CN104049278A - Multi-earthquake-source multi-towline trigger timing control system and method - Google Patents
Multi-earthquake-source multi-towline trigger timing control system and method Download PDFInfo
- Publication number
- CN104049278A CN104049278A CN201410286261.4A CN201410286261A CN104049278A CN 104049278 A CN104049278 A CN 104049278A CN 201410286261 A CN201410286261 A CN 201410286261A CN 104049278 A CN104049278 A CN 104049278A
- Authority
- CN
- China
- Prior art keywords
- focus
- frequency
- trigger
- earthquake
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides a multi-earthquake-source multi-towline trigger timing control system and method. The system comprises tow lines, earthquake sources and a control module. The control module comprises a central process, a double-channel earthquake collecting module, a high-precision clock module and a time service module. The earthquake sources are sequentially controlled to activate, the tow lines receive stratum data, seismic survey tasks can be finished efficiently at high quality, and multiple set of seismic section data in different detection depths and with different resolution ratios are obtained simultaneously in one seismic exploration.
Description
Technical field
The invention belongs to oceanographic engineering seismic exploration technique field, specifically, relate to the many towing cables of a kind of many focus and trigger sequential control system and method.
Background technology
In oceanographic engineering seismic exploration, conventionally use marine special-purpose focus and hydrophone streamer, utilization triggers focus and receives the seismic section that obtains stratum, seabed after stratum reflected signal is processed.Offshore shooting source type is a lot, and the characteristic of various focus is different, uses dissimilar focus in seismic prospecting, the penetration depth of the seismic section that obtains and the difference of resolution.Offshore shooting receives towing cable also all polymorphic types, towing cable select penetration depth and the resolution that also affects seismic section.Conventional oceanographic engineering seismic prospecting can only be used certain focus and certain towing cable to survey in a detection process, can only obtain the seismic section of a set of penetration depth and corresponding resolution, and exploration resource is not fully utilized, and exploration targets efficiency is lower.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, provide the many towing cables of a kind of many focus to trigger sequential control system and method, solve the contradiction between investigation depth and resolution characteristic, improve exploration efficiency.
For achieving the above object, the present invention takes following technical scheme:
In offshore shooting, use a surveying vessel, carry the many towing cables of many focus and trigger sequential control system, comprise towing cable, focus, control module, described control module comprises central processing unit, binary channels earthquake-capturing module, high precision clock module, time service module.
Further, the many towing cables of described many focus trigger sequential control system, comprise two above towing cables and the above focus of two covers, and number of streamers more than or equal focus quantity.
Preferably, a set of above binary channels earthquake-capturing module corresponding with towing cable and focus quantity of described control module configuration, a set of binary channels earthquake-capturing module is carried two towing cables and two cover focus.
Preferably, every described towing cable inside at least disposes 6 nautical receiving set combinations.
Preferably, every described towing cable internal configurations has 6～120 nautical receiving set combinations.
Preferably, focus can be selected one or more in air gun source, hydraulic giant focus, plasma focus, Boomer focus, wherein the about a kind of conventional focus of 500～3000Hz of Boomer focus frequency spectrum dominant frequency.
Adopt the many towing cables of many focus to trigger sequential control method, carry out seismic survey, carry out according to the following steps:
A, selection focus:
Epicenter excitation energy is directly proportional to investigation depth, but is inversely proportional to its wavelet spectrum size, in addition, although the focus that selective excitation energy is large can obtain the seismic section of layer deeper, but its resolution is low, according to the requirement of investigation depth and resolution, select suitable focus or its combination;
By excitation energy order from big to small, conventional focus includes but not limited to air gun source, hydraulic giant focus, plasma focus, Boomer focus etc.; Air gun source wavelet dominant frequency is in 10～250Hz left and right; The frequency spectrum dominant frequency of hydraulic giant is 250～1500Hz approximately; The frequency spectrum dominant frequency of plasma focus is 300～1700Hz approximately; The frequency spectrum dominant frequency of Boomer focus is 500～3000Hz approximately;
It has been generally acknowledged that, the focus of frequency spectrum dominant frequency 10～600Hz is low frequency focus, and investigation depth is about 0.8～10km, and resolution is about 8～120m;
The focus of frequency spectrum dominant frequency 600～1500Hz is intermediate frequency focus, and investigation depth is about 100～800m, and resolution is about 1～8m;
Focus more than frequency spectrum dominant frequency 1500Hz is high frequency focus, and investigation depth is below 100m, and resolution reaches even sub-meter grade of meter level;
B, selection towing cable
According to the requirement of investigation depth and resolution, select the inner towing cable that adopts different nautical receiving set configurations, the nautical receiving set configuration of towing cable adapts with source type and its frequency spectrum dominant frequency size of its collection signal;
Determine the corresponding relation of towing cable and focus, the signal of same epicenter excitation is by corresponding one or more towing cable collection;
