Earthquake acquisition system

Abstract

The utility model discloses an earthquake acquisition system, which comprises an umbilical cable, a ship automatic identification system, a stroboscope lamp, an earthquake source, a cable winch and a distributed optical fiber towing cable, wherein the umbilical cable is connected with the collection mother ship and the towed body; the automatic ship identification system and the stroboscope lamp are mounted above the towed body; the vibration source is mounted below the towed body; the cable winch is used for being installed above the towed body. The cable winch is connected with the distributed optical fiber towing cable; the mother ship is connected with the towed body through an umbilical cable and supplies power to the towed body; the towed body is used for bearing the seismic source, the stroboscope lamp, the ship automatic identification system and the cable winch. The technical scheme of the embodiment of the utility model discloses an earthquake acquisition system, which can integrate an earthquake source, a distributed optical fiber towing cable, a cable winch and the like on one towed body, can realize modularization of the whole acquisition system, can be quickly deployed, has the characteristics of integration of earthquake and detection, small size and portability, has low requirements on a carried acquisition mother ship, and is convenient to carry. And the characteristics of low collection cost, ultra-shallow operation water depth and the like can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of earthquake detection, in particular to a earthquake acquisition system. Background Art

[0002] Offshore two-dimensional towed seismic exploration is one of the important means of detecting marine seabed resources, seabed engineering and disasters. Generally speaking, the seismic exploration system is carried on the exploration mother ship, mainly including the source cable, receiving cable (detector), signal acquisition unit, navigation and positioning system, etc. The minimum track spacing is 3.125 meters. The cable seismic tow cable uses a piezoelectric detector with a diameter of about 50mm, which has high requirements for the exploration mother ship (large tonnage, wide rear deck, etc.).

[0003] At present, with the continuous development of my country's marine economy, marine oil and gas surveys have become more detailed, and nearshore engineering exploration and marine disaster investigations have continued to deepen. The existing equipment can no longer meet the demand, especially nearshore shallow water surveys, which usually use single-channel seismic and shallow profiling (both with one detector), and the accuracy of stratum imaging is relatively low, which greatly limits the demand for detailed nearshore investigations. Utility Model Content

[0004] The utility model provides a seismic acquisition system to solve the problem that in the past, seismic exploration had high requirements on the acquisition mother ship and could not be applied to fine geological survey of near-shore shallow water.

[0005] According to one aspect of the utility model, there is provided a seismic acquisition system, the system comprising at least an umbilical cable, an automatic ship identification system, a strobe light, a seismic source, a cable winch, and a distributed optical fiber streamer;

[0006] Among them, the umbilical cable connects the acquisition mother ship and the towing body; the ship automatic identification system and the strobe light are installed above the towing body; the seismic source is installed below the towing body; the cable winch is used to be installed above the towing body; the cable winch is connected to the distributed optical fiber tow cable; the mother ship is used to connect the towing body through the umbilical cable and supply power to the towing body; the towing body is used to carry the seismic source, the strobe light, the ship automatic identification system and the cable winch.

[0007] The technical solution of the embodiment of the utility model can integrate the seismic source, distributed optical fiber towline and cable winch into one towed body, so as to realize modularization of the whole acquisition system and enable rapid deployment. It has the characteristics of integrated seismic detection and small portability, has low requirements on the acquisition mother ship, and can realize the characteristics of low acquisition cost and ultra-shallow operating water depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of a seismic acquisition system provided according to an embodiment of the utility model. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0010] Figure 1 A structural schematic diagram of a seismic acquisition system is provided for an embodiment of the utility model. The embodiment can be applicable to the detection of marine seabed resources, seabed engineering and disasters. A seismic acquisition system provided by an embodiment of the utility model can integrate the seismic source, distributed optical fiber towline and cable winch into a towed body, so as to realize modularization of the entire acquisition system and enable rapid deployment. It has the characteristics of integrated seismic detection and small portability, has low requirements on the acquisition mother ship, and can realize the characteristics of low acquisition cost and ultra-shallow operating depth.

[0011] like Figure 1 As shown, the seismic acquisition system includes at least an umbilical cable, an automatic ship identification system, a strobe light, a seismic source, a cable winch, and a distributed optical fiber streamer.

