Field trials of distributed acoustic sensing for geophysical monitoring

Mestayer, J. J.; Cox, Barbara; Wills, P.; Kiyashchenko, Denis; López, Jorge L.; Costello, Michael T.; Bourne, Stephen; Ugueto, Gustavo; Lupton, Robert H.; Solano, Giacomo; Hill, David J. T.; Lewis, Al

doi:10.1190/1.3628095

Cited by 153 publications

(88 citation statements)

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“…Distributed acoustic sensing (DAS) technology allows us to use in-well fiber optics for seismic measurements (see Mestayer et al, 2011;Mateeva et al, in this special section). Currently, VSP is the most mature seismic application of DAS.…”

Section: Das Field Trial Resultsmentioning

confidence: 99%

Steam-injection monitoring in South Oman—from single-pattern to field-scale surveillance

et al. 2013

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Downhole seismic monitoring has become an alternative to more conventional surface seismic in cases where the latter has low signal-to-noise ratio or poor repeatability, or when frequent monitoring of a local target is required. Downhole 3D VSP monitoring has been applied to both onshore (O'Brien et al., 2004; Kiyashchenko et al., 2011) and offshore environments (Wu et al., 2011). In onshore environments, surface seismic repeatability often suffers from surface noise and near-surface variations caused by water-table changes or surface facilities construction. For VSP surveys, the wavefield separation into downgoing and upgoing fields presents an opportunity to discriminate between near-surface and reservoir changes, thus making time-lapse applications more effective.

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Section: Das Field Trial Resultsmentioning

confidence: 99%

Steam-injection monitoring in South Oman—from single-pattern to field-scale surveillance

et al. 2013

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“…ISTRIBUTED fiber acoustic sensing technology based on Φ-OTDR has been researched extensively in recent years and has been widely used in the fields of oil and gas exploration, national defense, security and so on [1][2][3][4][5][6]. Φ-OTDR uses the highly coherent optical source to replace the broadband light source in the traditional OTDR, it's a kind of coherent OTDR technology.…”

Section: Introductionmentioning

confidence: 99%

Phase-Sensitive Optical Time Domain Reflectometer Based on Phase-Generated Carrier Algorithm

Fang

Feng

et al. 2015

J. Lightwave Technol.

172

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We propose a novel approach to generate distributed fiber sensing system based on phase-sensitive optical time domain reflectometer (Φ-OTDR) and phase generated carrier (PGC) demodulationalgorithm. An unbalanced Michelson interferometer is introduced at the receiving end of the system. The back Rayleigh scattering light from a certain position along the sensing fiber would interfere to generate interference light signal versus time, whose phase carries the sensing information. Phase generated carrier demodulation algorithm is proposed and carried out to recover the phase information. A single frequency vibration event is applied to a certain position along the sensing fiber and we realize to demodulate it correctly. The noise level of the phase sensitive OTDR system is about 3×10 -3 rad/√Hz and a signal to noise ratio about 30.45dB is achieved. The maximum sensing length and the spatial resolution of the Φ-OTDR system are 10km and 6m with pulse repetition rate at 10kHz and 6m fiber delay in MI with interrogating pulse width of 30ns.

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“…Distributed Acoustic Sensing (DAS) VSP is a new borehole seismic technology -Shell's first DAS field tests go back to 2009 -with a fiber optic cable used as a receiver of the acoustic energy in the well [7]. The fiber optic cable is attached to the wellbore and interrogated with laser pulses.…”

Section: Introductionmentioning

confidence: 99%

Distributed Acoustic Sensing (DAS) VSP for Imaging and Velocity Model Building

Nizkous¹,

Gerritsen²,

Kiyashchenko³

et al. 2015

Day 2 Mon, December 07, 2015

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Distributed Acoustic Sensing (DAS) deployed in multiple wells was used in Brunei for simultaneous recording of seismic signals emitted by a source grid on the surface. Such a configuration works similar to a 3D Vertical Seismic Profiling (VSP) survey with conventional geophones and provides interval velocities, time-depth relationship as well as images below the wells based on the reflected seismic rays. DAS VSP data has provided the opportunity of impacting asset performance by: (1) improving the image of the legacy 3D surface seismic by remigration using the updated shallow velocity model, thus minimizing both the structural as well as the depth uncertainty, and by (2) providing compelling DAS-only 2D and 3D images beneath the wells with higher resolution than the surface seismic. These can be employed for the reservoir static and dynamic model update and identification of sub-surface seismic faults and/or other events. Additionally, this technology presents the possibility of fluid monitoring in this type of reservoir where production is supported by water injection.

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Field trials of distributed acoustic sensing for geophysical monitoring

Cited by 153 publications

References 1 publication

Steam-injection monitoring in South Oman—from single-pattern to field-scale surveillance

Steam-injection monitoring in South Oman—from single-pattern to field-scale surveillance

Phase-Sensitive Optical Time Domain Reflectometer Based on Phase-Generated Carrier Algorithm

Distributed Acoustic Sensing (DAS) VSP for Imaging and Velocity Model Building

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