Normally, high-frequency seism towing cable, the combination of 6～12 nautical receiving sets of choice for use internal configurations, the about towing cable of 15～25m of total length, the about 500Hz～12kHz of nautical receiving set dominant frequency;
Intermediate frequency earthquake towed cable, the combination of 20～25 nautical receiving sets of choice for use internal configurations, the about towing cable of 40～60m of total length, the about 20Hz～10kHz of nautical receiving set dominant frequency;
Low frequency earthquake towed cable, 80～120 nautical receiving sets of choice for use internal configurations combine, total length surpasses the towing cable of 200m, the about 10Hz～1kHz of nautical receiving set dominant frequency;
C, determine focus trigger interval:
In conditions permit situation, reduce focus trigger interval, to improve stratum lateral resolution;
Comparatively speaking, for low frequency focus, excitation energy is large, and the seismic event stratum penetration capacity exciting is strong, and accumulation of energy required time is long, sets trigger interval large; High frequency epicenter excitation energy is less, and a little less than the seismic event stratum penetration capacity exciting, the seismic event round-trip time is short, and accumulation of energy required time is short, sets trigger interval little; Generally,
The interval that preferably excites of low frequency focus is 3000ms-10000ms;
The interval that preferably excites of intermediate frequency focus is 1000ms-5000ms;
The interval that preferably excites of high frequency focus is 200ms-2000ms;
D, determine that earthquake towed cable records duration:
Increase and record duration, can retain more deep formation information; Reduce and record duration, can reduce acquisition and recording system burden, reduce storage data volume, reduce geological data aftertreatment workload;
According to investigation depth, require to determine, the seismic event stratum penetration capacity of low frequency epicenter excitation is strong, and the seismic event round-trip time is long, and the seismologic record time is long; A little less than the seismic event stratum penetration capacity of high frequency epicenter excitation, the seismic event round-trip time is short, and the seismologic record time is short; Generally,
The duration scope that preferably records of low frequency earthquake towed cable is 800ms-2000ms;
The duration scope that preferably records of intermediate frequency earthquake towed cable is 400ms-1000ms;
The duration scope that preferably records of high-frequency seism towing cable is 50ms-500ms;
E, determine trigger interval between many focus:
In conditions permit situation, reduce trigger interval between focus, to improve stratum lateral resolution;
Trigger interval between focus must not be less than the record length that gathers the towing cable of its signal after last focus triggers;
F, trigger focus and image data chronologically:
In the system of n focus of employing, according to the order from low frequency to high frequency, trigger successively focus, the trigger interval in phase imminent earthquake source is followed successively by T
1, T
2t
n-1;
The signal of n epicenter excitation is by k
nindividual towing cable gathers, and sets respectively its record length, and its maximal value is designated as L
n, and meet T
1> L
1, T
2> L
2..., T
n-1> L
n-1;
According to the trigger interval in the record length of the trigger interval of definite focus trigger sequence, same focus, each towing cable, phase imminent earthquake source, and selection zero moment point, by high precision clock module, determine corresponding moment point, time service module passes to binary channels earthquake-capturing module by signal, binary channels earthquake-capturing module triggers focus and the open streamer data that receives chronologically, exports storer or data handling system to.
Compared with prior art, beneficial effect of the present invention is embodied in:
Adopt the many towing cables of many focus of the present invention to trigger sequential control system and method, can set different investigation depths and resolution goals, adopt many cover focus and many towing cables to carry out data acquisition, focus triggers with data acquisition and carries out in order, the deep seismic data that can obtain large penetration depth in same one earthquake exploration, can obtain again high-resolution shallow earthquake data, complete more in high quality exploration targets, save resource, improved exploration efficiency.
Accompanying drawing explanation
Fig. 1 is that the many towing cables of many focus trigger sequential control system structured flowchart;
Fig. 2 is the two cable offshore shooting method work schematic diagram of two focus;
Fig. 3 is that two each ingredients of cable acquisition system of two focus connect schematic block diagram;
Fig. 4 a is the two cable acquisition system time synchronization control device sequential charts of two focus;
Fig. 4 b is the two cable acquisition system time synchronization control device sequential charts of two focus after shortening high frequency focus trigger interval;
Fig. 5 is two focus three cable offshore shooting method work schematic diagram;
Fig. 6 is that two each ingredients of focus three cable acquisition systems connect schematic block diagram;
Fig. 7 is two focus three cable acquisition system time synchronization control device sequential charts;
Fig. 8 is three focus three cable offshore shooting method work schematic diagram;
Fig. 9 is that each ingredient of three focus three cable acquisition systems connects schematic block diagram;
Figure 10 is three focus three cable acquisition system time synchronization control device sequential charts.
Label in figure is respectively:
100: control module; 201: low frequency focus; 202: intermediate frequency focus; 203: high frequency focus; 301: low frequency towing cable; 302: intermediate frequency towing cable; 303: high frequency towing cable; 401: shallow stratum; 402: middle stratum; 403: deep stratum.