[0012] Among them, the umbilical cable connects the acquisition mother ship and the towing body; the ship automatic identification system and the strobe light are installed above the towing body; the seismic source is installed below the towing body; the cable winch is used to be installed above the towing body; the cable winch is connected to the distributed optical fiber tow cable; the mother ship is used to connect the towing body through the umbilical cable and supply power to the towing body; the towing body is used to carry the seismic source, the strobe light, the ship automatic identification system and the cable winch.

[0013] The umbilical cable is mainly used to connect the mother ship and the entire towed body. Its length can be retracted and extended according to exploration needs. The inner core is composed of Kevlar rope as the central structure to provide tensile strength; there are multi-core optical fibers around it to provide seismic towed cable data transmission, and multi-core wires to power the seismic source / control the excitation and cable winch power supply / retraction and control, etc. The air pipe connects the air compressor of the mother ship and the seismic source on the towed body to supply air to the seismic source.

[0014] The towing body is the carrier of the entire collection system and has a ship-shaped structure.

[0015] The GI gun, which is commonly used in conventional seismic exploration, is used as the airgun source.

[0016] Distributed fiber optic streamers mainly use a new type of seismic signal receiving cable based on fiber optic technology. Compared with traditional cables, they have the characteristics of low cost, light weight, and thinner cable diameter. They are mainly composed of a leading section, a front shock-absorbing section, a seismic signal receiving cable, and a rear shock-absorbing section.

[0017] The automatic ship identification system is used to display ships whose distance from the towing body is less than a preset distance. The umbilical cable is used to exchange data with the towing body. The cable winch is used to retract and release the distributed optical fiber tow cable. The cable winch is mainly used to retract and release the distributed optical fiber tow cable. The umbilical cable is used to power and control the cable retraction and release. The strobe light is used for anti-collision warning during night operations.

[0018] The technical solution of the embodiment of the utility model discloses a seismic acquisition system, which can integrate the seismic source, distributed optical fiber towline and cable winch into a towed body, so as to realize modularization of the whole acquisition system and enable rapid deployment. It has the characteristics of integrated seismic detection and small portability, has low requirements on the acquisition mother ship carried, and can realize the characteristics of low acquisition cost and ultra-shallow operating water depth, etc.

Claims

1. A seismic acquisition system, characterized in that: At least including umbilical cables, automatic ship identification systems, strobe lights, seismic sources, cable winches, and distributed optical fiber streamers; Among them, the umbilical cable connects the acquisition mother ship and the towing body; the ship automatic identification system and the strobe light are installed above the towing body; the seismic source is installed below the towing body; the cable winch is used to be installed above the towing body; the cable winch is connected to the distributed optical fiber tow cable; the mother ship is used to connect the towing body through the umbilical cable and supply power to the towing body; the towing body is used to carry the seismic source, the strobe light, the ship automatic identification system and the cable winch.

2. The seismic acquisition system according to claim 1, characterized in that: The seismic source is an air gun seismic source.

3. The seismic acquisition system according to claim 1, characterized in that: The length of the umbilical cable is retracted or extended according to exploration demand information.

4. The seismic acquisition system according to claim 1, characterized in that: The ship automatic identification system is used to display ships whose distance from the towing body is less than a preset distance.

5. The seismic acquisition system according to claim 1, characterized in that: The umbilical cable is used to supply power to the towing body.

6. The seismic acquisition system according to claim 1, characterized in that: The umbilical cable is used for data exchange with the towing body.

7. The seismic acquisition system according to claim 1, characterized in that: The cable winch is used for retracting and releasing the distributed optical fiber streamer.

8. The seismic acquisition system according to claim 1, characterized in that: The cable winch is used to supply power to the distributed optical fiber streamer.

9. The seismic acquisition system according to claim 1, characterized in that: The strobe light is used for anti-collision warning during nighttime operation.

10. The seismic acquisition system according to claim 1, characterized in that: The distributed optical fiber streamer cable at least includes a leading section, a front shock absorbing section, a seismic signal receiving cable and a rear shock absorbing section.

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