KR101947326B1 - Seismic exploration device including self-buoyant seismic exploration module and seismic exploration method using the same - Google Patents

Abstract

The present invention relates to an elastic wave exploration device, comprising: an elastic wave generation unit towed from the stern of a ship; and a self-buoyant elastic wave exploration module towed at the tail of the elastic wave generation unit and receiving the elastic waves reflected from the seabed, wherein the self-buoyant elastic wave exploration module includes: a receiving unit positioned to be immersed under the surface of the water and to receive the elastic waves reflected from the seabed; and a buoyancy unit connected to the receiving unit via a connection unit and providing buoyancy for immersing the receiving unit under the surface of the water, the receiving unit includes: a receiving housing having an inside space for holding water; a hole formed on the receiving housing for inflow and outflow of external water; and at least one receiver installed at a lower part of the receiving housing, and the buoyancy housing includes; a buoyancy housing having an inside space for holding a buoyancy body; and a connection rod insertion hole formed on a side surface of the buoyancy housing. The present invention ensures robustness against a rolling phenomenon on the surface of the sea.

Description

[0001] SEISMIC EXPLORATION DEVICE INCLUDING SELF-BUOYANT SEISMIC EXPLORATION MODULE AND SEISMIC EXPLORATION [0002] METHOD USING THE SAME [0003] Technical Field [0004] [1]

The present invention relates to a seismic exploration system including a self-buoyant seismic exploration module capable of stably performing three-dimensional surveys in coastal waters.

Recently, the demand for high quality marine geotechnical information in the coastal area has been increasing as economic activities such as offshore wind farms and ocean pier construction are increasing in the coastal waters.

In general, oceanographic information is obtained through seismic surveys. Seismic surveys are performed by installing a sound source unit and a receiver unit on a ship. In other words, it is possible to generate seismic waves in the sound source unit during the voyage of the ship, and the generated seismic waves are reflected from the seabed to reach the water depths, and analyze the received signals to acquire the ocean floor information.

The seismic exploration system can be divided into two dimensional survey and three dimensional survey.

The two-dimensional survey is performed using a single streamer in which at least one water column is arranged in the direction of the ship's sailing.

In contrast, 3D exploration is performed using multiple lines of streamers. Especially, 3D surveying has the advantage that it can image more complicated structures than 2D surveying, but it has been performed mainly in large ships because many equipment needs to be lifted.

However, exploration using large vessels is very limited in coastal waters. In the case of large geophysical probes, normal three-dimensional exploration is possible only at depths exceeding 20m, considering 6 ~ 7m draft and airgun, streamer, etc. In other words, a seismic exploration system that can be used in small ships is also needed so that 3-D surveys can be carried out in coastal areas with depths of 2 to 20 m.

However, in the previous article "VHR Marine 3D Seismics for Shallow Water Investigations: Some Practical Guidelines (Springer 2005. Tine Missiaen)", three-dimensional seismic surveys were performed on rivers and coasts by installing streamers on small vessels. In the coastal area, the spacing between streamers is not constant during the survey process, so that it fails to obtain precise 3D seismic images.

In order to solve such a problem, Korean Patent Registration No. 10-1605406 has provided an apparatus using a block-type frame in which the position of a water sample is fixed. However, in the above surveying apparatus, a buoyancy board portion was provided at the upper part of the water block portion composed of the frame to provide buoyancy that the water block was submerged in the lower part of the sea surface. The probe having such a structure has a high center of gravity, Rolling phenomenon, that is, it is vulnerable to the phenomenon of rocking to the left and right

On the other hand, in the case of Korean Patent No. 10-1591753, there is also provided a seismic fixation apparatus for a small ship including a structure in which the relative position between the buoyancy resisting boards is constant. However, the above surveying apparatus is still made of reinforced plastic for the waterproof housing, and the center of gravity is still high, which is a problem in that it is vulnerable to the rolling phenomenon at the sea level.

SUMMARY OF THE INVENTION The present invention provides a self-buoyant type seismic exploration module and a seismic exploration system including the same, which is robust against the rolling phenomenon at sea level, and has a structure capable of securing stability of exploration.

On the other hand, other unspecified purposes of the present invention will be further considered within the scope of the following detailed description and easily deduced from the effects thereof.