Embodiment
Below in conjunction with accompanying drawing, introduce the embodiment that the many towing cables of the many focus of the present invention trigger sequential control system and method, but enforcement of the present invention is not limited to following embodiment.
In offshore shooting, use a surveying vessel, seismic exploration equipment is except focus and towing cable, also is furnished with control module, comprise central processing unit, binary channels earthquake-capturing module, high precision clock module, time service module, quantity and the focus of binary channels earthquake-capturing module, the quantity of towing cable matches, time service module is selected GPS time dissemination system conventionally, time signal is outputed to high precision clock module, high precision clock module and binary channels earthquake-capturing module are accurately controlled the excitation instant of each focus, the record of corresponding towing cable constantly with time record duration, make each epicenter excitation, layer data collection is carried out in order reflectingly, until data acquisition task, obtain the different seismic section data of many cover frequency contents simultaneously.
The wavelet spectrum of focus affects investigation depth and the stratigraphic resolution ability of seismic prospecting.When source wavelet frequency spectrum dominant frequency is lower, for example lower than 100Hz, stratum penetration capacity is for example greater than by force 1000m, the lower 10m that is for example greater than of stratigraphic resolution; When source wavelet frequency spectrum dominant frequency is higher, for example higher than 1000Hz, stratigraphic resolution height is for example better than 2m, the poor 200m that is for example less than of stratum penetration capacity., in the technical program, each overlaps excitation energy and wavelet spectrum between focus larger difference.For example, use air gun source and plasma focus, the wavelet spectrum of air gun source is in 100Hz left and right simultaneously, and the wavelet spectrum of plasma focus is in 1000Hz left and right.
Investigation depth and the stratigraphic resolution of the inside nautical receiving set configuration affects seismic prospecting of earthquake towed cable.Nautical receiving set combination number is many, and nautical receiving set dominant frequency is low, can receive deep seismic reflected signal; Nautical receiving set combination number is few, and nautical receiving set dominant frequency is high, shallow earthquake signal that can receiving high definition.In technical solution of the present invention, each towing cable is inner adopts different nautical receiving sets to configure, respectively for the seismic data that gathers different resolution and penetration depth.For example, use towing cable that 100 low frequency nautical receiving sets of internal configurations combine, that total length surpasses 200m, gather the seismic data that penetration depth surpasses 700m; Use 25 intermediate frequency nautical receiving sets of internal configurations towing cable combination, the about 50m of total length, gather the seismic data of the about 300m of penetration depth; Use 8 high frequency nautical receiving sets of internal configurations towing cable combination, the about 20m of total length, gather the seismic data of the about 150m of penetration depth.This method can obtain the deep seismic data of large penetration depth in same one earthquake exploration, can obtain again high-resolution shallow earthquake data, improves exploration efficiency.
Below in conjunction with embodiment, content of the present invention is illustrated.
Embodiment 1, and the two cables of two focus gather offshore shooting:
As shown in Figure 2, be the two cable offshore shooting method work schematic diagram of the two focus of the present invention.In figure, represent use low frequency hydrophone streamer and high frequency hydrophone streamer, two kinds of different frequency acquisitions and receive respectively the seismic signal that reflects 401Yu Zhong stratum, shallow stratum 402 from two focus writing time, two focus are respectively low frequency focus 201 and high frequency focus 203, obtain the two cover investigation depths seismic section different with resolution characteristic simultaneously.
As shown in Figure 3, concrete each ingredient of the two cable offshore shootings of two focus connects block diagram.Wherein two cable system for acquiring seismic data work in initiatively trigger mode, and interface F and interface S are two ports of binary channels earthquake-capturing module, Sequential output trigger pip.Interface F trigger pip is for example used for triggering high frequency focus, plasma focus, and interface S trigger pip is for example used for triggering low frequency focus, air gun source.For example, after plasma epicenter excitation, seismic reflection signals is received by high frequency hydrophone streamer high frequency focus, and two cable system for acquiring seismic data interface F gather; For example, after air gun source excites, seismic reflection signals is received by low frequency hydrophone streamer low frequency focus, by two cable system for acquiring seismic data interface F, is gathered.
Fig. 4 a and Fig. 4 b have provided two kinds of triggering sequential instance graphs of the two cable seismic acquisition configurations of two focus, in figure:
1. low frequency focus trigger interval;
2. high frequency focus trigger interval;
3. trigger interval between low frequency focus and high frequency focus;
4. low frequency hydrophone streamer record length;
5. high frequency hydrophone streamer record length.
