CN105277971A - Micro-seismic monitoring system and method - Google Patents
Micro-seismic monitoring system and method Download PDFInfo
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- CN105277971A CN105277971A CN201510673600.9A CN201510673600A CN105277971A CN 105277971 A CN105277971 A CN 105277971A CN 201510673600 A CN201510673600 A CN 201510673600A CN 105277971 A CN105277971 A CN 105277971A
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Abstract
The invention discloses a micro-seismic monitoring system and method. The micro-seismic monitoring system comprises an optical fiber sensing device and a data acquisition device, wherein the optical fiber sensing device and the data acquisition device are connected with each other. The optical fiber sensing device can be laid on the ground and/or arranged underground, and is used for transmitting a laser signal emitted into an optical fiber and transmitting a reflection laser signal of each point of the inner wall of the optical fiber. The data acquisition device is used for emitting the laser signal into the optical fiber, receiving the reflection laser signal of each point of the inner wall of the optical fiber sensing device, converting the reflection laser signal into a second seismic signal, and processing the converted second seismic signal to determine the intensity and the spatial geometrical position of an underground source. According to the invention, the micro-seismic monitoring system is used to carry out micro-seismic monitoring, which can improve the reliability and the accuracy of a micro-seismic monitoring result.
Description
Technical field
The application relates to technical field of geophysical exploration, particularly a kind of micro-earthquake monitoring system and method.
Background technology
Microseismic is the new technology for the oil-gas field development stage occurred in recent years, and it is by observation, analyzes in activity in production the geophysical techniques that the small seismic events produced monitors the impact of activity in production, effect and underground state.The method mainly comprises the following steps: in well or ground configuration geophone arrangement; Receive the small seismic events that activity in production produced or induced; And by asking for the parameters such as microearthquake source location to the inverting of these events; Finally, these parameters are utilized to monitor activity in production or instruct.At present, the method is mainly used in crack dynamic imaging and the pressure later evaluation of oil field low permeability reservoir and shale reservoir hydrfracturing, and the dynamic monitoring in oilfield development process.
Micro-seismic monitoring is divided into ground micro-seismic to monitor and borehole microseismic monitors this two kinds of modes.At present, on the ground of ground micro-seismic monitoring mainly around target area (such as fractured well), arrange hundreds of or thousands of ground simple components or three-component seismometer, the seismic signal produced when utilizing the wave detector record subsurface rock arranged to break is to carry out micro-seismic monitoring.Borehole microseismic is monitored in a bite or several mouthfuls of wells of mainly closing on around target area and is arranged what is to tens grades of three-component seismometer receiving arraies, then utilizes the wave detector arranged to carry out micro-seismic monitoring.
Realizing in the application's process, inventor finds that in prior art, at least there are the following problems:
Use detector array to carry out micro-seismic monitoring in prior art, but the remolding sensitivity of wave detector is lower, sensing range limited (such as within 800 meters, down-hole), this have impact on the reliability of micro-seismic monitoring result.
Summary of the invention
The object of the embodiment of the present application is to provide a kind of micro-earthquake monitoring system and method, to improve the reliability of micro-seismic monitoring result.
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of micro-earthquake monitoring system and method to be achieved in that
The embodiment of the present application provides a kind of micro-earthquake monitoring system, comprising: interconnective fibre-optical sensing device and data collector;
Described fibre-optical sensing device comprises optical fiber, described fibre-optical sensing device is layed in ground and/or well, and it is for conducting received laser signal, receiving the first vibration signal of sending of subsurface source and send the reflected laser signals from described optical fiber to described data collector;
Described data collector is used for received reflected laser signals to be converted into the second seismic signal, and processes the second transformed seismic signal, and then determines intensity and the space geometry position of subsurface source.
In certain embodiments, described data collector comprises:
Receiving element, for receiving the described reflected laser signals at all monitoring points place;
Contrast unit, the reflected laser signals preset for the reflected laser signals at M monitoring point place that received by described receiving element and described M monitoring point place contrasts, judge whether the reflected laser signals at described M monitoring point place changes, wherein M is for being more than or equal to 3 positive integers;
Choose unit, for when the reflected laser signals that described contrast unit judges goes out described M monitoring point place changes, choose the reflected laser signals at the N number of monitoring point place changed, wherein, 3≤N≤M;
Conversion unit, for being converted into the second vibration signal by the described reflected laser signals chosen selected by unit;
Processing unit, for processing described second vibration signal, determines intensity and the space geometry position of described subsurface source.
In certain embodiments, described data collector comprises:
Receiving element, for receiving the described reflected laser signals at all monitoring points place;
Conversion unit, the described reflected laser signals for M the monitoring point place received by described receiving element is converted into the second vibration signal;
Contrast unit, contrasts for the default vibration signal of second vibration signal at M monitoring point place that transformed by described conversion unit and described M monitoring point place, judges whether second vibration signal at described M monitoring point place changes;
Choose unit, for when the second vibration signal that described contrast unit judges goes out described M monitoring point place changes, choose second vibration signal at the N number of monitoring point place changed;
Processing unit, for processing described the second vibration signal chosen selected by unit, determines intensity and the space geometry position of described subsurface source.
In certain embodiments, described processing unit comprises:
First determines subelement, for the energy according to described second vibration signal, determines the intensity of described subsurface source;
Computation subunit, for the reception time difference according to compressional wave and shear wave in described second vibration signal, calculates the most short lines distance of described subsurface source to described N number of monitoring point;
Second determines subelement, and the most short lines distance calculated for utilizing described computation subunit and the position coordinates of described N number of monitoring point, determine the space geometry position of described subsurface source.
In certain embodiments, described data collector also comprises transmitter unit, and described transmitter unit is used for described fibre-optical sensing device Emission Lasers signal.
In certain embodiments, described micro-earthquake monitoring system also comprises emitter, and described emitter is used for described fibre-optical sensing device Emission Lasers signal.
In certain embodiments, described fibre-optical sensing device comprises one or more distribution type fiber-optic vibration-sensing cable or armored fiber optic cable, containing distributed sound wave sensor fibre in described distribution type fiber-optic vibration-sensing cable.
