“Haijing” System General Introduction
The "Haijing" system is the first complete set of marine towed streamer seismic exploration equipment independently developed by China, consisting of various equipment such as source control, towed streamer acquisition, intergrated navigation, and the towing streamer positioning and control. The "Haijing" system is a high-precision deepwater oil and gas seismic exploration data acquisition equipment with a new generation of solid cable architecture. It breaks through the technical limitations of imported equipment such as depth and channel spacing, with a maximum sinking depth of 100 meters and a minimum channel spacing of 3.125 meters. It has the characteristics of high-density acquisition, wide coverage and ultra long cable operation, and expands the low frequency to 2Hz, effectively improving the imaging effect of seismic data.
Haijing Streamer acquisition system
The streamer acquisition system independently developed by COSL, with complete independent intellectual property rights, supports the high-precision seismic data acquisition, transmission and recording, and meets the high-precision seismic exploration operations covering deep cable and inclined cable, filling the industrial gap in China. Besides, 22 national patents and 5 software copyrights have been granted.
· Polyurethane foam solid cable technology, with environmentally friendly, superior signal-to-noise ratio and low frequency, high durability and other features
· Solid detector technology, with strong resistance to the flow and vibration noise
· Phased array detector combination technology
· Complete control functions and real-time control, recording and playback of seismic data
· Remote power control and power protection
· Real-time system status monitoring
· Log record
· Tape, disk array, local hard disk, and mobile hard disk storage modes
Haijing Streamer control and positioning system
The marine seismic exploration streamer positioning and control system, independently developed by COSL, includes the water bird control system, compass bird, acoustic bird, horizontal bird and sonic bird systems. The system is used to control the depth and horizontal direction of the streamer, supporting the environmentally streamer course measurement, the acoustic measurement of underwater streamer, positioning and acoustic velocity measurement. Besides, 20 national patents and 6 software copyrights have been granted.
· Synchronization trigger accuracy: 0.1ms
· Communication mode and rate: FSK/2400bps
· Maximum nodes of a single cable: 40
· Compass bird course measurement accuracy: ±0.5°
· Compass bird depth measurement accuracy: 0.1m
· Acoustic bird ranging accuracy: 0.1ms
· Acoustic velocity measurement accuracy: 0.1m/s
Haijing Integrated navigation system
The integrated navigation system, independently developed by COSL, is the first set of systems for offshore streamer exploration with independent intellectual property rights in China. As the "brain" of the geophysical vessel, it can be used to coordinate the synchronous operation of the streamer acquisition, positioning and seismic source systems, and locate the seismic source and acquisition path, meeting the two-dimensional and three-dimensional conventional streamer operations. 11 national patents and 17 software copyrights have been granted.
· Compatible with Linux and Windows operating systems
· Conventional 2D and 3D streamer seismic exploration
· 3 firing modes of the ship reference point, source center point and common center point
· The maximum coordinate solution capability for 16 cables and 12-km length
Haijing Source control system
The air gun source control system, independently developed by COSL, includes the digital air gun source control system and analog air gun source control system. The system supports multiple sources, 16 arrays, 256 guns, with the synchronization control accuracy up to 0.05ms, the random, arbitrary array combination, delay and other control modes, and the far-field wavelet simulation. 7 national patents and 5 software copyrights have been granted.
· Maximum number of supported sources: 16
· Maximum number of guns supported: 256 (16 arrays x 16 guns)
· Synchronization control accuracy: 0.05ms
· Near-field record length: 16s@1ms
· Depth monitoring range: 0-30m
· Pressure monitoring range: 0-3,000psi
· Bolt, Sleeve and G guns supported
"Haimai" System General Introduction
"Haimai" is a self-developed core equipment for seismic exploration and acquisition of submarine nodes in China. Haimai has conquered technologies such as high sensitivity detectors and ultra-low noise acquisition circuits, greatly improving its ability to detect weak signals. It combines the comprehensive technical advantages of land exploration detectors and ocean hydrophones, with a collection ability four times that of conventional towing modes, and a 2-hertz ultra-low frequency sensing ability that reaches the highest level of similar products in the world. The first generation sea vein HQN500 is designed with a water depth of 500 meters, which has the characteristics of small volume, flexible deployment, and meets production requirements such as high-density, broadband, omnidirectional, large offset, and multi wave and multi-component seismic data acquisition.
Haimai Ocean Bottom Node- HQN500
HQN500 is a submarine seismic exploration node acquisition equipment independently developed by COSL. By making breakthroughs in key core technologies such as the ultra-low power circuit and ultra-low frequency detector, the equipment can be used for continuous seismic data acquisition operations, with the advantages of small size, flexible deployment, wide working water depth, good data acquisition quality, etc., satisfying the production requirements of high-density, broadband, all-round, cannon offset, multi-wave and multi-component seismic data acquisition. 2 national patents and 1 software copyrights have been granted.
· Number of channels: 4 (3-component geophone + hydrophone)
· Geophone: active force feedback moving-coil detector technology, 2Hz-200Hz
· Hydrophone: piezoelectric hydrophone, 2Hz-1,000Hz
· Operating depth: 500 m (Max. 700m)
· Continuous working hours: 60 days
· Clock accuracy: ≤2ms/30 days
· Sampling rate: 0.5/1/2/4ms
· Accuracy of tilt compass sensor: tilt angle ±1.5°, compass ±5°
· Operating temperature: -10°C-45°C
Haimai Acoustic transponder- HQN-MAPS100
HQN-MAPS Series cover the submarine seismic exploration acoustic positioning equipment independently developed by COSL, among them, HQN-MAPS 100 is a compatible transponder independently developed by COSL, which is perfectly compatible with OBC12 system, to locate submarine targets accurately and effectively.
The transponder is featured with the deep operating depth and low power consumption. Its shell is made of engineering plastic and the cylinder is made of titanium alloy, with high strength and corrosion resistance, strong reliability and the allowable pressure of no lower than 10Mpa.
· Transmitting source level: 184dB-187dB re 1uPa@1m;
· Receiving sensitivity: 105-112dB re 1uPa;
· Operating depth: 700m;
· Maximum number of nodes: 400;
· Working frequency range: 35-50kHz;
· Response channels: 10;
· Standby time: 24 months (12V alkaline battery);
· Mechanical material: engineering plastic and titanium alloy;
· Maximum operating pressure: 10Mpa;
Haimai OBC-HQC300
HQC300 OBC is a set of submarine seismic exploration and acquisition equipment independently developed by COSL. The equipment can be used for real-time monitoring while collecting the seismic data on the seabed in shallow offshore waters. The submarine cable has the advantages of less interference, stable position and low noise, and it is easy to eliminate the influence of ghost wave, broaden the frequency band and improve the data signal-to-noise ratio. The independent research and development of submarine cables is of great practical significance for breaking the monopoly of foreign technology and accelerating China's entry into the ranks of powerful countries in marine geophysical prospecting.
· Track pitch: 25m
· Length of working section: 275m/section
· System cabling capacity: 16 cables * 16km@2ms
· Operating depth: 300m;
· Number of channels: 4 (3-component geophone + hydrophone)
· Geophone: active force feedback moving-coil detector technology, 2Hz-200Hz
· Hydrophone: piezoelectric hydrophone, 2Hz-1,000Hz
· Sampling rate: 0.25ms, 0.5ms, 1ms, 2ms and 4ms