As shown in Fig. 4 a, low frequency epicenter excitation interval 4500ms, respectively at 0ms, 4500ms, 9000ms ... Shi Jifa.After low frequency epicenter excitation, low frequency hydrophone streamer receives seismic reflection signals, record length 800ms.High frequency epicenter excitation interval 4500ms, respectively at 1500ms, 6000ms ... Shi Jifa.After high frequency epicenter excitation, high frequency hydrophone streamer receives seismic reflection signals, record length 500ms.Between low frequency epicenter excitation and high frequency epicenter excitation, trigger interval must not be less than low frequency hydrophone streamer record length.
Under high frequency epicenter excitation speed enabled condition, can reduce it and excite interval, as shown in Figure 4 b.Low frequency epicenter excitation interval 4500ms, respectively at 0ms, 4500ms, 9000ms ... Shi Jifa.After low frequency epicenter excitation, low frequency hydrophone streamer receives seismic reflection signals, record length 800ms.High frequency epicenter excitation interval 1500ms, respectively at 1500ms, 3000ms, 6000ms, 7500ms ... Shi Jifa.After high frequency epicenter excitation, high frequency hydrophone streamer receives seismic reflection signals, record length 500ms.Between low frequency epicenter excitation and high frequency epicenter excitation, trigger interval must not be less than low frequency hydrophone streamer record length.
The superficial reflex record that high frequency focus receives as plasma epicenter excitation, high frequency hydrophone streamer, seismic section radio-frequency component is abundant, resolution 2～3m, what the form of various seismic facies reflected is perfectly clear; Low frequency focus, as the mid-deep strata reflection record that air gun source excites, low-frequency cable receives, has reflected depositional texture and the structural feature in middle level preferably.In an exploration process, can obtain the seismic section data that two cover frequency contents are different simultaneously, due to the stratum of research different depth, not only improve resolution but also increased penetration depth respectively, obtain good Effect on Detecting.
Embodiment 2, and two focus three cables gather offshore shooting:
As shown in Figure 5, be the two focus three cable offshore shooting work schematic diagram of the present invention.In figure, represent to use towing cable of a low frequency nautical receiving set, intermediate frequency hydrophone streamer and high frequency hydrophone streamer, three kinds of different frequency acquisitions and receive respectively the seismic signal from shallow stratum 401, middle stratum 402 and the deep stratum 403 of two focus reflections writing time, two focus divide respectively low frequency focus and high frequency focus, obtain the three cover investigation depths seismic section different with resolution characteristic simultaneously.
As shown in Figure 6, concrete each ingredient for the two focus three cable offshore shooting methods of the present invention connects block diagram.Wherein three cable system for acquiring seismic data interface F and interface S are two ports of first binary channels earthquake-capturing module, the pattern that has the initiative of working, Sequential output trigger pip.Interface F trigger pip is for example used for triggering high frequency focus, plasma focus, and interface S trigger pip is for example used for triggering wideband focus, air gun source.Three cable system for acquiring seismic data interface M are one of them port of second binary channels earthquake-capturing module, work in Passive Mode, and trigger pip is provided by the interface S of two cable system for acquiring seismic data.For example, after plasma epicenter excitation, seismic reflection signals is received by high frequency hydrophone streamer high frequency focus, and three cable system for acquiring seismic data interface F gather; For example, after air gun source excites, seismic reflection signals is received by intermediate frequency hydrophone streamer and low frequency hydrophone streamer low frequency focus simultaneously, is gathered respectively by three cable system for acquiring seismic data interface M and interface S.
Fig. 7 has provided the triggering sequential instance graph of two focus three cable seismic acquisition configurations, in figure:
1. low frequency focus trigger interval;
2. high frequency focus trigger interval;
3. trigger interval between low frequency focus and high frequency focus;
4. low frequency hydrophone streamer record length;
5. intermediate frequency hydrophone streamer record length;
6. high frequency hydrophone streamer record length.
As shown in Figure 7, low frequency epicenter excitation interval 4500ms, respectively at 0ms, 4500ms, 9000ms ... Shi Jifa.After low frequency epicenter excitation, low frequency hydrophone streamer, intermediate frequency hydrophone streamer receive respectively seismic reflection signals, low frequency hydrophone streamer record length 1100ms, intermediate frequency hydrophone streamer record length 800ms.High frequency epicenter excitation interval 1500ms, respectively at 1500ms, 3000ms, 6000ms, 7500ms ... Shi Jifa.After high frequency epicenter excitation, high frequency hydrophone streamer receives seismic reflection signals, record length 500ms.Between low frequency epicenter excitation and high frequency epicenter excitation, trigger interval must not be less than low frequency hydrophone streamer record length.
High frequency focus for example, the superficial reflex record that plasma epicenter excitation, high frequency hydrophone streamer receive, seismic section radio-frequency component is abundant, resolution 2～3m, being perfectly clear of the form reflection of various seismic facies; For example, the mid-deep strata reflection record that air gun source excites, intermediate frequency and low-frequency cable receive, in having reflected preferably, depositional texture and the structural feature of deep layer for low frequency focus.In an exploration process, can obtain the seismic section data that three cover frequency contents are different simultaneously, due to the stratum of research different depth, not only improve resolution but also increased penetration depth respectively, obtain good Effect on Detecting.