The embodiment of the present application additionally provides another kind of micro-earthquake monitoring system, comprising: interconnective fibre-optical sensing device, data collector and data processing equipment;
Described fibre-optical sensing device comprises optical fiber, described fibre-optical sensing device is layed in ground and/or well, and it is for conducting received laser signal, receiving the first vibration signal of sending of subsurface source and send the reflected laser signals from described optical fiber to described data collector;
Described data collector is used for received reflected laser signals to send to data processing equipment;
Described data processing equipment is used for the reflected laser signals that described data collector sends to be converted into the second seismic signal, and processes the second transformed seismic signal, determines intensity and the space geometry position of subsurface source.
In certain embodiments, described data processing equipment comprises:
Receiving element, for receiving the described reflected laser signals that described data collector sends;
Contrast unit, the reflected laser signals preset for the reflected laser signals at M monitoring point place that received by described receiving element and described M monitoring point place contrasts, judge whether the reflected laser signals at described M monitoring point place changes, wherein M is for being more than or equal to 3 positive integers;
Choose unit, for when the reflected laser signals that described contrast unit judges goes out described M monitoring point place changes, choose the reflected laser signals at the N number of monitoring point place changed, wherein, 3≤N≤M;
Conversion unit, for being converted into the second vibration signal by the described reflected laser signals chosen selected by unit;
Processing unit, for processing described second vibration signal, determines intensity and the space geometry position of described subsurface source.
In certain embodiments, described data processing equipment comprises:
Receiving element, for receiving the described reflected laser signals that described data collector sends;
Conversion unit, the described reflected laser signals for M the monitoring point place received by described receiving element is converted into the second vibration signal;
Contrast unit, contrasts for the default vibration signal of second vibration signal at M monitoring point place that transformed by described conversion unit and described M monitoring point place, judges whether second vibration signal at described M monitoring point place changes;
Choose unit, for when the second vibration signal that described contrast unit judges goes out described M monitoring point place changes, choose second vibration signal at the N number of monitoring point place changed;
Processing unit, for processing described the second vibration signal chosen selected by unit, determines intensity and the space geometry position of described subsurface source.
In certain embodiments, described processing unit comprises:
First determines subelement, for the energy according to described second vibration signal, determines the intensity of described subsurface source;
Computation subunit, for the reception time difference according to compressional wave and shear wave in described second vibration signal, calculates the most short lines distance of described subsurface source to described N number of monitoring point;
Second determines subelement, and the most short lines distance calculated for utilizing described computation subunit and the position coordinates of described N number of monitoring point, determine the space geometry position of described subsurface source.
In certain embodiments, described data collector also comprises transmitter unit, and described transmitter unit is used for described fibre-optical sensing device Emission Lasers signal.
In certain embodiments, described micro-earthquake monitoring system also comprises emitter, and described emitter is used for described fibre-optical sensing device Emission Lasers signal.
In certain embodiments, described fibre-optical sensing device comprises one or more distribution type fiber-optic vibration-sensing cable or armored fiber optic cable, containing distributed sound wave sensor fibre in described distribution type fiber-optic vibration-sensing cable.
The embodiment of the present application additionally provides a kind of method utilizing above-mentioned micro-earthquake monitoring system to carry out micro-seismic monitoring, comprising:
Laser signal received by conduction;
Receive the first vibration signal that subsurface source sends;
The reflected laser signals from being arranged in ground and/or well is sent, to determine intensity and the space geometry position of subsurface source to described data collector.
The embodiment of the present application additionally provides another kind and utilizes above-mentioned micro-earthquake monitoring system to carry out the method for micro-seismic monitoring, comprising:
Receive the reflected laser signals of the described fibre-optical sensing device transmission being arranged in ground and/or well, described reflected laser signals comprises the first reflected laser signals reflected after described optical fiber receives described vibration signal;
Described reflected laser signals is converted into the second vibration signal;
Described second vibration signal is processed, determines intensity and the space geometry position of described subsurface source.
The technical scheme provided from above the embodiment of the present application, fibre-optical sensing device is provided with in the micro-earthquake monitoring system that the embodiment of the present application provides, namely this micro-earthquake monitoring system adopts fiber-optic probe, it can detect microseism signal or acoustic signals, and an optical fiber can have the monitoring point of thousands of vibration signals, this can improve sensitivity and the sensing range of micro-earthquake monitoring system, thus achieves the reliability improving micro-seismic monitoring result.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of micro-earthquake monitoring system in the embodiment of the present application.
Fig. 2 is the another kind of structural representation of micro-earthquake monitoring system in the embodiment of the present application.
Fig. 3 is a kind of method flow diagram utilizing micro-earthquake monitoring system to carry out micro-seismic monitoring in the embodiment of the present application.
Fig. 4 is the another kind of method flow diagram utilizing micro-earthquake monitoring system to carry out micro-seismic monitoring in the embodiment of the present application.
Fig. 5 is a kind of schematic diagram utilizing micro-earthquake monitoring system to carry out ground micro-seismic monitoring in the embodiment of the present application.
Fig. 6 is the another kind of schematic diagram utilizing micro-earthquake monitoring system to carry out ground micro-seismic monitoring in the embodiment of the present application.
Fig. 7 is the schematic diagram utilizing micro-earthquake monitoring system to carry out individual well micro-seismic monitoring in the embodiment of the present application.
Fig. 8 is the schematic diagram utilizing micro-earthquake monitoring system to carry out twin-well micro-seismic monitoring in the embodiment of the present application.
Fig. 9 is the schematic diagram utilizing micro-earthquake monitoring system simultaneously face and borehole microseismic monitoring in the embodiment of the present application.
Embodiment
The embodiment of the present application provides a kind of micro-earthquake monitoring system and method.
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
The structural representation of a kind of micro-earthquake monitoring system that Fig. 1 provides for the embodiment of the present application.This micro-earthquake monitoring system can comprise: interconnective fibre-optical sensing device 2 and data collector 3.Optical fiber is provided with in fibre-optical sensing device 2, this device can be layed in ground and/or be arranged in well, its may be used for conducting from the external world laser signal, receive the first vibration signal of sending of subsurface source and send the reflected laser signals from described optical fiber to data collector 3.Data collector 3 may be used for the reflected laser signals receiving fibre-optical sensing device 2 transmission, and described reflected laser signals is converted into the second vibration signal, and the second vibration signal after transforming is processed, determine intensity and the space geometry position of subsurface source.
Described second vibration signal can be identical with described first vibration signal, also can be different.Such as, also may the vibration signal that produces of other weak interference extraneous in described second vibration signal.
