controller 7 can automatically calculate the time of the excitation device sinking to the preset excitation depth, when the time recorded by the timer is accumulated to the time corresponding to the preset excitation depth, the timer can trigger the controller 7 to control an igniter 10, and the igniter 10 can immediately trigger the igniter 6 to trigger the gas in the gas storage cavity 1 to react after receiving a trigger signal of the controller 7, and generate high-temperature and high-pressure gas through gas-phase detonation, so that the blast plate 3 is instantaneously ruptured by the high-temperature and high-pressure gas to release the gas, thereby generating the seismic wave.
As shown in fig. 2, a monitoring device 8 in a deep and offshore seismic wave excitation device is a pressure sensor, the pressure sensor is embedded and installed on a shell of a control cavity 2, the pressure sensor is embedded and installed at the position of the control cavity 2 for sealing, and a pressure measuring surface of the pressure sensor is arranged outside the control cavity 2, so that the pressure of the sea bottom can be measured through the pressure sensor, a controller can acquire data of the pressure sensor in real time, the data correspond to the corresponding sea bottom depth after reaching a certain water pressure, the excitation device is lowered to a preset excitation depth, that is, the controller 7 can be triggered by the pressure sensor to control an igniter 10 after reaching the preset excitation depth, and meanwhile, after receiving a trigger signal of the controller 7 through the igniter 10, the igniter 6 can be triggered to trigger a gas in a gas storage cavity 1 to react, and high-temperature and high-pressure gas is generated through gas phase detonation, the high temperature and high pressure gas instantaneously ruptures the rupture plate 3 to release the gas, thereby generating a seismic wave.
Wherein the combustible gas may be one of hydrogen, methane, propane or acetylene.
When the combustible gas is hydrogen, the reaction equation of hydrogen and oxygen is as follows:
2Hg+Og→HOg ΔH＝-242kJ/mol
that is, 1 mole of hydrogen reacted with equivalent oxygen released 242 kj of energy and produced 18 times the initial pressure of product gas under detonation conditions.
When the combustible gas is methane, the reaction equation of the methane and the oxygen is as follows:
CHg+2Og→COg+2HOg ΔH＝-802kJ/mol
that is, 1 mole of methane reacts with equivalent oxygen to release 802 kilojoules of energy and produce 27 times the initial pressure of product gas under detonation conditions.
Because the chemical energy released by gas reaction is utilized, the energy density is far higher than that of compressed gas under the same initial pressure, so that higher gas release pressure can be obtained under lower gas injection pressure, and the combustible gas and oxygen can be utilized to carry out gas-phase detonation to excite high-energy seismic waves in the sea area below 4000-6000 meters in the deep and far sea, thereby providing an effective high-energy environment-friendly artificial seismic source for geophysical exploration of the seabed in the deep and far sea.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. A deep and distant sea seismic wave excitation device is characterized in that: including being columniform gas storage cavity (1), the one end of gas storage cavity (1) is the opening form, and its other end is for sealing the form, be connected with on the closed end of gas storage cavity (1) and be columniform control cavity (2), the one end of control cavity (2) is the opening form, and its other end is for sealing the form, the blind end of gas storage cavity (1) is connected with the open end of control cavity (2), be connected with rupture panel (3) on the open end of gas storage cavity (1), be provided with gas injection pipe (4) on the closed end of gas storage cavity (1), the one end of gas injection pipe (4) stretches into to the inside of gas storage cavity (1), is provided with stop valve (5) on its other end, be provided with ignition (6) in gas storage cavity (1), be provided with controller (7), monitoring devices (8) in control cavity (2), Power supply unit (9) and ignition machine (10), monitoring devices (8), power supply unit (9) and ignition machine (10) are connected with controller (7) electricity respectively, ignition (6) are connected with ignition machine (10) electricity, monitoring devices (8) are connected with power supply unit (9) electricity, monitoring devices (8) are time-recorder or pressure sensor.
2. The deep sea seismic wave excitation device according to claim 1, wherein: be provided with flange one (11) on the closed end of gas storage cavity (1), be provided with on the open end of control cavity (2) with flange one (11) matched with flange two (12), flange one (11) and flange two (12) are through bolt one (13) fastening connection, be provided with flange three (14) on the open end of gas storage cavity (1), be provided with on the lateral wall of blast plate (3) with flange three (14) matched with flange four (15), flange three (14) and flange four (15) are through bolt two (16) fastening connection.
3. A deep sea seismic wave excitation device according to claim 1 or 2, wherein: the opening end of the air storage cavity (1) is provided with a plurality of annular balancing weights (17) fixed on the outer wall of the air storage cavity (1).
4. The deep sea seismic wave excitation device according to claim 1, wherein: and a lifting ring (20) is arranged at the closed end of the control cavity (2).