Embodiment 3, three focus three cables gather offshore shooting.
As shown in Figure 8, be the present invention's three focus three cable offshore shooting work schematic diagram.In figure, represent to use towing cable of a low frequency nautical receiving set, intermediate frequency hydrophone streamer and high frequency hydrophone streamer, three kinds of different frequency acquisitions and receive respectively the seismic signal from shallow stratum 401, middle stratum 402 and the deep stratum 403 of three focus reflections writing time, three focus divide respectively low frequency focus, intermediate frequency focus and high frequency focus, obtain the three cover investigation depths seismic section different with resolution characteristic simultaneously.
As shown in Figure 9, concrete each ingredient for the present invention's three focus three cable offshore shooting methods connects block diagram.Wherein three cable system for acquiring seismic data work in aggressive mode, interface F, interface M are two ports of first binary channels earthquake-capturing module, interface S is one of them port of second binary channels earthquake-capturing module, interface F, interface M, interface S Sequential output trigger pip.Interface F trigger pip is for example used for triggering high frequency focus, Boomer focus, and interface M trigger pip is for example used for triggering intermediate frequency focus, plasma focus, interface S trigger pip is for example used for triggering low frequency focus, air gun source.For example, after Boomer epicenter excitation, seismic reflection signals is received by high frequency hydrophone streamer high frequency focus, and three cable system for acquiring seismic data interface F gather; For example, after plasma epicenter excitation, seismic reflection signals is received by intermediate frequency hydrophone streamer intermediate frequency focus, and three cable system for acquiring seismic data interface M gather; For example, after air gun source excites, seismic reflection signals is received by low frequency hydrophone streamer low frequency focus simultaneously, by three cable system for acquiring seismic data interface S, is gathered.
Figure 10 has provided the triggering sequential instance graph of three focus three cable seismic acquisition configurations, in figure:
1. low frequency focus trigger interval;
2. trigger interval between low frequency focus and intermediate frequency focus;
3. trigger interval between intermediate frequency focus and high frequency focus;
4. the record length of low frequency hydrophone streamer;
5. the record length of intermediate frequency hydrophone streamer;
6. the record length of high frequency hydrophone streamer.
As shown in figure 10, low frequency epicenter excitation interval 4500ms, respectively at 0ms, 4500ms, 9000ms ... Shi Jifa; After low frequency epicenter excitation, low frequency hydrophone streamer receives seismic reflection signals, low frequency hydrophone streamer record length 1100ms.Intermediate frequency epicenter excitation interval 4500ms, respectively at 1500ms, 6000ms ... Shi Jifa; After intermediate frequency epicenter excitation, intermediate frequency hydrophone streamer receives seismic reflection signals, record length 800ms.High frequency epicenter excitation interval 4500ms, respectively at 3000ms, 7500ms ... Shi Jifa; After high frequency epicenter excitation, high frequency hydrophone streamer receives seismic reflection signals, record length 500ms.Between epicenter excitation, trigger interval must not be less than hydrophone streamer record length.
High frequency focus for example, the utmost point superficial reflex record that Boomer epicenter excitation, high frequency hydrophone streamer receive, stratum penetration depth 50m, resolution 0.3m; Intermediate frequency focus for example, the middle level reflection record that plasma epicenter excitation, intermediate frequency hydrophone streamer receive, stratum penetration depth 500m, resolution 2m, being perfectly clear of the form reflection of various seismic facies; Low frequency focus for example, the deep reflex record that air gun source excites, low-frequency cable receives, stratum penetration depth 1000m, the about 20m of resolution, has reflected depositional texture and the structural feature of deep layer preferably.In an exploration process, can obtain the seismic section data that three cover frequency contents are different simultaneously, due to the stratum of research different depth, not only improve resolution but also increased penetration depth respectively, obtain good Effect on Detecting.
The present invention only describes with above-described embodiment; the focus that embodiment selects and number of streamers are all in 3; but the many towing cables triggering sequential control systems of many focus of the present invention and method are all suitable for for the survey system of the many towing cables of many focus; on the basis of technical solution of the present invention; all different choice or device equivalents of carrying out quantity according to the principle of the invention, all should not get rid of outside protection scope of the present invention.
Claims (7)
1. the many towing cables of focus more than trigger sequential control system, it is characterized in that, comprise towing cable, focus, control module, described control module comprises central processing unit, binary channels earthquake-capturing module, high precision clock module, time service module.
2. the many towing cables of many focus according to claim 1 trigger sequential control system, it is characterized in that comprising two above towing cables and the above focus of two covers, and number of streamers more than or equal focus quantity.