In one embodiment, data collector 3 can comprise receiving element, contrast unit, choose unit, conversion unit and processing unit (not shown).Wherein,
Described receiving element may be used for receiving the reflected laser signals at all monitoring points place on described optical fiber.Described reflected laser signals can be the first reflected laser signals or the second reflected laser signals.After described first reflected laser signals can refer to that described optical fiber receives the vibration signal that subsurface source sends, the reflected laser signals that its inwall each point is reflected back; When described second reflected laser signals can refer to that the vibration signal that underground does not have focus or subsurface source to produce does not propagate into described optical fiber, after described optical fiber receives laser signal, the reflected laser signals that its inwall each point is reflected back.Can to be technician set according to surveying tasks or the geological data that collects in described monitoring point, such as, for the optical fiber of 1000 meters long, can every 1 meter, 2 meters, 5 meters or 10 meters a monitoring point is set.Described monitoring point can be a point, also can represent in a segment distance institute a little.Described first reflected laser signals or the second reflected laser signals all can comprise amplitude and the phase place of scattered light.Described first reflected laser signals can be different from described second reflected laser signals, and the concrete amplitude that can refer to scattered light is different, also can refer to that the phase place of scattered light is different, can also refer to that the amplitude of scattered light and phase place are not identical.
The reflected laser signals that described contrast unit may be used for the reflected laser signals at M the monitoring point place received by described receiving element and described M monitoring point place presetting contrasts, and judges whether the reflected laser signals at described M monitoring point place changes.Wherein M is for being more than or equal to 3 positive integers, and it can represent the total quantity of monitoring point.Described default reflected laser signals can be that technician is arranged according to theory calculate or experimental data.
Described unit of choosing may be used for when the reflected laser signals that described contrast unit judges goes out described M monitoring point place changes, namely when the reflected laser signals having multiple monitoring point place in a described M monitoring point is different from the reflected laser signals that this monitoring point place presets, N number of reflected laser signals changed is chosen, wherein 3≤N≤M from the reflected laser signals of a described M monitoring point.
Described conversion unit may be used for the described reflected laser signals chosen selected by unit to be converted into the second vibration signal.
The second vibration signal that described processing unit may be used for described conversion unit transforms processes, and determines intensity and the space geometry position of described subsurface source.Described processing unit can comprise:
First determines subelement, and it may be used for, according to the energy of described second vibration signal, determining the intensity of described subsurface source.Described energy can be described second vibration signal amplitude or process obtained numerical value to described amplitude, such as, carries out square operation to described amplitude.
Computation subunit, it may be used for the reception time difference according to compressional wave and shear wave in described second vibration signal, calculates the most short lines distance of described subsurface source to described N number of monitoring point;
Second determines subelement, and the most short lines distance that it may be used for utilizing described computation subunit to calculate and the position coordinates of this N number of monitoring point, determine the space geometry position of described subsurface source.
In another embodiment, data collector 3 can comprise receiving element, conversion unit, contrast unit, choose unit and processing unit (not shown).Wherein,
Described receiving element may be used for the described reflected laser signals receiving all monitoring points place;
The described reflected laser signals that described conversion unit may be used for M the monitoring point place received by described receiving element is converted into the second vibration signal;
The vibration signal that described contrast unit may be used for second vibration signal at M the monitoring point place transformed by described conversion unit and described M monitoring point place presetting contrasts, and judges whether second vibration signal at described M monitoring point place changes.Described default vibration signal can be that technician is arranged according to theory calculate or experiment;
Described unit of choosing may be used for, when the second vibration signal that described contrast unit judges goes out described M monitoring point place changes, choosing second vibration signal at the N number of monitoring point place changed;
Described processing unit may be used for processing described the second vibration signal chosen selected by unit, determines intensity and the space geometry position of described subsurface source.
It should be noted that, the specific descriptions of this embodiment with reference to a upper embodiment, no longer can be gone to live in the household of one's in-laws on getting married at this and chat.
In one embodiment, data collector 3 can also comprise transmitter unit, and described transmitter unit may be used for fibre-optical sensing device 2 Emission Lasers signal.
In another embodiment, this micro-earthquake monitoring system can also comprise emitter (not shown), and described emitter may be used for described fibre-optical sensing device Emission Lasers signal.
Fibre-optical sensing device 2 can be distribution type fiber-optic vibration-sensing cable, also can be armored fiber optic cable.Distribution type fiber-optic vibration-sensing cable and armored fiber optic cable have the function of transmission and sensing simultaneously, each monitoring point on the optical fiber link that sensor fibre is formed is all sensitive spot, each monitoring point can be equivalent to a shock sensor, thus the distance sensing of distribution type fiber-optic vibration-sensing cable can be long arbitrarily in theory, spatial resolution also can be arbitrarily small, and this also can increase the sensing range of distribution type fiber-optic vibration-sensing cable.Described monitoring point can be any point on optical fiber link, the qualified point that also can be technician selected on optical fiber link according to surveying tasks.
Fibre-optical sensing device 2 can be layed in ground or shallow embedding below earth's surface, also can be layed in a bite well or many mouthfuls of wells.
Optical fiber in fibre-optical sensing device 2 can be distributed acoustic ripple sensor fibre.It, except advantages such as passive, the electromagnetism interference characteristics that possesses that traditional Fibre Optical Sensor possesses, also has the following advantages:
(1) distributed perception and high-density acquisition: distributed sound wave sensor fibre self is exactly sensor, can realize high density earthquake signals collecting by very low cost;
(2) Large Copacity transmission: distributed sound wave sensor fibre self can realize large-capacity data transmission, does not need to process optical fiber as the sensor of other microstructures, can as the communications optical cable of transmission of seismic data;
(3) detecting distance is long: in an experiment, and the detecting distance of distributed sound wave sensor fibre can reach 175 kilometers; In actual applications, its detecting distance can reach 80 kilometers;
(4) high sensitivity: the phase detection techniques due to light take optical wavelength as measurement unit, therefore may be used for detecting very microseism or acoustic signals;
(5) multipoint positioning accurately: in distributed sound wave sensor fibre, each sensing unit independently, with the synchronous sampling period receives outer signals, and can not interfere with each other.
(6) low cost: because distributed sound wave sensor fibre has the characteristics such as full distributed and long distance, sensing unit is the optical cable of uniformity, the cost of its unit monitoring length can well below the electronic sensor of other types (such as, seismoreceiver) and point type Fibre Optical Sensor.
