CN2657018Y - Near sea engineering multipath high distinguishability ocean seismic prospecting survey receiving cable - Google Patents
Near sea engineering multipath high distinguishability ocean seismic prospecting survey receiving cable Download PDFInfo
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- CN2657018Y CN2657018Y CN 200320107289 CN200320107289U CN2657018Y CN 2657018 Y CN2657018 Y CN 2657018Y CN 200320107289 CN200320107289 CN 200320107289 CN 200320107289 U CN200320107289 U CN 200320107289U CN 2657018 Y CN2657018 Y CN 2657018Y
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- nautical receiving
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Abstract
A multi-channels high resolution marine seismic exploration receiving cable for offshore engineering comprises a traction section, a front elastic section, a working section and a rear elastic section, wherein, the working section is provided with sheath filled with grease, one end of which has a joint provided with a socket inside and connected with a one-way grease valve. The working section, which is provided with a plurality of hydrophones, a stretcher and a linear array inside, is characterized in that: a first channel consists of a single hydrophone and other channels two hydrophones; each channel is provided with a preamplifier; the two hydrophones inside the channel are connected in parallel, one is connected with the preamplifier, the other with the linear array connected with the socket of the cable. The utility model has the advantages that: a. the sensitivity is high (-90db re 1V/Mub a r plus or minus 3db); b. the frequency response range is wide(10Hz-10kHz)and straight, with a fluctuation of plus or minus 3db; c. being suitable to water depth from 5 to 50 meters; d. the detecting depth is more than 20 meters; e. the stratigraphic resolution can reach 0.3 meters.
Description
Technical field
The utility model relates to a kind of cable, particularly relates to a kind of offshore engineering multiple tracks high resolving power offshore shooting and receives cable.
Background technology
Multichannel seismic exploration both domestic and external receives cable and is mostly the tens long array low-frequency cables to thousands of roads, and the supreme km of investigation depth hundreds of receives dominant frequency greatly about about tens hertz, about ten to tens meters of resolution.In recent years, relevant units at home and abroad has developed the multiple tracks cable of some high-resolution in order to satisfy the needs of economic construction, because the unitized construction of its nautical receiving set, resolution only on several meters the order of magnitude, is applicable to the mid-deep strata seismic prospecting.And the offshore engineering seismic prospecting requires the reception cable to be applicable to several meters to tens meters the depth of water, flexible and convenient to use, generally require the tens of rice of investigation depth to hundred meters, resolution is higher than meter level, obviously above-mentioned tens is too huge to the long array cable in thousands of roads, can't use in the shoal water zone, and resolution often can not satisfy the technical requirement of coastal waters (5～50 meters depth of water) engineering seismology exploration.In addition the earthquake of shallow-layer multiple tracks receive cable with in, that the earthquake of deep layer multiple tracks receives cable is different owing to its research object and target, there are differences in receiver section signal transmssion line battle array, track pitch, nautical receiving set combination, during existing homemade engineering multiple tracks cable has followed, the earthquake of deep layer multiple tracks receives the structure of cable, cause receiving the frequency spectrum distortion of seismic signal, reduced the resolution of cable.
Summary of the invention
The purpose of this utility model provides a kind of offshore engineering multiple tracks high resolving power offshore shooting and receives cable, and it can overcome the above-mentioned shortcoming of prior art.
A kind of offshore engineering multiple tracks high resolving power offshore shooting receives cable, the traction section is arranged, preceding stretch section, active section and back stretch section, this active section has crust, interior filling oil, its end has joint, the built-in socket of the latter, joint connect a unidirectional fuel feeding valve, and this active section is built-in with a plurality of nautical receiving sets, chapelet and linear array are arranged, it is characterized in that first road is made up of single nautical receiving set, all the other each roads are formed by two nautical receiving sets, and prime amplifier all is housed in the per pass, two nautical receiving sets in the road are connected in parallel, a nautical receiving set is connected with prime amplifier, and the latter is connected with linear array, and linear array is connected on the socket of cable.
The utility model has the advantages that a. highly sensitive-90db re 1V/ μ bar ± 3db; B. the wide 10Hz-10kHz of frequency response range is straight, fluctuation ± 3db; C. be fit to the 5-50 rice depth of water; D. investigation depth is greater than 120 meters; E. stratigraphic resolution can reach 0.3 meter.
Description of drawings and embodiment
Accompanying drawing is the structural representation of the utility model active section.