3. the many towing cables of many focus according to claim 2 trigger sequential control system, it is characterized in that a set of above binary channels earthquake-capturing module corresponding with towing cable and focus quantity of described control module configuration, a set of binary channels earthquake-capturing module is carried two towing cables and two cover focus.
4. according to the many towing cables of the many focus described in claim 1 or 2 or 3, trigger sequential control system, it is characterized in that every described towing cable inside at least disposes 6 nautical receiving set combinations.
5. according to the many towing cables of the many focus described in claim 1 or 2 or 3, trigger sequential control system, it is characterized in that every described towing cable internal configurations has 6～120 nautical receiving set combinations.
6. according to the many towing cables of the many focus described in claim 1 or 2 or 3, trigger sequential control system, it is characterized in that described focus is one or more in air gun source, hydraulic giant focus, plasma focus, Boomer focus.
7. the many cables of focus more than trigger sequential control method, it is characterized in that comprising the following steps:
A, selection focus:
Epicenter excitation energy is directly proportional to investigation depth, but is inversely proportional to its wavelet spectrum size, in addition, although the focus that selective excitation energy is large can obtain the seismic section of layer deeper, but its resolution is low, according to the requirement of investigation depth and resolution, select suitable focus or its combination;
By excitation energy order from big to small, conventional focus includes but not limited to air gun source, hydraulic giant focus, plasma focus, Boomer focus etc.; Air gun source wavelet dominant frequency is in 10～250Hz left and right; The frequency spectrum dominant frequency of hydraulic giant is 250～1500Hz approximately; The frequency spectrum dominant frequency of plasma focus is 300～1700Hz approximately; The frequency spectrum dominant frequency of Boomer focus is 500～3000Hz approximately;
It has been generally acknowledged that, the focus of frequency spectrum dominant frequency 10～600Hz is low frequency focus, and investigation depth is about 0.8～10km, and resolution is about 8～120m;
The focus of frequency spectrum dominant frequency 600～1500Hz is intermediate frequency focus, and investigation depth is about 100～800m, and resolution is about 1～8m;
Focus more than frequency spectrum dominant frequency 1500Hz is high frequency focus, and investigation depth is below 100m, and resolution reaches even sub-meter grade of meter level;
B, selection towing cable
According to the requirement of investigation depth and resolution, select the inner towing cable that adopts different nautical receiving set configurations, the nautical receiving set configuration of towing cable adapts with source type and its frequency spectrum dominant frequency size of its collection signal;
Determine the corresponding relation of towing cable and focus, the signal of same epicenter excitation is by corresponding one or more towing cable collection;
Normally, high-frequency seism towing cable, the combination of 6～12 nautical receiving sets of choice for use internal configurations, the about towing cable of 15～25m of total length, the about 500Hz～12kHz of nautical receiving set dominant frequency;
Intermediate frequency earthquake towed cable, the combination of 20～25 nautical receiving sets of choice for use internal configurations, the about towing cable of 40～60m of total length, the about 20Hz～10kHz of nautical receiving set dominant frequency;
Low frequency earthquake towed cable, 80～120 nautical receiving sets of choice for use internal configurations combine, total length surpasses the towing cable of 200m, the about 10Hz～1kHz of nautical receiving set dominant frequency;
C, determine focus trigger interval:
In conditions permit situation, reduce focus trigger interval, to improve stratum lateral resolution;
Comparatively speaking, for low frequency focus, excitation energy is large, and the seismic event stratum penetration capacity exciting is strong, and accumulation of energy required time is long, sets trigger interval large; High frequency epicenter excitation energy is less, and a little less than the seismic event stratum penetration capacity exciting, the seismic event round-trip time is short, and accumulation of energy required time is short, sets trigger interval little;
D, determine that earthquake towed cable records duration:
Increase and record duration, can retain more deep formation information; Reduce and record duration, can reduce acquisition and recording system burden, reduce storage data volume, reduce geological data aftertreatment workload;
According to investigation depth, require to determine, the seismic event stratum penetration capacity of low frequency epicenter excitation is strong, and the seismic event round-trip time is long, and the seismologic record time is long; A little less than the seismic event stratum penetration capacity of high frequency epicenter excitation, the seismic event round-trip time is short, and the seismologic record time is short;