Can be found out by foregoing description, fibre-optical sensing device is provided with in the micro-earthquake monitoring system that the embodiment of the present application provides, namely this micro-earthquake monitoring system adopts fiber-optic probe, it can detect microseism signal or acoustic signals, this can improve sensitivity and the sensing range of micro-earthquake monitoring system, thus achieves the reliability improving micro-seismic monitoring result.In addition, optical fiber in fibre-optical sensing device can be distributed sound wave sensor fibre, it has cheap, lightweight, distance sensing length, sensitivity advantages of higher, and an optical fiber can have the monitoring point of thousands of vibration signals, thus can record mass data, this can reduce the production cost of micro-earthquake monitoring system, the quantity increasing the subsurface seismic event of monitoring, the quality improving micro-seismic monitoring result, signal to noise ratio (S/N ratio) and reliability etc. further.
The embodiment of the present application additionally provides another kind of micro-earthquake monitoring system, as shown in Figure 2.This micro-earthquake monitoring system can comprise: interconnective fibre-optical sensing device 21, data collector 22 and data processing equipment 23.Be provided with optical fiber in fibre-optical sensing device 21, this device may be used for conducting from the external world laser signal, receive the first vibration signal of sending of subsurface source and send the reflected laser signals from described optical fiber to data collector 3.Data collector 22 may be used for the reflected laser signals receiving fibre-optical sensing device 2 transmission, and received reflected laser signals is sent to data processing equipment 23.Described reflected laser signals can be converted into the second vibration signal by data processing equipment 23, and processes the second vibration signal after transforming, and determines intensity and the space geometry position of subsurface source.
It should be noted that, can the specific descriptions of the micro-earthquake monitoring system shown in reference diagram 1 to the specific descriptions of this embodiment.
Can be found out by foregoing description, fibre-optical sensing device is provided with in the micro-earthquake monitoring system that the embodiment of the present application provides, namely this micro-earthquake monitoring system adopts fiber-optic probe, it can detect microseism signal or acoustic signals, this can improve sensitivity and the sensing range of micro-earthquake monitoring system, thus achieves the reliability improving micro-seismic monitoring result.In addition, optical fiber in fibre-optical sensing device can be distributed sound wave sensor fibre, it has cheap, lightweight, distance sensing length, sensitivity advantages of higher, on it, every bit all can as monitoring point, thus can record mass data, this can reduce the production cost of micro-earthquake monitoring system, the quantity increasing the subsurface seismic event of monitoring, the quality improving micro-seismic monitoring result, signal to noise ratio (S/N ratio) and reliability etc. further.
The embodiment of the present application additionally provides a kind of method utilizing above-mentioned micro-earthquake monitoring system to carry out micro-seismic monitoring, as shown in Figure 3.Described micro-seismic monitoring can comprise ground micro-seismic monitoring and/or borehole microseismic monitoring.The method can comprise the following steps:
S110: the laser signal received by fibre-optical sensing device conduction.
Described fibre-optical sensing device can be one or more distribution type fiber-optic vibration-sensing cables, also can be armored fiber optic cable.Distributed sound wave sensor fibre can be provided with in described fibre-optical sensing device.
After the laser signal receiving data collector or the transmitting of other devices, described fibre-optical sensing device can conduct received laser signal therein, can propagate on each point of optical fiber inwall to make described laser signal.
Described laser signal can be that data collector or other devices send based on trigger condition.Described trigger condition can be robotization instruction or the manual command of instruction Emission Lasers signal, also can be the time of default Emission Lasers signal.
S120: fibre-optical sensing device receives the first vibration signal that subsurface source sends.
After subsurface source sends the first vibration signal, described first vibration signal can propagate arrival fibre-optical sensing device within a certain period of time, and namely fibre-optical sensing device receives the first vibration signal that subsurface source sends.
Described first vibration signal can be seismic signal, and can be also microearthquake signal, can also be other forms of vibration signal.Described microearthquake signal can be the signal that subsurface rock breaks or deformation produces.
S130: fibre-optical sensing device sends the reflected laser signals from described optical fiber to data collector, to determine intensity and the space geometry position of subsurface source.
After described fibre-optical sensing device receives the first vibration signal that subsurface source sends, on described optical fiber inwall, each point may produce corresponding strain, certain a bit on strain may cause the reflected laser signals generation amplitude of this point and/or the change of phase place.When after the reflected laser signals changed on described optical fiber, the reflected laser signals be reflected back from described optical fiber inwall is sent to described data collector by described fibre-optical sensing device.Described data collector can process received reflected laser signals, determines intensity and the space geometry position of described subsurface source.
In one embodiment, described data collector processes received reflected laser signals, determine that the space geometry position of described subsurface source can comprise described data collector and received reflected laser signals and the reflected laser signals preset be contrasted, judge whether the reflected laser signals received changes; When judging that received reflected laser signals changes, choose the reflected laser signals corresponding to N number of monitoring point changed; Selected reflected laser signals is processed, determines intensity and the space geometry position of described subsurface source.
Described received reflected laser signals and the reflected laser signals preset are carried out contrast can refer to the amplitude of the amplitude of received reflected laser signals, phase place and/or energy and default reflected laser signals, phase place and/or energy are contrasted.
Whether the reflected laser signals that described judgement receives changes whether identical with the energy of described default reflected laser signals or the energy differences both judging of the energy that can refer to the reflected laser signals that judgement receives whether in preset range.Whether whether the change amplitude that can refer to and judge described reflected laser signals and/or phase place of the reflected laser signals that described judgement receives changes.
In another embodiment, described data collector processes received reflected laser signals, determine that the space geometry position of described subsurface source can comprise described data collector and be contrasted separately by the reflected laser signals at received each monitoring point place, judge whether that the reflected laser signals that there is monitoring point place is undergone mutation (described in undergo mutation the amplitude at the amplitude that can refer to this monitoring point place signal or energy monitoring point adjacent with front and back place or capacity volume variance very large); When the reflected laser signals judging to have monitoring point place changes, choose the reflected laser signals corresponding to N number of monitoring point changed; Selected reflected laser signals is processed, determines intensity and the space geometry position of described subsurface source.
In another embodiment, described data collector processes received reflected laser signals, determines that the space geometry position of described subsurface source can comprise and the described reflected laser signals at received M monitoring point place is converted into the second vibration signal; The vibration signal that second vibration signal at transformed M monitoring point place and described M monitoring point place are preset is contrasted, judges whether second vibration signal at described M monitoring point place changes; When judging that second vibration signal at described M monitoring point place changes, choose second vibration signal at the N number of monitoring point place changed; Described the second vibration signal chosen selected by unit is processed, determines intensity and the space geometry position of described subsurface source.
In one embodiment, described data collector processes the second transformed vibration signal, determine that the intensity of described subsurface source and space geometry position can comprise described data collector and according to the energy of described second vibration signal, can determine the intensity of described subsurface source; According to the reception time difference of compressional wave and shear wave in described second vibration signal, calculate the most short lines distance of subsurface source to described N number of monitoring point; Utilize the position coordinates of most short lines distance and the described N number of monitoring point calculated, determine the locus of described subsurface source.
In another embodiment, described data collector processes selected reflected laser signals, determines that the intensity of described subsurface source and space geometry position can comprise described data collector and selected reflected laser signals be sent to data processing equipment in described micro-earthquake monitoring system; Received reflected laser signals is converted into the second vibration signal by described data processing equipment; Described data processing equipment, according to the energy of described second vibration signal, determines the intensity of described subsurface source; And according to reception time difference of compressional wave and shear wave in described second vibration signal, calculate the most short lines distance of subsurface source to described N number of monitoring point; Described data processing equipment utilizes the position coordinates of most short lines distance and the described N number of monitoring point calculated, and determines the locus of described subsurface source.
Following formula can be utilized to calculate the most short lines distance R of subsurface source to i-th monitoring point
i:
Δt
i＝t
Si-t
Pi(2)
Wherein, Ri is the most short lines distance between a certain focal point and i-th monitoring point; V
pand V
sbe respectively velocity of longitudinal wave and shear wave velocity, it can obtain from log data; t
sifor shear wave arrives the time of i-th monitoring point; t
pifor compressional wave arrives the time of i-th monitoring point; I is positive integer.
In the above-described embodiments, existing computing method all can be adopted to calculate the space geometry position of subsurface source, no longer go to live in the household of one's in-laws on getting married at this and chat.It should be noted that, the described execution sequence not restriction determined between the intensity of described subsurface source and the described space geometry position determining subsurface source.
When the signal that described first vibration signal produces for rock burst, data collector 3 can by processing the vibration signal after conversion, determine the rupture location of rock, the information such as the physical dimension in collapse strength, rupture mechanism, crack and azimuth tendency.Concrete, data collector 3 can determine the rupture location of rock by the mistiming between detected compressional wave and shear wave arrival observation station; Can also according to described in the energy size of microearthquake signal that detects determine the collapse strength of rock, the energy of the microearthquake signal received is larger, then the collapse strength of rock is larger; Also can judge the failure mechanism of rock according to the polarity of the microearthquake signal that focal point both sides observation station detects, the failure mechanism of subsurface rock breakdown point can be divided into tension fracture, the property sheared is broken, tensile and shearing mixing break etc.; Also can also come to descend definitely according to the distribution range of the micro-seismic event produced in frac job process and the micro-seismic event increased with the activity duration quantity geometric scale and the azimuth tendency information in the crack after rock burst.
Can be found out by foregoing description, the first vibration signal that the embodiment of the present application sends by utilizing fibre-optical sensing device to receive subsurface source, and according to the first received vibration signal, the reflected laser signals of described laser signal is sent to data collector, to determine the locus of described subsurface source, this can improve the reliability of micro-seismic monitoring result.
The embodiment of the present application additionally provides a kind of method utilizing above-mentioned micro-earthquake monitoring system to carry out micro-seismic monitoring, as shown in Figure 4.Described micro-seismic monitoring can comprise ground micro-seismic monitoring and/or borehole microseismic monitoring.The method can comprise the following steps:
S210: receive the reflected laser signals from fibre-optical sensing device.
Data collector can receive the reflected laser signals of fibre-optical sensing device.Described reflected laser signals can be the first reflected laser signals or the second reflected laser signals.
S220: described reflected laser signals is converted into the second vibration signal.
After receiving reflected laser signals, received reflected laser signals directly can be converted into the second vibration signal by data collector; Also received reflected laser signals can be sent to data processing equipment, data processing equipment is converted into the second vibration signal by after received reflected laser signals.
S230: process described second vibration signal, determines intensity and the space geometry position of described subsurface source.
If received reflected laser signals is converted into the second vibration signal by data collector in previous step, then data collector processes described second vibration signal in this step, determines intensity and the space geometry position of described subsurface source.If received reflected laser signals is converted into the second vibration signal by data processing equipment in previous step, then data processing equipment processes described second vibration signal in this step, determines intensity and the space geometry position of described subsurface source.
The concrete implementation of step S210-S230 with reference to the embodiment shown in figure 3 and the micro-earthquake monitoring system shown in Fig. 1-2, no longer can be gone to live in the household of one's in-laws on getting married at this and chats.
Further illustrate the micro-earthquake monitoring system how utilizing the embodiment of the present application to provide below to monitor to the ground micro-seismic monitoring and/or borehole microseismic of carrying out waterfrac treatment with embody rule example.
Fig. 5-Fig. 6 shows the schematic diagram utilizing the micro-earthquake monitoring system in the application to carry out ground micro-seismic monitoring.In this embodiment, fibre-optical sensing device is optical fiber vibration sensing cable 2, it can be layed in ground or shallow embedding below earth's surface, the top of the lateral segment of frac job will be carried out in the concrete underground that can be laid on, and the length of optical fiber vibration sensing cable 2 and distribution range can be greater than the length of described lateral segment.The sensor fibre of optical fiber vibration sensing cable 2 inside has multiple monitoring point 4, and described multiple monitoring point 4 can comprise at least three exemplary observation stations, such as monitoring point P1-P3.Described observation station can be the position place of seismic wave propagation to optical fiber vibration sensing cable 2.Optical fiber vibration sensing cable 2 may be used for detecting the microearthquake signal produced when subsurface rock breaks or is out of shape.Data collector is instrument truck 3, can be placed with acquisition instrument and data handling machine in it, may be used for recording optical fiber vibration sensing cable 2 receives in well microearthquake signal and to go forward side by side row relax.
In one embodiment, the detailed process utilizing this micro-earthquake monitoring system to carry out ground micro-seismic monitoring can be expressed as follows:
Under trigger condition, instrument truck 3 is to optical fiber vibration sensing cable 2 Emission Lasers signal, reflect during the sensor fibre of laser signal by optical fiber vibration sensing cable 2 inside, the reflected laser signals be reflected back sends to instrument truck 3 to process by optical fiber vibration sensing cable 2.