According to an aspect of the present invention, there is provided a self-buoyant type seismic wave surveying apparatus comprising: an elastic wave generating unit towed at the rear of a ship; And a self-buoyant type seismic wave exploration module towed at the rear of the seismic wave generator and reflected at the bottom of the sea, wherein the self buoyant seismic wave exploration module is positioned so as to be submerged below the sea surface, A watertight unit; And a buoyancy unit coupled to the water depth unit via a connection unit and providing a buoyancy force to lock the water depth unit below the sea level, wherein the water depth unit comprises: ; An outflow inlet formed in the susceptor housing and through which water flows in and out; And a buoyancy housing having at least one buoyancy unit installed at a lower portion of the susceptor housing, the buoyancy unit having a space capable of accommodating a buoyancy body therein; And a connecting rod insertion port formed on a side surface of the buoyancy housing.

In one example, the connecting portion may have a plate shape protruding outward from the susceptor housing and the buoyancy housing.

In one example, the susceptor housing may further include a truncated cone-shaped sucker mounting portion protruding inwardly and having a smaller diameter in an inward direction. In this case, it is preferable to further include a catcher case and a catcher cover which are installed at one end of the catcher installation hole, and the catcher cover is formed at an inner lower portion of the catcher case to prevent the catcher from being detached outwardly, And a screw hole is formed in an upper portion of the screw hole, and when the screw hole is engaged with the screw hole case, the screw hole installed in the screw hole case can be pressed and fixed.

In one example, the plurality of water jets may be arranged in a line from the head to the stern.

In one example, by inserting a connecting rod into the connecting rod insertion port, the self-buoyant type seismic wave exploration module or the auxiliary buoyancy module can be connected in a direction perpendicular to the traveling direction of the ship to be further expanded. In the case where the self buoyant type seismic wave exploration module is extended to a plurality of the plurality of self buoyant type seismic wave exploration modules through a connecting rod, a GPS is installed only in one or two self buoyant type seismic exploration modules, And acquires position information of each of the self-buoyant seismic exploration modules.

According to another aspect of the present invention, there is provided a method of searching for seismic waves according to another embodiment of the present invention, including the steps of providing the seismic wave detecting apparatus, connecting the seismic wave generating unit and the seismic exploration module to a ship, And filling the water through the outflow inlet of the water immersion unit during a period of time of the waterproof unit; Receiving and propagating the elastic wave generating unit and the seismic wave sensing module to generate a seismic wave at the bottom of the seismic wave generating unit and receiving the three-dimensional seismic waves reflected from the seabed surface at the seismic wave sensing module; And an elastic wave analysis step of processing the received elastic waves to obtain marine ground information.

The self buoyant type seismic wave exploration module according to an embodiment of the present invention is configured to allow water to flow in and out of the sink unit so that the center of gravity of the seismic exploration module is absorbed by the water introduced into the sink unit during the survey, It is possible to secure robustness against the rolling phenomenon at the sea surface.

Further, since the water is introduced into the water-resistant unit, the entire water-leveler provided inside the water-resistant unit can be stabilized in water, and the transmission rate of sound waves can be increased.

Meanwhile, since the inner side of the residence unit is an empty space in the movement and installation process of the seismic wave exploration module, it is advantageous in that it can be moved and installed more easily.

On the other hand, even if the effects are not explicitly mentioned here, the effect described in the following specification, which is expected by the technical features of the present invention, and its potential effects are treated as described in the specification of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an elastic wave surveying apparatus including a self-buoyant type seismic wave exploration module according to an embodiment of the present invention.
2 is a schematic perspective view of an elastic wave exploration module according to an embodiment of the present invention.
3 is a schematic exploded perspective view of an elastic wave exploration module according to an embodiment of the present invention.
4 is a schematic enlarged cross-sectional view of a portion where a water jug is installed in an example of the present invention.
5 is a schematic flow chart of a seismic wave exploration method according to another example of the present invention.
* The accompanying drawings illustrate examples of the present invention in order to facilitate understanding of the technical idea of the present invention, and thus the scope of the present invention is not limited thereto.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention.

On the other hand, the coastal area refers to shallow sea within the continental shelf with a depth of about 130 ~ 200m in natural geography, but it may be defined differently depending on the field. Therefore, in the present invention, the sea area is defined as a concept related to the operation of the probe line and the acoustic wave source rather than the dictionary definition, and the sea area of 2 ~ 20m depth is defined as the sea area where the large ship can not be utilized for seismic exploration.

1 is a schematic diagram of a seismic wave exploration apparatus including a self-buoyant type seismic wave exploration module 100 according to an embodiment of the present invention.

1, in an embodiment of the present invention, the seismic wave surveying apparatus includes an elastic wave generating unit 2 towed at the rear of a ship 1 and a self-buoyant type seismic wave exploration module 2 towed at the tail of the elastic wave generating unit 2 100).