5. The deep sea seismic wave excitation device according to claim 2, wherein: a first sealing washer (18) is arranged between the first connecting flange (11) and the second connecting flange (12), a second sealing washer (19) is arranged between the third connecting flange (14) and the fourth connecting flange (15), and the first sealing washer (18) and the second sealing washer (19) are metal sealing rings and rubber sealing ring composite sealing structures.
6. The deep sea seismic wave excitation device according to claim 1, wherein: the blasting plate (3) is hemispherical and is made of special steel.
7. A deep sea seismic wave excitation device according to claim 1 or 2, wherein: the material of the gas storage cavity (1) and the material of the control cavity (2) are both special steel with the yield strength of more than 900 MPa.
8. The gas explosion seismic source timed ignition excitation device of claim 1, characterized in that: the ignition device (6) is arranged in the gas storage cavity (1) and close to the closed end of the gas storage cavity (1).
9. A method of exciting seismic waves using a deep sea seismic wave excitation device as claimed in any one of claims 1 to 8, comprising the steps of:
A. an ignition device (6) is assembled in a gas storage cavity (1), a controller (7), a monitoring device (8), a power supply device (9) and an ignition machine (10) are assembled in a control cavity (2), the ignition device (6) is electrically connected with the ignition machine (10) through a connecting wire, the monitoring device (8) is electrically connected with the power supply device (9) through the connecting wire, and the monitoring device (8), the power supply device (9) and the ignition machine (10) are respectively electrically connected with the controller (7) through the connecting wire;
B. mounting a balancing weight (17) on the outer side wall of the opening end of the gas storage cavity (1), and fastening and connecting a third flange (14) and a fourth connecting flange (15) through a second bolt (16) to assemble the blasting plate (3) on the opening end of the gas storage cavity (1);
C. assembling a gas injection pipe (4) on the closed end of the gas storage cavity (1), assembling a stop valve (5) on one end of the gas injection pipe (4), opening the stop valve (5), injecting combustible gas and oxygen into the gas storage cavity (1), closing the stop valve (5) after the gas injection is finished, and disconnecting a gas source;
D. the control cavity (2) is connected to the gas storage cavity (1) through a first bolt (13) and a second connecting flange (12) which are fastened;
E. hooking a lifting ring (20) above the control cavity (2) through a crane lifting hook on the test ship, lowering the excitation device to the sea surface, and enabling the excitation device to freely sink in the sea after unhooking;
F. after the excitation device is monitored to reach the preset excitation depth in the sea through the monitoring device (8), when the monitoring device (8) is a timer, the controller (7) can automatically calculate the time when the excitation device sinks to the preset excitation depth according to the sinking speed of the excitation device in the sea and the preset excitation depth, and when the time recorded by the timer is accumulated to the time corresponding to the preset excitation depth reached by the excitation device, the timer can trigger the controller (7) to control the ignition machine (10); when the monitoring device (8) is a pressure sensor, the pressure sensor is used for measuring the water pressure of the sea bottom, the controller (7) can collect the data of the pressure sensor in real time, the preset excitation depth corresponds to the corresponding water pressure, the excitation device reaches the preset excitation depth after the pressure sensor monitors the corresponding water pressure, and the pressure sensor can trigger the controller (7) to control the igniter (10); the igniter (10) can immediately trigger the ignition device (6) to trigger gas in the gas storage cavity (1) to react after receiving a trigger signal of the controller (7), high-temperature and high-pressure gas is generated through gas phase detonation, and the high-temperature and high-pressure gas enables the bursting plate (3) to be instantaneously broken to release the gas, so that seismic waves are generated.
10. The method of deep open sea excitation seismic waves of claim 9, wherein: the combustible gas is hydrogen or hydrocarbon gas.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023103221A1 (en) * | 2021-12-08 | 2023-06-15 | 中国石油集团东方地球物理勘探有限责任公司 | Full-wave-field seismic source apparatus based on gas explosion technology, and seismic source data acquisition method |
| CN117055096A (en) * | 2023-10-11 | 2023-11-14 | 煤炭科学研究总院有限公司 | Pneumatic drop hammer type vibration source excitation device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023103221A1 (en) * | 2021-12-08 | 2023-06-15 | 中国石油集团东方地球物理勘探有限责任公司 | Full-wave-field seismic source apparatus based on gas explosion technology, and seismic source data acquisition method |
| US20240085581A1 (en) * | 2021-12-08 | 2024-03-14 | Bgp Inc., China National Petroleum Corporation | Devices for full-wave field seismic source based on gas explosion technologies and methods for acquiring seismic data |
| CN117055096A (en) * | 2023-10-11 | 2023-11-14 | 煤炭科学研究总院有限公司 | Pneumatic drop hammer type vibration source excitation device |
| CN117055096B (en) * | 2023-10-11 | 2023-12-26 | 煤炭科学研究总院有限公司 | Pneumatic drop hammer type vibration source excitation device |
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