E, determine trigger interval between many focus:
In conditions permit situation, reduce trigger interval between focus, to improve stratum lateral resolution;
Trigger interval between focus must not be less than the record length that gathers the towing cable of its signal after last focus triggers;
F, trigger focus and image data chronologically:
In the system of n focus of employing, according to the order from low frequency to high frequency, trigger successively focus, the trigger interval in phase imminent earthquake source is followed successively by T
1, T
2t
n-1;
The signal of n epicenter excitation is by k
nindividual towing cable gathers, and sets respectively its record length, and its maximal value is designated as L
n, and meet T
1> L
1, T
2> L
2..., T
n-1> L
n-1;
According to the trigger interval in the record length of the trigger interval of definite focus trigger sequence, same focus, each towing cable, phase imminent earthquake source, and selection zero moment point, by high precision clock module, determine corresponding moment point, time service module passes to binary channels earthquake-capturing module by signal, binary channels earthquake-capturing module triggers focus and the open streamer data that receives chronologically, exports storer or data handling system to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410286261.4A CN104049278B (en) | 2014-06-24 | 2014-06-24 | More more towing cables of focus trigger sequential control system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410286261.4A CN104049278B (en) | 2014-06-24 | 2014-06-24 | More more towing cables of focus trigger sequential control system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104049278A true CN104049278A (en) | 2014-09-17 |
| CN104049278B CN104049278B (en) | 2017-12-12 |
Family
ID=51502361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410286261.4A Active CN104049278B (en) | 2014-06-24 | 2014-06-24 | More more towing cables of focus trigger sequential control system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104049278B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502958A (en) * | 2014-12-17 | 2015-04-08 | 程露杨 | Novel seismic prospecting instrument and method for prospecting by adopting same |
| CN104536034A (en) * | 2015-01-08 | 2015-04-22 | 吉林大学 | Multi-seismic-resource parallel motivation collecting and hybrid seismic record separating method |
| CN106324703A (en) * | 2016-08-08 | 2017-01-11 | 中国石油天然气集团公司 | Air gun fault detection method and system |
| CN107515422A (en) * | 2017-08-30 | 2017-12-26 | 中国海洋大学 | A kind of high-precision shallow seismic profile acquisition system |
| CN109239782A (en) * | 2018-08-30 | 2019-01-18 | 广州海洋地质调查局 | A kind of fine seismic prospecting system and method for gas hydrates |
| CN111123348A (en) * | 2019-12-30 | 2020-05-08 | 浙江大学 | Plasma seismic source system for high-resolution detection of fresh water shallow stratum |
| WO2020097844A1 (en) * | 2018-11-15 | 2020-05-22 | 国家海洋局第二海洋研究所 | Combined virtual and real depths-based marine wideband air gun seismic sources |
| CN111201453A (en) * | 2017-08-16 | 2020-05-26 | Pgs 地球物理公司 | Geophysical survey techniques using selective length processing |
| CN111308474A (en) * | 2020-03-11 | 2020-06-19 | 自然资源部第二海洋研究所 | Towed deep sea seabed shallow structure acoustic detection system and method |
| CN111551986A (en) * | 2020-06-08 | 2020-08-18 | 青岛海洋科学与技术国家实验室发展中心 | Seismic source system and operation method thereof |
| CN111948703A (en) * | 2019-05-17 | 2020-11-17 | 中国石油天然气集团有限公司 | Seismic exploration method and device excited by mixed seismic source |
| WO2022047680A1 (en) * | 2020-09-02 | 2022-03-10 | 中国海洋大学 | High-precision measurement device for plasma seismic source wavelets under shallow water condition |
| CN114895349A (en) * | 2022-04-23 | 2022-08-12 | 中国海洋大学 | Multi-target-oriented observation system and design method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090141587A1 (en) * | 2004-02-23 | 2009-06-04 | Westerngeco, L.L.C. | Marine seismic survey method and system |
| CN101706584A (en) * | 2009-11-29 | 2010-05-12 | 中国海洋大学 | High-precision oceanic earthquake exploration data acquisition system |
| CN101915937A (en) * | 2010-07-16 | 2010-12-15 | 中国海洋石油总公司 | Seismic data recording method and system of marine streamer |
| CN103344991A (en) * | 2013-05-03 | 2013-10-09 | 中国海洋石油总公司 | Dual-source earthquake collection method and collection system for offshore seismic exploration |
-
2014
- 2014-06-24 CN CN201410286261.4A patent/CN104049278B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090141587A1 (en) * | 2004-02-23 | 2009-06-04 | Westerngeco, L.L.C. | Marine seismic survey method and system |
| CN101706584A (en) * | 2009-11-29 | 2010-05-12 | 中国海洋大学 | High-precision oceanic earthquake exploration data acquisition system |
| CN101915937A (en) * | 2010-07-16 | 2010-12-15 | 中国海洋石油总公司 | Seismic data recording method and system of marine streamer |
| CN103344991A (en) * | 2013-05-03 | 2013-10-09 | 中国海洋石油总公司 | Dual-source earthquake collection method and collection system for offshore seismic exploration |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502958A (en) * | 2014-12-17 | 2015-04-08 | 程露杨 | Novel seismic prospecting instrument and method for prospecting by adopting same |