A reference GPS for providing a reference position of the seismic wave detecting device may be installed in the ship 1 or the elastic wave generating part 2. [ In particular, the reference GPS installed in the seismic wave generating unit 2 can be used for the seismic wave analysis by acquiring the positional information of the seismic wave generating unit 2 while performing the seismic wave survey for the seabed topography.

The elastic wave generating portion 2 is configured to generate an elastic wave for obtaining marine ground information such as a seabed topography. For example, the elastic wave generating unit 2 may generate a seismic wave using an air gun, a boomer, a sparker, a sub-bottom profilers (SBP), a chirp signal generator, or the like .

The elastic wave generated in the elastic wave generating part 2 is reflected on the bottom surface and then becomes a receiver installed in the self-buoyant type elastic wave exploration module 100.

Generally, the seismic survey is performed by analyzing the propagation velocity and the waveform of the seismic wave to obtain the information of the ocean floor. The position of the seismic exploration module 100 is changed regularly or irregularly due to the rolling phenomenon of the ship. Especially, in coastal coastal area, sea surface disturbance becomes worse than deep sea region due to the effect of sea floor.

Conventionally, signal distortion due to rolling phenomenon has been rearranged through various signal processing methods. However, if the signal can be received stably during the probe process, more accurate probe will be possible.

Therefore, the seismic wave detecting apparatus of one embodiment of the present invention can receive signals more stably in the process of exploration using the seismic wave exploration module described later.

FIG. 2 is a schematic perspective view of an elastic wave exploration module according to an embodiment of the present invention, and FIG. 3 is a schematic exploded perspective view of an elastic wave exploration module according to an embodiment of the present invention.

Referring to FIGS. 2 and 3, the structure and function of the elastic wave exploration module 100 according to an embodiment of the present invention will be described.

The elastic wave exploration module 100 according to an embodiment of the present invention includes a water retention unit 10 and a buoyancy unit 30.

The water-retaining unit 10 is positioned so as to be submerged below the sea surface during the exploration process, and serves to recover the elastic waves reflected from the seabed.

To this end, the buoyancy unit 30 may be coupled through the connection of the watering unit 10 and the connection 50 to provide a buoyancy to submerging the watering unit below the sea level.

The waterproof unit (10) includes a water resistant housing (11) having a space (13) capable of receiving water therein. The seismic wave exploration module 100 of the present invention can receive water in the space 13 of the resilient housing 11 during the probe process and lower the center of gravity of the seismic exploration module 100. Accordingly, it is possible to reduce the distortion of the signal received due to the rolling phenomenon in the exploration process using the elastic wave exploration module 100.

 However, the water contained in the space 13 of the water housing 11 must flow into the exploration process for convenience in moving and installing the seismic exploration module 100. In order to lower the center of gravity, the weight of the stay unit 10 itself or the weight of a separate weight is wasted in terms of manpower and cost. Especially in the case of small vessels. To this end, an outflow inlet 15 is formed in the housing housing 11 of the present invention. The outflow inlet 15 can be arranged in a plurality of ways so that the inflow and outflow of water are free.

The shape of the housing housing 11 may be a shape in which the line width gradually widens from the head to the stern like the head shape of the exploration vessel in order to advance straight ahead in the course of the exploration.

A female housing (20) may be disposed below the female housing (11).

4 is a schematic enlarged cross-sectional view of the water jug holder 20;

Referring to FIG. 4, a truncated cone-shaped instrument mounting hole 17 may be formed in the lower portion of the water receiving housing 11 so as to protrude inward, that is, in the direction of the space 13. At this time, the water conditioner 21 is disposed at one end of the water conditioner installation port 17, and it is possible to prevent the noise other than the signal reflected from the sea surface from flowing into the water conditioner 21 due to the shape of the water conditioner installation port 17 .

On the other hand, the water conditioner 21 can be installed inside the water conditioner case 22. In order to prevent the water jug 21 from being released to the outside, a separation preventing jaw 23 is formed on the inner lower side of the water jug case 22.

A stapler cover 24 is disposed at an upper portion of the stapler case 22 for fixing the stapler 21 and the stapler cover 24 can be screwed with the stapler case 22 to pressurize and fix the stapler 21 . In addition, a water receptor exposure hole 25 is disposed in the upper part of the water detector case 22. The water introduced into the space 13 of the water housing 11 through the water hole exposure hole 25 and the water outside the water housing 11 are maintained in a state of being totally immersed in the water to improve the sound wave transmission rate .

