Time-lapse full-waveform inversion for cross-well monitoring of microbubble injection

Kamei, Rie; Jang, Ugeun; Lumley, David; Takanashi, Mamoru; Nakatsukasa, Masashi; Mouri, Takuji; Kato, Akira

doi:10.1190/segam2017-17673630.1

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…We attribute the largest V p reduction after fracture emplacement to the amount of gas bubbles (∼3%-4.5% gas saturation) accompany with the HRC injection. This V p reduction caused by gas bubbles is much more pronounced than less than 1% V p reduction by the microbubbles in the shallow sediments (Kamei et al, 2017).…”

Section: Discussionmentioning

confidence: 79%

“…We attribute the largest V p reduction after fracture emplacement to the amount of gas bubbles (∼3%–4.5% gas saturation) accompany with the HRC injection. This V p reduction caused by gas bubbles is much more pronounced than less than 1% V p reduction by the microbubbles in the shallow sediments (Kamei et al., 2017). In addition, our results show further V p reduction caused by exsolution gas bubbles from water pores within the fracture, which was not detected in the tomographic models.…”

Section: Discussionmentioning

confidence: 99%

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Understanding Subsurface Fracture Evolution Dynamics Using Time‐Lapse Full Waveform Inversion of Continuous Active‐Source Seismic Monitoring Data

Liu

Zhu

Ajo‐Franklin

2023

Geophysical Research Letters

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Predicting the behavior, geometry, and flow properties of subsurface fractures remains a challenging problem. Seismic models that can characterize fractures usually suffer from low spatiotemporal resolution. Here, we develop a correlative double‐difference time‐lapse full waveform inversion of continuous active source seismic monitoring data for determining high‐spatiotemporal‐resolution time‐lapse Vp models of in‐situ fracture evolution at a shallow contamination site in Wyoming, USA. Assisted by rock physics modeling, we find that (a) rapidly increasing pore pressure initializes and grows the fracture, increasing the porosity slightly (from ∼13.7% to ∼14.6%) in the tight clay formation, thus decreasing Vp (∼50 m/s); (b) the fluid injection continues decreasing Vp, likely through the introduction of gas bubbles in the injectate; and (c) final Vp reductions reach over ∼150 m/s due to a posited ∼4.5% gas saturation. Our results demonstrate that high‐resolution Vp changes are indicative of mechanical and fluid changes within the fracture zone during hydrofracturing.

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Understanding Subsurface Fracture Evolution Dynamics Using Time‐Lapse Full Waveform Inversion of Continuous Active‐Source Seismic Monitoring Data

Liu

Zhu

Ajo‐Franklin

2023

Geophysical Research Letters

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“…Borehole seismic measurements (VSP and crosswell seismics) provide more accurate, higher resolution images than surface seismic measurements due to the location of the receivers and/or sources close to the target and due to relatively lower sensitivity to near-surface heterogeneities. Time-lapse crosswell seismic traveltime tomography and waveform inversion have been used, for instance, to monitor changes in rock/soil-dynamic properties (e.g., Fehler and Pearson, 1984), to enable dynamic interpretation of shallow hydrosystems (e.g., Kamei et al, 2017), and to detect velocity changes due to CO2 injection (e.g., Saito et al, 2006;Luth et al, 2011;Ajo-Franklin et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Time-lapse target-oriented crosswell full-waveform inversion without downhole sources

Minato

Ghose

2021

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2021

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Time-lapse seismics has a wide range of application in different scales, from near-surface to resource exploration. Crosshole seismics is used to characterize fluid reservoirs and to obtain highly resolved rock/soil-dynamic parameters e.g., elastic moduli and Poisson ratio. Developments in distributed acoustic sensing shows the potential of deploying permanent downhole receivers at low costs. In order to achieve an efficient and accurate time-lapse seismic measurement in such scenarios, we have developed a nonlinear waveform inversion to reconstruct velocity structure between boreholes using VSP data with source located only at the surface, and no downhole sources. The new approach formulates the forward modelling using wavefield representation theorem, which enables directly estimating the velocity structure by minimizing data residuals and calculating the gradient from the adjoint state problem. We test the approach using numerical modelling of time-lapse VSP data to detect layer-specific temporal changes. A heterogeneous shallow vadose zone represents a low-velocity layer. The results show that the new approach provides more stable and more accurate temporal velocity profiles than conventional full waveform inversion, when the initial velocity model does not include the shallow low-velocity layer. The new approach is robust and highly advantageous as it does not require downhole seismic sources.

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“…Crosswell seismic measurements provide very high resolution images with high accuracy because both sources and receivers are installed in depth close to the target and seismic signals are less affected by near-surface heterogeneities. Time-lapse traveltime tomography and full waveform inversion (FWI) are, among others, applied to detect temporal changes of subsurface properties between boreholes (e.g., Saito et al, 2006;Luth et al, 2011;Ajo-Franklin et al, 2013;Kamei et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Crosswell Nonlinear Seismic Waveform Inversion Without Downhole Sources and its Application to Time-lapse Monitoring

Minato¹,

Ghose²

2019

Fifth EAGE Workshop on Borehole Geophysics

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Time-lapse full-waveform inversion for cross-well monitoring of microbubble injection

Cited by 10 publications

References 9 publications

Understanding Subsurface Fracture Evolution Dynamics Using Time‐Lapse Full Waveform Inversion of Continuous Active‐Source Seismic Monitoring Data

Understanding Subsurface Fracture Evolution Dynamics Using Time‐Lapse Full Waveform Inversion of Continuous Active‐Source Seismic Monitoring Data

Time-lapse target-oriented crosswell full-waveform inversion without downhole sources

Crosswell Nonlinear Seismic Waveform Inversion Without Downhole Sources and its Application to Time-lapse Monitoring

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