The microearthquake signal produced when underground rock burst from rock burst point 1 (i.e. focal point S) along stratum with velocity of longitudinal wave V
pwith shear wave velocity V
swhen propagating to the three dimensions around focal point S, if the velocity of longitudinal wave V on stratum
pwith shear wave velocity V
sremain unchanged, the form with spherical wave is outwards propagated by the microearthquake signal that rock burst point 1 produces always, and the through compressional wave in seismic event and shear wave can arrive ground successively by the air line distance on its focal point S distance ground.When seismic wave propagation is to optical fiber vibration sensing cable 2, each monitoring point 4 on optical fiber vibration sensing cable 2 is subject to the impact of seismic event successively and produces and vibrate and cause optical fiber to strain, thus the feature resulting through the laser signal of sensor fibre changes, and then the reflected laser signals causing optical fiber vibration sensing cable 2 to be reflected back changes.The reflected laser signals changed is sent to instrument truck 3 by optical fiber vibration sensing cable 2.Process instrumentation in instrument truck 3 processes the reflected laser signals that optical fiber vibration sensing cable 2 sends, and determines the information such as physical dimension and azimuth tendency in the particular location of rock burst point 1, collapse strength, rupture mechanism, crack according to result.
Below with monitoring point P
1-P
3be example as observation station, the particular location how determining rock burst point 1 be described, as seen in figs. 5-6.In Figure 5, monitoring point P
1on the left side of focal point S, monitoring point P
2directly over focal point S, monitoring point P
3on the right of focal point S, monitoring point P
2and P
3with monitoring point P
1symmetrical.In figure 6, monitoring point P
1on the left side of focal point S, monitoring point P
2directly over focal point S, monitoring point P
3on the right of focal point S, monitoring point P
2and P
3not with monitoring point P
1symmetrical.It should be noted that, monitoring point P
1-P
3be not limited to the position be positioned at shown in Fig. 5 and Fig. 6.
In both of the figures, focal point S and monitoring point P
1, P
2and P
3between most short lines distance be respectively R5, R6 and R7, wherein R6 is the overhead nearest distance of focus, and the seismic event that the peripherad three dimensions of focal point S is propagated can arrive monitoring point P at first
2.According to geometry, on the sphere 8 that can judge focal point S to be positioned at R5 be radius, monitoring point P1 is the centre of sphere, also on the sphere 9 that to be positioned at R6 be radius, monitoring point P2 is the centre of sphere and with R7 be radius, on the monitoring point P3 sphere 10 that is the centre of sphere, its unique point of intersection specifically between three spheres 8,9,10.Above-mentioned formula (1) and (2) can be utilized to calculate R5, R6 and R7.
According to calculating R5, R6 and R7 and monitoring point P of obtaining
1, P
2and P
3position coordinates, the position coordinates of focal point S can be calculated, namely can obtain the space geometry position of rock burst point 1.Existing computing method can be adopted to calculate the geometric position coordinate of focal point S, no longer go to live in the household of one's in-laws on getting married at this and chat.
It should be noted that, above-mentioned the position how determining rock burst point 1 is only described for three observation stations, but the quantity of observation station is not limited to three.Observation station is more, higher to the positioning precision of the space geometry position of underground rock burst point 1 or focal point S.Above-mentioned only for underground focal point, the space geometry position for other focal points also can calculate in the same way, no longer goes to live in the household of one's in-laws on getting married chat at this.
The micro-earthquake monitoring system provided by utilizing the embodiment of the present application carries out ground micro-seismic monitoring, can improve accuracy and the reliability of the horizontal coordinate positioningly descending micro-seismic event.
Fig. 7-Fig. 8 shows the schematic diagram utilizing the micro-earthquake monitoring system in the application to carry out borehole microseismic monitoring.Wherein, Fig. 7 lays the schematic diagram that armored fiber optic vibration-sensing cable carries out borehole microseismic monitoring in individual well.Fig. 8 lays the schematic diagram that armored fiber optic vibration-sensing cable carries out borehole microseismic monitoring more than two mouthfuls or two mouthfuls in well.
As shown in Figure 7, this micro-earthquake monitoring system can comprise one and is layed in optical fiber vibration sensing cable 2 in well and instrument truck 3.Optical fiber vibration sensing cable 2 may be used for sensing the microearthquake signal produced when subsurface rock breaks or is out of shape.Instrument truck 3 is connected with optical fiber vibration sensing cable 2, can be placed with acquisition instrument and process computer in it, may be used for recording optical fiber vibration sensing cable 2 receives in well microearthquake signal and to go forward side by side row relax.
Optical fiber vibration sensing cable 2 can be armored fiber optic cable, it is made up of the armouring wire of that is placed in one or the smaller stainless-steel tube of several diameter or several fibers and one or more layers high-strength corrosion-resisting be wrapped in outside described stainless-steel tube, damages in down-hole to prevent optical fiber by external force.In order to ensure good coupling, gluey sound wave couplant of annotating in stainless-steel tube, to ensure very close to each other between sensor fibre and stainless steel tube wall/space, the vibration signal of underground can be detected by sensor fibre smoothly.Armored fiber optic cable can be laid by following three kinds of laying modes in down-hole: (1) is suspended in sleeve pipe or uncased wellbore; (2) fix or be bundled in outside oil pipe, shifting down-hole onto with oil pipe; (3) with cement permanently sealing in outside of sleeve.
The detailed process utilizing this distributed downhole optic fiber micro-earthquake monitoring system to carry out borehole microseismic monitoring, with to utilize down-hole three-component seismometer array to carry out the detailed process of borehole microseismic monitoring the same, no longer superfluously to be chatted at this.
As shown in Figure 8, this micro-earthquake monitoring system can comprise two and is layed in optical fiber vibration sensing cable 2 in Liang Koujing (the first monitor well and the second monitor well) and instrument truck 3.These two optical fiber vibration sensing cables 2 may be used for sensing the microearthquake signal produced when subsurface rock breaks or is out of shape.Instrument truck 3 and this two optical fiber vibration sensing cables 2 are all connected, and may be used for recording optical fiber vibration sensing cable 2 receives in well microearthquake signal and to go forward side by side row relax, can be placed with acquisition instrument and process computer in it.