In addition, unexpected errors due to changes in water, temperature, and the like can be minimized since the water in the location where the probe is to be performed is introduced into the space 13 of the water receiving housing 11 through the outflow inlet 15.

In one example of the present invention, the water conditioners 21 may be arranged in a line in a line from the head to the aft direction, for example, three as shown in the figure.

The water jug 21 may be, but is not limited to, a directional hydrophone or an Omni hydrophone.

On the other hand, the resilient unit 10 of the elastic wave exploration module 100 of the present invention receives buoyancy from the buoyancy unit 30.

To this end, the buoyancy unit (30) includes a buoyancy housing (31) capable of receiving a buoyant body therein. At this time, the buoyant body has buoyancy that can float on the water, and air or styrofoam can be used.

The buoyancy housing 31 may also have a shape in which the line width gradually widens from the head to the aft direction, such as the head shape of the exploration vessel, in order to advance straight forward in the exploration process as in the case of the above-

A connecting rod insertion port 35 is formed on the side surface of the buoyancy housing 31. The connecting rod C may be inserted and fixed to the connecting rod insertion port 35. The additional elastic wave exploration module 100 may be inserted through the connecting rod C in a direction perpendicular to the traveling direction of the ship 1, Additional extensions are available.

Alternatively, it is possible to further expand the auxiliary buoyancy module instead of the additional seismic exploration module 100. In the course of the exploration, it is necessary to adjust the depth at which the survey is performed. In the elastic wave surveying apparatus of the present invention, an auxiliary buoyancy module may be added to adjust the depth at which the survey is performed.

Or the stability buoyancy module may be used to increase the stability of the seismic exploration module 100. It is possible to increase the rigidity of the rolling phenomenon by increasing the length of the entire elastic wave exploration module 100 in the direction perpendicular to the traveling direction of the ship 1 by using the auxiliary buoyancy module.

A plurality of connecting rod insertion ports 35 may be disposed in the buoyancy housing 31, but the present invention is not limited thereto. That is, a sufficient number of connecting rod insertion ports 35 for fixing adjacent modules can be formed. Likewise, the connecting rod C can be arranged not in a straight line but in an intersecting manner. However, since the connecting rod C is positioned above the sea surface, it is possible to prevent unnecessary resistance from being generated during the probe process.

 A communication connector 37 and a signal connector 39 may be disposed above the buoyancy housing 31. The communication unit 71 is coupled to the communication installation port 37 by a mounting rod 72. The communication unit 71 may include a GPS that can confirm the location where the probe is performed, and may further include Bluetooth capable of short-range communication. The GPS or the Bluetooth of the communication unit 71 can transmit and receive the respective information through the antenna 73. [

The seismic wave detecting apparatus according to the embodiment of the present invention does not require the communication unit 71 to be installed in the communication installation port 37 of all the elastic wave wave exploration module 100 but only a part of the plurality of elastic wave wave exploration modules 100, The location of all of the seismic exploration module 100 can be confirmed by installing a plurality of seismic reflection probes 71. Preferably, only one acoustic wave exploration module 100 is provided with a communication unit 71 so that the positions of all the acoustic wave exploration modules 100 can be confirmed. This is because each of the elastic wave exploration modules 100 is located at a predetermined distance from each other by the connecting rod C as described above.

On the other hand, the water depth unit 10 and the buoyancy unit 30 are connected through the connection unit 50. For example, the water retaining unit 10 and the buoyancy unit 30 can be flanged through the connecting portion 50.

The connecting portion 50 may be in the form of a plate protruding outward from the susceptor housing 11 and the buoyancy housing 31. That is, the connecting portion 50 may have a plate shape, and the connecting portion 50 may serve as a horizontal wing during operation of the seismic exploration module 100 to reduce the rolling phenomenon of the seismic exploration module 100.

In addition, an auxiliary buoyant body is additionally connected to the connecting portions 50 on both sides of the seismic exploration module 100, so that the two-dimensional seismic exploration can be stably performed by one seismic exploration module 100.

In the seismic wave exploration apparatus according to an embodiment of the present invention, one seismic wave exploration module 100 has buoyancy itself, but water is inflowed in the process of installing the survey apparatus inside the water depth unit 10 to lower the center of gravity There is an effect of reducing the rolling phenomenon.

Further, the elastic wave exploration module 100 can be further expanded using the connecting rod C, and the depth at which the measurement is performed can be adjusted using the auxiliary buoyancy module.

