Schlumberger

CLA Continuous Line Acquisition Method

Overview Library

Increasing seismic vessel efficiency by acquiring data while turning

Historically, marine seismic surveys did not record data during turns or line changes. This was related to a number of factors, including the ability to control the shape of the streamer spread throughout the turns and frequent downtime for source maintenance. This represents a missed opportunity to reduce NPT and record data in areas that are otherwise inaccessible.

Acquire data without interruption 

The CLA continuous line acquisition method allows continuous data acquisition without interruptions for line changes. This is enabled by active streamer steering, point-receiver sampling, and more reliable source systems. The CLA method is compatible with both Q-Marine point-receiver marine seismic system and IsoMetrix marine isometric seismic technology.

Eliminate time spent on line changes

Increased production efficiency means that a survey can be acquired in a significantly reduced time frame by eliminating the line change times. The shortened acquisition time reduces exposure to weather standby and technical downtime. The CLA method enables acquisition of seismic data in previously unobtainable areas adjacent to shallow water, reefs, oilfield obstructions, and national boundaries.

Account for azimuth variations during turns

The CLA method has benefited from fully integrated 3D data conditioning methods, including coordinate-driven noise attenuation, true-azimuth multiple attenuation, and velocity model building workflows that account for azimuth variations during the turns.

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