Optical fiber vibration sensing cable 2 can be armored fiber optic cable, it is made up of the armouring wire of that is placed in one or the smaller stainless-steel tube of several diameter or several fibers and one or more layers high-strength corrosion-resisting be wrapped in outside described stainless-steel tube, damages in down-hole to prevent optical fiber by external force.In order to ensure good coupling, gluey sound wave couplant of annotating in stainless-steel tube, to ensure very close to each other between sensor fibre and stainless steel tube wall/space, the vibration signal of underground can be detected by sensor fibre smoothly.Armored fiber optic cable can be laid by following three kinds of laying modes in down-hole: (1) is suspended in sleeve pipe or uncased wellbore; (2) fix or be bundled in outside oil pipe, shifting down-hole onto with oil pipe; (3) with cement permanently sealing in outside of sleeve.
In one embodiment, the detailed process utilizing this micro-earthquake monitoring system to carry out ground micro-seismic monitoring can be expressed as follows:
Under trigger condition, laser emitting module in instrument truck 3 is to optical fiber vibration sensing cable 2 Emission Lasers signal, reflect during the sensor fibre of laser signal by optical fiber vibration sensing cable 2 inside, the reflected laser signals be reflected back is sent to the data acquisition module in instrument truck 3 by optical fiber vibration sensing cable 2.
The microearthquake signal produced when underground rock burst from rock burst point 1 (i.e. focal point S) along stratum with velocity of longitudinal wave V
pwith shear wave velocity V
swhen propagating to the three dimensions around focal point S, if the velocity of longitudinal wave V on stratum
pwith shear wave velocity V
sremain unchanged, the form with spherical wave is outwards propagated by the microearthquake signal that rock burst point 1 produces always, and the through compressional wave in seismic event and shear wave can arrive ground successively by the air line distance on its focal point S distance ground.When seismic wave propagation is to optical fiber vibration sensing cable 2, each monitoring point 4 on optical fiber vibration sensing cable 2 is subject to the impact of seismic event successively and produces and vibrate and cause optical fiber to strain, thus the feature resulting through the laser signal of sensor fibre changes, and then the reflected laser signals causing optical fiber vibration sensing cable 2 to be reflected back changes.The reflected laser signals changed is sent to instrument truck 3 by optical fiber vibration sensing cable 2, process instrumentation in instrument truck 3 processes the reflected laser signals that optical fiber vibration sensing cable 2 sends, and determines the information such as physical dimension and azimuth tendency in the particular location of rock burst point 1, collapse strength, rupture mechanism, crack according to result.
Below with monitoring point P
1, P
2, P
3be example as observation station, the particular location how determining rock burst point 1 is described.In fig. 8, monitoring point P
1above focal point S, monitoring point P
2with focal point S in same level, monitoring point P
3in the below of focal point S.It should be noted that, monitoring point P
1, P
2, P
3be not limited to the position be positioned at shown in Fig. 8.
In fig. 8, the monitoring point P in focal point S and the first monitor well
1, P
2and P
3between most short lines distance be respectively R5, R6 and R7, the monitoring point P in focal point S and the second monitor well
1, P
2and P
3between most short lines distance be divided into R11, R12 and R13.Wherein R6 and R12 is respectively focus from the nearest distance of the first monitor well, the second monitor well.The seismic event that the peripherad three dimensions of focal point S is propagated can arrive the monitoring point P in this two monitor well at first
2.According to geometry, can judge focal point S be positioned at respectively with R5, R6 and R7 as radius, monitoring point P
1, P
2and P
3for unique point of intersection of the sphere 8,9,10 of the centre of sphere; Also be positioned at R11, R12 and R13 for radius, monitoring point P
1, P
2and P
3for unique point of intersection of the sphere 14,15,16 of the centre of sphere, and the intersection point coincidence that these two unique.Above-mentioned formula (1)-(2) can be utilized to calculate R5, R6, R7 and R11, R12, R13.
According to calculate obtain R5, R6, R7 and R11, monitoring point P in R12, R13 and two monitor wells
1, P
2, P
3position coordinates, the position coordinates of focal point S can be calculated, namely can obtain the space geometry position of rock burst point 1.Existing computing method can be adopted to calculate the position coordinates of focal point S, no longer go to live in the household of one's in-laws on getting married at this and chat.
It should be noted that, above-mentioned the position how determining rock burst point 1 is only described for three observation stations, but the quantity of observation station is not limited to three.Observation station is more, higher to the positioning precision of the space geometry position of underground rock burst point 1 or focal point S.Above-mentioned only for underground focal point, the space geometry position for other focal points also can calculate in the same way, no longer goes to live in the household of one's in-laws on getting married chat at this.
The micro-earthquake monitoring system provided by utilizing the embodiment of the present application carries out borehole microseismic monitoring, can improve accuracy and the reliability of the depth coordinate positioningly descending micro-seismic event.
Fig. 9 shows the schematic diagram of micro-earthquake monitoring system simultaneously face micro-seismic monitoring and the borehole microseismic monitoring utilized in the application.
Below with the monitoring point P in downhole optic fiber vibration-sensing cable
1, P
2, P
3with the monitoring point P in the optical fiber vibration-sensing cable of ground
4, P
5, P
6be example as observation station, the particular location how determining rock burst point 1 is described.In fig .9, the monitoring point P in downhole optic fiber vibration-sensing cable
1above focal point S, monitoring point P
2with focal point S in same level, monitoring point P
3in the below of focal point S.Monitoring point P in the optical fiber vibration-sensing cable of ground
4, P
5, P
6all above focal point S.It should be noted that, monitoring point P
1, P
2, P
3be not limited to the position be positioned at shown in Fig. 9.
In fig .9, the monitoring point P in focal point S and monitor well
1, P
2and P
3between most short lines distance be respectively R5, R6 and R7, the monitoring point P in focal point S and ground optical cable
4, P
5, P
6between most short lines distance be divided into R11, R12 and R13.Wherein R6 and R12 is respectively focus from monitor well and the nearest distance of ground optical cable.The seismic event that the peripherad three dimensions of focal point S is propagated can arrive the monitoring point P in monitor well at first
2with the monitoring point P in the optical fiber vibration-sensing cable of ground
5.According to geometry, can judge focal point S be positioned at respectively with R5, R6 and R7 as radius, monitoring point P
1, P
2and P
3for unique point of intersection of the sphere 8,9,10 of the centre of sphere; Also be positioned at R11, R12 and R13 for radius, monitoring point P
4, P
5and P
6for unique point of intersection of the sphere 14,15,16 of the centre of sphere, and the intersection point coincidence that these two unique.Above-mentioned formula (1)-(2) can be utilized to calculate R5, R6, R7 and R11, R12, R13.