Hereinafter, a method of exploring a seismic wave using the seismic wave detecting apparatus according to an embodiment of the present invention will be described.

5 is a schematic flow diagram of a seismic wave exploration method (M100) according to another embodiment of the present invention.

Referring to FIG. 5, the elastic wave method M100 according to another embodiment of the present invention includes a step of installing a seismic wave detecting device (S10), an elastic wave transmitting and receiving step (S20), and an elastic wave analysis step (S30).

First, the step of installing a seismic wave detecting device (S10) carries out a step (S11) of providing the above-mentioned seismic wave detecting device of one embodiment of the present invention. In this case, when the seismic survey is performed in multiple channels, the seismic exploration modules are connected and fixed to each other by using a connecting rod. Next, a step S12 is performed in which the seismic wave generating unit and the seismic wave exploration module are connected to the ship and floated on the sea surface. Then, the watering unit is filled with water through the outflow inlet for a predetermined time (S13).

In the elastic wave transmission and reception step S20, as the ship advances, a process of towing the elastic wave generation unit and the elastic wave detection module, generating the elastic wave in the bottom surface of the elastic wave, and receiving the elastic elastic wave in the bottom surface, . At this time, the position of the entire seismic exploration module can be obtained through the communication unit provided in any one of the plurality of seismic exploration modules.

The acoustic wave analysis step S30 may be performed by a method of extracting and analyzing only the necessary information through a signal processing process such as removal of influence by wave, noise removal and filtering in order to acquire marine ground information.

The scope of protection of the invention is not limited to the description and the expression of the embodiments explicitly described in the foregoing. It is again to be understood that the present invention is not limited by the modifications or substitutions that are obvious to those skilled in the art.

Claims (8)

An elastic wave generating unit towed at the rear of the ship; And
And a self-buoyant type seismic wave exploration module towed at the back of the seismic wave generating part,
The self-buoyant seismic exploration module comprises:
A water immersion unit positioned below the sea surface so as to sink the elastic waves reflected from the sea floor; And
And a buoyancy unit coupled through the connection unit to the buoyancy unit and providing a buoyancy force to lock the buoyancy unit below the sea level,
Wherein,
A water resistant housing having a space capable of receiving water therein;
An outflow inlet formed in the susceptor housing and through which water flows in and out; And
And a stirrer installed at a lower portion of the susceptor housing,
The buoyancy unit comprises:
A buoyancy housing having a space capable of accommodating the buoyant body therein; And
And a connecting rod insertion port formed on a side surface of the buoyancy housing.
The method according to claim 1,
Wherein the connecting portion is in the form of a plate protruding outwardly from the susceptor housing and the buoyancy housing.
The method according to claim 1,
Further comprising a truncated cone-shaped instrument mounting hole protruding inwardly and having a smaller diameter in an inward direction than a lower portion of the water receiving housing.
The method of claim 3,
Further comprising a water-jug case and a water-jug lid provided at one end of the water-
A bailout preventing jaw is formed at an inner lower portion of the water jugger case to prevent the water jugger from being detached to the outside,
Wherein the watercourse cover is formed with an exposing hole on an upper portion thereof and is screwed with the watercounting case so that the watercounting device installed in the watercounting case can be pressed and fixed when engaged.
The method according to claim 1,
Wherein a plurality of the water depth sensors are arranged in a line in the aft direction from the head.
The method according to claim 1,
Wherein the self-buoyant type seismic wave exploration module or the auxiliary buoyancy module is connected in a direction perpendicular to the traveling direction of the ship by inserting the connecting rod into the connecting rod insertion port.
The method according to claim 6,
In the case where the self-buoyant type seismic exploration module is extended to a plurality of through the connecting rod,
Wherein the location information of each of the plurality of self-buoyant seismic exploration modules is acquired by installing GPS only on one or two self-buoyant seismic exploration modules of the plurality of self-buoyant seismic exploration modules.
The method of claim 1, further comprising the steps of: providing the seismic wave surveying apparatus of any one of claims 1 to 7; connecting the seismic wave generating unit and the self-buoyant seismic exploration module to a ship and floating on the sea surface; Installing a seawater probe device including filling the water through an outflow inlet;
A step of propagating the ship to propel the seismic wave generating unit and the self buoyant seismic wave exploration module, generating the seismic waves from the seismic wave generating unit at the seabed surface, and receiving the three-dimensional seismic wave reflected from the seabed surface by the self buoyant seismic exploration module ; And
And a seismic analysis step of subjecting the received elastic waves to signal processing to obtain marine ground information.

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