Improving Subsurface Images for Better Reservoir Management by CT-DAS-VSP in a Production Well Onshore Japan

Uematsu, Y.; Kobayashi, Yuki; Mochiji, S.; Xue, Ziqiu

doi:10.3997/2214-4609.2019x604030

Cited by 2 publications

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“…A recent study [ 70 ] shows that deploying fibers through a wireline in a vertical borehole can yield high-quality data given that the fiber tension is chosen to maximize SNR. Even in the challenging case of a fiber installed inside a flowing tubing [ 39 , 76 ], adequate data may be obtained after adequate processing.…”

Section: Vertical Seismic Profilingmentioning

confidence: 99%

Seismic Applications of Downhole DAS

Lellouch

Biondi

2021

Sensors

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Distributed Acoustic Sensing (DAS) is gaining vast popularity in the industrial and academic sectors for a variety of studies. Its spatial and temporal resolution is ever helpful, but one of the primary benefits of DAS is the ability to install fibers in boreholes and record seismic signals in depth. With minimal operational disruption, a continuous sampling along the trajectory of the borehole is made possible. Such resolution is highly challenging to obtain with conventional downhole tools. This review article summarizes different seismic uses, passive and active, of downhole DAS. We emphasize current DAS limitations and potential ways to overcome them.

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Section: Vertical Seismic Profilingmentioning

confidence: 99%

Seismic Applications of Downhole DAS

Lellouch

Biondi

2021

Sensors

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“…However, tube wave properties are predictable and have a much lower apparent velocity than the desired signal, and can thus be filtered out during processing. Acquisition using fibers deployed inside active wells is also possible, albeit significantly noisier (Kimura et al., 2019; Uematsu et al., 2019). The fibers can withstand harsh temperature and pressure conditions and can thus record close to or within the reservoir (Zhidong et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Low‐Magnitude Seismicity With a Downhole Distributed Acoustic Sensing Array—Examples From the FORGE Geothermal Experiment

et al. 2020

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We show the capabilities of a downhole distributed acoustic sensing (DAS) array in detecting, locating, and characterizing low‐magnitude earthquakes occurring in the vicinity of the Frontier Observatory for Research in Geothermal Energy (FORGE) site in Utah. Continuous data for 10.5 days were acquired in a monitoring well at the FORGE geothermal site during the initial stimulation of an enhanced geothermal system in April–May 2019. Earthquake activity beneath Mineral Mountains, Utah also occurred within 10 km of the FORGE monitoring well. During the experiment, four earthquakes were cataloged by routine processing of the University of Utah Seismograph Stations. Our processing of DAS data finds 77 earthquakes during that period, of which 16 are visible on the regional network. Five additional events are found by template matching DAS data. The magnitude of completeness obtained by DAS processing is better by at least M = 0.5 than the dense surface array around the FORGE site. Depth estimation using DAS is more reliable than using a surface array. While a single vertical DAS array is limited in terms of event location due to its azimuthal ambiguity, multiple DAS wells or a combination of a downhole array with surface stations or near‐surface horizontal DAS could jointly resolve locations. All detected events probably originated from the two active source areas, located 3–5 and 8–10 km away from the FORGE site, respectively. Recorded events can be reliably clustered into several distinct families thanks to the spatial density and large number of DAS channels.

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Improving Subsurface Images for Better Reservoir Management by CT-DAS-VSP in a Production Well Onshore Japan

Cited by 2 publications

References 0 publications

Seismic Applications of Downhole DAS

Seismic Applications of Downhole DAS

Low‐Magnitude Seismicity With a Downhole Distributed Acoustic Sensing Array—Examples From the FORGE Geothermal Experiment

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