According to calculate obtain R5, R6, R7 and R11, monitoring point P in R12, R13 and monitor well
1, P
2, P
3with the monitoring point P in the optical cable of ground
4, P
5, P
6position coordinates, the position coordinates of focal point S can be calculated, namely can obtain the space geometry position of rock burst point 1.Existing computing method can be adopted to calculate the position coordinates of focal point S, no longer go to live in the household of one's in-laws on getting married at this and chat.
Can the associated description of example shown in reference diagram 5-8 to the specific descriptions of example shown in Fig. 9, no longer superfluously to chat at this.
The micro-earthquake monitoring system provided by utilizing the embodiment of the present application carries out in well and ground micro-seismic monitoring simultaneously, can improve accuracy and the reliability of location micro-seismic event position coordinates (horizontal coordinate and depth coordinate) in subsurface three-dimensional space.
System, device or module that above-described embodiment is illustrated, specifically can be realized by computer chip or entity, or be realized by the product with certain function.
For convenience of description, various module is divided into describe respectively with function when describing above device.Certainly, the function of each module can be realized in same or multiple software and/or hardware when implementing the application.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Although depict the application by embodiment, those of ordinary skill in the art know, the application has many distortion and change and do not depart from the spirit of the application, and the claim appended by wishing comprises these distortion and change and do not depart from the spirit of the application.
Claims (10)
1. a micro-earthquake monitoring system, is characterized in that, comprising: interconnective fibre-optical sensing device and data collector;
Described fibre-optical sensing device comprises optical fiber, described fibre-optical sensing device is layed in ground and/or well, and it is for conducting received laser signal, receiving the first vibration signal of sending of subsurface source and send the reflected laser signals from described optical fiber to described data collector;
Described data collector is used for received reflected laser signals to be converted into the second seismic signal, and processes the second transformed seismic signal, and then determines intensity and the space geometry position of subsurface source.
2. micro-earthquake monitoring system according to claim 1, is characterized in that, described data collector comprises:
Receiving element, for receiving the described reflected laser signals at all monitoring points place;
Contrast unit, the reflected laser signals preset for the reflected laser signals at M monitoring point place that received by described receiving element and described M monitoring point place contrasts, judge whether the reflected laser signals at described M monitoring point place changes, wherein M is for being more than or equal to 3 positive integers;
Choose unit, for when the reflected laser signals that described contrast unit judges goes out described M monitoring point place changes, choose the reflected laser signals at the N number of monitoring point place changed, wherein, 3≤N≤M;
Conversion unit, for being converted into the second vibration signal by the described reflected laser signals chosen selected by unit;
Processing unit, processes for the second vibration signal transformed described conversion unit, determines intensity and the space geometry position of described subsurface source.
3. micro-earthquake monitoring system according to claim 1, is characterized in that, described data collector comprises:
Receiving element, for receiving the described reflected laser signals at all monitoring points place;
Conversion unit, the described reflected laser signals for M the monitoring point place received by described receiving element is converted into the second vibration signal;
Contrast unit, contrasts for the default vibration signal of second vibration signal at M monitoring point place that transformed by described conversion unit and described M monitoring point place, judges whether second vibration signal at described M monitoring point place changes;
Choose unit, for when the second vibration signal that described contrast unit judges goes out described M monitoring point place changes, choose second vibration signal at the N number of monitoring point place changed;
Processing unit, for processing described the second vibration signal chosen selected by unit, determines intensity and the space geometry position of described subsurface source.
4. the micro-earthquake monitoring system according to Claims 2 or 3, is characterized in that, described processing unit comprises:
First determines subelement, for the energy according to described second vibration signal, determines the intensity of described subsurface source;
Computation subunit, for the reception time difference according to compressional wave and shear wave in described second vibration signal, calculates the most short lines distance of described subsurface source to described N number of monitoring point;
Second determines subelement, and the most short lines distance calculated for utilizing described computation subunit and the position coordinates of described N number of monitoring point, determine the space geometry position of described subsurface source.
5. micro-earthquake monitoring system according to claim 1, is characterized in that, described data collector also comprises transmitter unit, and described transmitter unit is used for described fibre-optical sensing device Emission Lasers signal.
6. micro-earthquake monitoring system according to claim 1, is characterized in that, described micro-earthquake monitoring system also comprises emitter, and described emitter is used for described fibre-optical sensing device Emission Lasers signal.
7. according to claim 1-3, micro-earthquake monitoring system described in 5 or 6, it is characterized in that, described fibre-optical sensing device comprises one or more distribution type fiber-optic vibration-sensing cable or armored fiber optic cable, containing distributed sound wave sensor fibre in described distribution type fiber-optic vibration-sensing cable.
8. a micro-earthquake monitoring system, is characterized in that, comprising: interconnective fibre-optical sensing device, data collector and data processing equipment;
Described fibre-optical sensing device comprises optical fiber, described fibre-optical sensing device is layed in ground and/or well, and it is for conducting received laser signal, receiving the first vibration signal of sending of subsurface source and send the reflected laser signals from described optical fiber to described data collector;
Described data collector is used for received reflected laser signals to send to data processing equipment;
Described data processing equipment is used for the reflected laser signals that described data collector sends to be converted into the second seismic signal, and processes the second transformed seismic signal, determines intensity and the space geometry position of subsurface source.
9. utilize the micro-earthquake monitoring system described in claim 1 or 8 to carry out a method for micro-seismic monitoring, it is characterized in that, comprising:
Laser signal received by conduction;
Receive the first vibration signal that subsurface source sends;
The reflected laser signals from being arranged in ground and/or well is sent, to determine intensity and the space geometry position of subsurface source to described data collector.
10. utilize the micro-earthquake monitoring system described in claim 1 or 8 to carry out a method for micro-seismic monitoring, it is characterized in that, comprising:
The reflected laser signals that the described fibre-optical sensing device that reception is arranged in ground and/or well sends, described reflected laser signals comprises the first reflected laser signals reflected after described optical fiber receives described first vibration signal;
Described reflected laser signals is converted into the second vibration signal;
Described second vibration signal is processed, determines intensity and the space geometry position of described subsurface source.
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