| CN104536034A (en) * | 2015-01-08 | 2015-04-22 | 吉林大学 | Multi-seismic-resource parallel motivation collecting and hybrid seismic record separating method |
| CN104536034B (en) * | 2015-01-08 | 2017-02-22 | 吉林大学 | Multi-seismic-resource parallel motivation collecting and hybrid seismic record separating method |
| CN106324703A (en) * | 2016-08-08 | 2017-01-11 | 中国石油天然气集团公司 | Air gun fault detection method and system |
| CN111201453A (en) * | 2017-08-16 | 2020-05-26 | Pgs 地球物理公司 | Geophysical survey techniques using selective length processing |
| CN107515422A (en) * | 2017-08-30 | 2017-12-26 | 中国海洋大学 | A kind of high-precision shallow seismic profile acquisition system |
| CN107515422B (en) * | 2017-08-30 | 2019-04-19 | 中国海洋大学 | A kind of high-precision shallow seismic profile acquisition system |
| CN109239782A (en) * | 2018-08-30 | 2019-01-18 | 广州海洋地质调查局 | A kind of fine seismic prospecting system and method for gas hydrates |
| WO2020097844A1 (en) * | 2018-11-15 | 2020-05-22 | 国家海洋局第二海洋研究所 | Combined virtual and real depths-based marine wideband air gun seismic sources |
| CN111948703A (en) * | 2019-05-17 | 2020-11-17 | 中国石油天然气集团有限公司 | Seismic exploration method and device excited by mixed seismic source |
| CN111948703B (en) * | 2019-05-17 | 2023-07-25 | 中国石油天然气集团有限公司 | Seismic exploration method and device for mixed seismic source excitation |
| CN111123348A (en) * | 2019-12-30 | 2020-05-08 | 浙江大学 | Plasma seismic source system for high-resolution detection of fresh water shallow stratum |
| CN111308474A (en) * | 2020-03-11 | 2020-06-19 | 自然资源部第二海洋研究所 | Towed deep sea seabed shallow structure acoustic detection system and method |
| CN111308474B (en) * | 2020-03-11 | 2021-12-21 | 自然资源部第二海洋研究所 | Towed deep sea seabed shallow structure acoustic detection system and method |
| CN111551986A (en) * | 2020-06-08 | 2020-08-18 | 青岛海洋科学与技术国家实验室发展中心 | Seismic source system and operation method thereof |
| CN111551986B (en) * | 2020-06-08 | 2024-05-03 | 青岛海洋科学与技术国家实验室发展中心 | Seismic source system and operation method thereof |
| WO2022047680A1 (en) * | 2020-09-02 | 2022-03-10 | 中国海洋大学 | High-precision measurement device for plasma seismic source wavelets under shallow water condition |
| CN114895349A (en) * | 2022-04-23 | 2022-08-12 | 中国海洋大学 | Multi-target-oriented observation system and design method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104049278B (en) | 2017-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104049278A (en) | Multi-earthquake-source multi-towline trigger timing control system and method | |
| AU2020217393B2 (en) | Seismic Data Acquisition | |
| CA2727439C (en) | Marine seismic acquisition with controlled streamer flaring | |
| CN103344991B (en) | A kind of double source earthquake collection method for offshore seismic exploration and acquisition system | |
| CN109444896A (en) | Underwater sound array positioning system and its localization method | |
| CN103645497A (en) | Emergence angle based multi-component wave field separation method | |
| CN104570087A (en) | Method for performing seismic data first break and event pickup extraction through instantaneous attributes | |
| AU2017269283A1 (en) | Distributed seismic node computing | |
| AU2015200555B2 (en) | Correction of sea surface state | |
| CN116413811A (en) | Marine seismic exploration method and device and marine geological exploration ship | |
| CN204374436U (en) | Many focus many towing cables activation schedule control system | |
| GB2525072A (en) | Correction of sea surface state | |
| CN109683199A (en) | A kind of multi-source random excitation earthquake collection method for offshore seismic exploration | |
| CN103412334B (en) | A kind of double source method of seismic prospecting for offshore seismic exploration and system | |
| CN112241020B (en) | Method and device for determining undersampling rate in sparse seismic data acquisition | |
| CN112285782B (en) | Near-surface seismic wave absorption attenuation investigation method and device | |
| CN117471533A (en) | Three-dimensional seismic exploration method, device, equipment and medium based on single towing rope | |
| NO20160048A1 (en) | Survey coverage parameters | |
| GB2589191A (en) | Surveying with low frequency impulse sources | |
| CN111983673A (en) | Method and device for determining receiving line distance of three-dimensional seismic observation system | |
| CN109521463A (en) | Determine the method and system of the best earthquake excitation li thology of igneous rock near surface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Baohua Inventor after: Pei Yanliang Inventor after: Liu Chenguang Inventor after: Li Xishuang Inventor after: Sun Lei Inventor before: Li Baohua Inventor before: Pei Yanliang Inventor before: Liu Chenguang Inventor before: Li Xishuang Inventor before: Sun Lei |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI BAOHUA PEI YANLIANG LIU CHENGUANG LI XISHUANG SUN LEI TO: LIU BAOHUA PEI YANLIANG LIU CHENGUANG LI XISHUANG SUN LEI |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |