Seismic

Silixa’s ArraySeis™, our distributed fibre optic sensing-based seismic service, improves ultimate recovery and enables efficient decision making by providing high-resolution seismic data throughout the life of well. It does so on on both singlemode and multimode optical fibres with no loss of performance.

The intelligent Distributed Acoustic Sensor (iDAS™), when coupled to an optical fibre, provides a versatile seismic acquisition platform capable of meeting many borehole seismic objectives.

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.

Benefits

High resolution data enables cost-effective reservoir characterisation

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

Eliminate the cost of deferred production

When the optical fibre cable is permanently installed in the well, seismic acquisition can be performed without the need for well intervention and without stopping production, therefore offering significant savings to the operator and opening acquisition opportunities in existing wells otherwise not accessible to conventional borehole seismic techniques.


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.


Enables to utilise pre-existing singlemode and multimode fibres

Uniquely, iDAS can operate on both singlemode and multimode optical fibres with no loss of performance and without the need to introduce additional apparatus. The implications of this are that wells with installed multimode fibres for Distributed Temperature Sensing (DTS) become viable candidates for iDAS seismic surveys.


Permanent installation reduces OPEX across life of well

A permanently installed cable offers the ideal platform for time lapse seismic (4D VSP) where channel depths are consistent from survey to survey.

Permanently installed fibre optic cables can be utilised for additional applications as well, such as production monitoring, throughout the life of well.

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Improved image quality

The quality and density of seismic data acquired with the iDAS means that processed image quality can rival, and often exceed that of conventional geophone acquisition.

Silixa has built a track record of seismic acquisition in a diverse range of well types, installation methods, source conventions and survey designs and have co-authored, or featured in, a number of technical papers and articles on the subject.

Browse through our library of technical papers here.

Simglemode vs Multimode

Singlemode

Multimode

Efficient operations enabled by distributed acoustic sensing

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.
Using our SeiBer™ acquisition software, the iDAS can be used to trigger the source using a conventional controller, alternatively the iDAS can passively record the acoustic field continuously. In passive mode the iDAS performs in a sample-perfect manner ensuring that no samples are lost in the transition between data files and that zero-drift occurs relative to GPS time used to timestamp all data. Multi-well acquisition is made possible by synchronising multiple iDAS systems.

Whether triggered or in passive acquisition mode the iDAS seismic platform can generate SEGY data files in the field when geometry information and source navigation and timing information is made available.

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