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Technologies and techniques

Surveys with wide water-depth range

SCF GEO performs marine seismic 3D surveys in search for hydrocarbon fields in a wide variety of physical and geographical conditions in areas with water depth starting from 14 meters. 8-streamer vessel "Vyacheslav Tikhonov" is commonly used for shallow-water projects (with water depth of 14 to 50 meters) with equipment layout adjusted specifically for such depth range. Less separation between air-gun strings and streamers’ minimum offset give higher spatial resolution and better traceability of the target horizons at the top of the section.

14-streamer vessel “Ivan Gubkin” is used for carrying out deep-water projects (with water depth starting around 100 meters). The separation of the streamers reaching its maximum value allows shooting the maximum area in a short time. With the layout scheme of "Ivan Gubkin" the separation might be as wide as 200 m between the streamers, still supporting the FAN-mode option.


Examples of cubes obtained as a result of a conventional survey (on the left) and survey with BroadBand-BroadSource technology applied (right), performed by SCF GEO in 2016 over the same area.

BroadBand-BroadSource

SCF GEO applies the most advanced technologies for performing fieldwork with the best quality of the final seismic data. In 2016, a series of field tests were carried out to develop a technology for suppressing the energy of ghost waves - BroadBand-BroadSource. Unlike traditional (conventional) survey, in which the seismic streamer(s) and the line(s) of air guns are towed in a horizontal plane at constant depth, shooting as per BroadBand-BroadSource technology requires streamers and air guns be towed in a slant way (however with fixed geometry positioning of receivers and guns).

BroadBand-BroadSource technology allows to broadband spectrum of the recording data and obtain deghosted seismic signal.

Examples of cubes obtained as a result of a conventional survey (on the left) and survey with BroadBand-BroadSource technology applied (right), performed by SCF GEO in 2016 over the same area.

Triple Source


Example of 3D Survey with depth less than 14m. Turn limitations had to be implemented (3 x 3km @3 sec).

Another example of modern field technology used by SCF GEO is Triple Source when the research vessel tows three sets of air-gun strings working in so-called “flip-flop-flap” mode. It allows to reduce operation time of 3D seismic block up to 30% in comparison with traditional “flip-flop” dual source technology with same amount of streamers to reach higher performance at lower costs. Reduction of the survey time is especially important for areas with seasonal restrictions for seismic operations like ice, marine mammal migrations, weather conditions etc. In addition, triple source technology allows to increase streamer separation and so to reduce the risks of entanglement of outboard equipment.

Triple source creates more dense observing systems, which is very useful in the search for stratigraphic and lithological traps of hydrocarbons. To date, the technology of seismic data registration with 18.75m X 3.125m binning has been tested, tuned up and set up with eery aspect taking into account, starting from signature modeling and finishing by processing techniques for footprint removal.

24/7 QC

When it comes to data QC, SCF GEO provides an advanced option to its Clients - constant onshore/offshore “24/7” QC. Seismic vessels are equipped with the most advanced systems for seismic data processing. Quality control is carried out on three levels: ONLINE QC; OFFLINE QC and FAST-TRACK (onboard + onshore).

Fast Data Processing

SCF GEO in addition to QC and onboard FAST-TRACK offers subsequent seismic data processing by the complete graph (in onshore processing centers) with QC and preliminary QC interpretation under the FAST-TRACK stage. This significantly contributes to achieving the ultimate goal - obtaining a three-dimensional image of the studied structures and its geological interpretation.

Examples of time slice after PreSDM.

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