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BOTTOM-CABLE SURVEYTECHNOLOGY

Positioning accuracy is determined with the aid of onboard special global positioning system DGPS and integral navigational system Trigger Fish. Independent bottom-cable positioning control is done by Sonardyne positioning system.

The XZone Marsh Line 2C (SI Technology, Russia) or SeaRay-100 / 4C (Sercel, France) systems are used to record data, each comprises onboard central recording system and a digital bottom-cable. In both systems receivers power supply and data exchange is performed across-the-wire from the onboard recorder.

In 2011 XZone system was thoroughly tested by VERIF-I (Great Britain). In bottom cables XZone Marsh Line various receiver modules aimed at recording of different components of wave field from 2C (hydrophone+geophone) to 4C (three-component XYZ geophone and hydrophone) can be used, the onshore component of the receiver unit FlyLander, which in any configuration can be connected with the offshore component of the system.

In SeaRay-100 bottom cable there are used 4C receiver modules, which include omnidirectional MEMS accelerometers+hydrophone, registration can also be done at the adjoining land.

2D2C and 2D4C OBC survey

OBC works are usually performed using conventional two-vessel or multi-vessel technology shooting along successively deployed CMP shooting lines.

Satellite navigation system is used to control shooting. CMP and recording system synchronization is provided via the radio channel.

As soon as each spread is shot the bottom-cable is towed to the profiled distance to provide the designed CMP fold of coverage.

As it is a cycled process, shooting is performed until full profiling is done.

3D2and 3D4C O survey.

3D operations are carried out by special paddle vehicles, three or four of which are used for the streamer deployment and its set-up, whereas one or two ones are used as elastic signal sources.

To excite oscillation special shallow-water mud-resistant source arrays Malysh (total volume of 490-800 inches3) are used.

The specially designed by Norwegian company PGS Exploration groups of air sources GGun, MiniGGun (total volume 600-1200 in 3) are used as sources of elastic signal in shallow water areas.

3D operations are performed by means of four or 4-8 deployed in parallel streamers 100-400 m apart from each other.

Deployment template is shot cross-line by one or two sources (flip-flop mode).

Quality Management and control

When shallow water acquisition is in process, party Chief (supplied with satellite phone), QC team and Supervisor shall be onboard the base vessel to support the field team. QC staff is equipped with development and QC systems: MESA professional, ProMax, SPW Field, Focus.
navigation
 

Streamer technology

OBC technology
CMP transition zone operations
Prospecting, QC, data acquisition and recording
Companys data library
Navigation Equipment

Relevant information
 
  1. The change of the owner was in June 5th, 2015.Geo Energy Group LLC being one of the major geological and geophysical holdings in Kazakhstan became 100% owner and the main partner of GGS-Khazar.In this regard the company was rebranded. For the present moment the full name of the company is a limited liability company Global Geophysical Services Khazar, abbreviated company name - in Russian and GGS-Khazar LLC in English. Please see the changes in Logo
  2. GGS-Khazar LLC is a legal successor of PGS-Khazar LLC and is liable for its debts and agreements. The previous resources as fleet, equipment, and personnel are kept the same. The vessels, hull and geophysical equipment have undergone regular preventive maintenance during out-of-season 2015-2016. The vessels have ship class survey with RMRS, amendments are made in ship documentation with regard to free navigation up to the spring 2017. The company is exploring its participation in different tenders from HRS and acoustic surveys to 3D4C acquisition.

The Company opportunities can be extended by attracting if necessary the parent company resources including onshore and offshore facilities.

GGS-Khazar LLC © 2016