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3D seismic and VSP on intervention fibre optic cables

Silixa’s fibre optic intervention-based DAS seismic services offer a fast, reliable and cost-effective way to acquiring high resolution borehole seismic.

Applications:

Reservoir imaging

Vertical Seismic Profiling (VSP)

Time-lapse monitoring, 4D VSP

Delivering real time imaging of the reservoir on single mode, multimode or Constellation™fibres enables efficient decision making and improves ultimate recovery.

Why use our distributed acoustic sensing-based seismic imaging services?

Our fiber intervention-based seismic services offer a rapid and cost-effective way of imaging the subsurface, delivering actionable insight into the reservoir.

The distributed nature of the measurement means that each point along the fibre is sampled simultaneously for each source initiation, dramatically reducing the operating time required for a conventional survey and significantly increasing the achievable wellbore coverage for moving source surveys.


Benefits

High resolution data enables cost-effective reservoir characterisation

  • Inherently reliable downhole sensor array
  • Low-cost approach to high volume seismic acquisition
  • Full wellbore coverage for every seismic shot
  • The highest spatial resolution and best sampling

More data in less time for actionable insight into the reservoir

The distributed nature of the measurement means that each point along the fibre is sampled simultaneously for each source initiation. This significantly reduces the operating time and increases the achievable wellbore coverage.


Data acquisition with a significantly smaller environmental footprint

Given the systems’ high sensitivity a much smaller source energy is required on site. This translates as faster results with smaller equipment footprint and reduced emissions.

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Reservoir imaging with intelligent Distributed Acoustic Sensor (iDAS™) and the Carina® Sensing System

Silixa’s iDAS and Carina Sensing System deliver the highest fidelity data with a significantly improved signal-to-noise ratio, hence providing complete clarity in reservoir imagining and characterization.

Using our proprietary SeiBer™ acquisition software, DAS interrogators can be used to trigger the source using a conventional controller, alternatively they can passively record the acoustic field continuously.

In passive mode, the DAS interrogator performs in a sample-perfect manner ensuring zero data loss during transitions. Multi-well acquisitions are made possible by synchronising multiple DAS systems.

Whether performing active or passive seismic acquisition, Silixa’s DAS seismic platforms can generate SEGY data files on site integrating well geometry, source navigation, and time information.


Reservoir imaging with the iDAS sensing system

Reservoir imaging with Carina Sensing System 

System performance

As a true acoustic sensor, the phase fidelity and linear amplitude response of the iDAS make it possible to process acquired data using conventional seismic techniques allowing for rapid and seamless integration of iDAS Seismic into existing acquisition strategies.By utilising Silixa’s new family of engineered Constellation™ fibres, incorporated within standard cables, the Carina® Sensing System can achieve up to 20dB (100x) improvement in signal to noise ratio over the already class-leading iDAS™ system.
This step-change in DAS performance enables our Carina Seismic service to offer unmatched insight into changes occurring within the reservoir, enabling rapid decisions to adjust well design and positioning, production, and injection rates to maximise recovery.

Well coverage

Full wellbore coverage in a single seismic shot.

Data quality

The quality and density of seismic data acquired with the iDAS rivals, and often exceed that of a conventional geophone acquisition.Carina Seismic offers performance beyond geophones and iDAS. With the combination of up to 20dB improvement in SNR, fine spatial sampling, and full wellbore coverage for every shot, it offers unprecedented detail in every shot record.

System adaptability

iDAS, when coupled to a single mode or multimode optical fibre, provides a versatile seismic acquisition platform capable of meeting many borehole seismic objectives.Carina can acquire seismic data when coupled with the singlemode fibre and Silixa’s proprietary Constellation fibre.

Operational efficiency

Reduced source effort or fewer shots, hence lowering the operation time and cost

Carbon footprint

For land surveys, an alternative continuous, less-disruptive energy source, the Surface Orbital Vibrator, is used, which generates zero-carbon emissions with minimised noise pollution.
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