The utility model is divided into four sections, is respectively traction section, preceding stretch section, active section and back stretch section, 175 meters of length overalls.Described active section has cable sheath 1, is made by polyurethane material, and cable filling oil 2 is wherein arranged, for example light cured oil.One end of this active section has joint 3, and built-in socket 4 is used for connecting and the signal transmission, and joint 3 connects a unidirectional fuel feeding valve 5, is used in cable oil-filled.This active section is built-in with 49 nautical receiving sets 6,, this nautical receiving set 6 is the piezoelectric ceramics cast, and is highly sensitive, frequency response is wide, first road is made up of single nautical receiving set 6, receives the source wavelet signal, and all the other each roads are formed by two nautical receiving sets 6, totally 25 roads, 3.125 meters of track pitches, combination are apart from 15 centimetres, and its distance is less than the half-wavelength of seismic signal.Totally 25 of prime amplifiers 7 all are housed in the per pass, and power supply 5～15DC directly improves signal to noise ratio (S/N ratio), and the loss of compensating signal transmission.Two nautical receiving sets 6 in the road are connected in parallel, and a nautical receiving set 6 is connected with prime amplifier 7.This active section is built-in with chapelet 8, and 15 centimetres of its spacings are used for fixing the parts in the active section, and guarantee that the tubulose form of cable is constant.9 three of Kraft stay cords are arranged in this active section, and what make cable bears pulling force greater than 2 tons.And be equipped with linear array 10, long 80 meters, one of supply lines is wherein arranged, 25 pairs of multiple twin signal transmssion lines.The electronic component connected mode is welding and grafting.Power supply and signal transmission form are the common mode mode.
When using the utility model, cable is wrapped on the winch, and prime amplifier is connected with shipborne signal receiver, signal wire and ground wire.During construction, work ship lowsteaming, cable is put into marine, and linear array 10 is connected on the socket of cable.The output plug of linear array 10 links to each other with 25 road receiving record instrument, and supplies with operating voltage.During construction operation, the earthquake reflected wave signal that cable receives changes voltage signal into through nautical receiving set 6 and prime amplifier 7, is transferred to the receiving record instrument, is gathered and record by it.
80 meters of receiver section segment lengths guarantee the relative error of effective velocity
Minimum, and can effectively eliminate the repeatedly reflection wave of shoal water zone.Density is 1.03, floating function such as has in seawater.
Claims (2)
1, a kind of offshore engineering multiple tracks high resolving power offshore shooting receives cable, the traction section is arranged, preceding stretch section, active section and back stretch section, this active section has crust (1), interior filling oil (2), its end has joint (3), the built-in socket of the latter (4), joint (3) connects a unidirectional fuel feeding valve (5), this active section is built-in with a plurality of nautical receiving sets (6), chapelet (8) and linear array (10) are arranged, it is characterized in that first road is made up of single nautical receiving set (6), all the other each roads are formed by two nautical receiving sets (6), and prime amplifier (7) all is housed in the per pass, two nautical receiving sets (6) in the road are connected in parallel, a nautical receiving set (6) is connected with prime amplifier (7), and the latter is connected with linear array (10), and linear array (10) is connected on the socket of cable.
2, reception cable as claimed in claim 1 is characterized in that described nautical receiving set (6) has 49, and first road is made up of single nautical receiving set (6), and all the other each roads are formed by two nautical receiving sets (6), totally 25 roads, and track pitch is 3.125 meters, combination is apart from being 15 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320107289 CN2657018Y (en) | 2003-11-22 | 2003-11-22 | Near sea engineering multipath high distinguishability ocean seismic prospecting survey receiving cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320107289 CN2657018Y (en) | 2003-11-22 | 2003-11-22 | Near sea engineering multipath high distinguishability ocean seismic prospecting survey receiving cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2657018Y true CN2657018Y (en) | 2004-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320107289 Expired - Fee Related CN2657018Y (en) | 2003-11-22 | 2003-11-22 | Near sea engineering multipath high distinguishability ocean seismic prospecting survey receiving cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2657018Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1932554B (en) * | 2006-10-11 | 2010-05-12 | 中国海洋石油总公司 | Marine tow line array double-wing automatic fixing depth device |
| CN103680727A (en) * | 2013-12-05 | 2014-03-26 | 天津市远海声学仪器有限公司 | Towed damping cable for marine seismic prospecting |
-
2003
- 2003-11-22 CN CN 200320107289 patent/CN2657018Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1932554B (en) * | 2006-10-11 | 2010-05-12 | 中国海洋石油总公司 | Marine tow line array double-wing automatic fixing depth device |
| CN103680727A (en) * | 2013-12-05 | 2014-03-26 | 天津市远海声学仪器有限公司 | Towed damping cable for marine seismic prospecting |
| CN103680727B (en) * | 2013-12-05 | 2015-11-18 | 天津市远海声学仪器有限公司 | A kind of pull-type damping cable for marine seismic prospectiong |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |