Article
Geochemistry & Geophysics
Amir Mardan, Bernard Giroux, Gabriel Fabien-Ouellet
Summary: Seismic imaging has become the standard geophysical monitoring method for monitoring subsurface changes in applications such as carbon capture and storage and reservoir monitoring. However, the highly ill-posed problem of full-waveform inversion (FWI) can generate artifacts, making it challenging to discriminate true changes from noise. In this study, a weighted-average (WA) inversion method is proposed to control artifacts and differentiate them from true time-lapse changes, and synthetic tests on clean and noisy data show that WA provides the best compromise between accuracy and computation time.
Article
Geochemistry & Geophysics
Qi Hu, Dario Grana, Kristopher A. Innanen
Summary: This study proposes a full waveform inversion algorithm for predicting the spatial distribution of CO2 saturation from time-lapse seismic data. The method is tested on synthetic data and compared with conventional two-step inversion algorithms, demonstrating its robustness for reconstructing baseline and monitor models.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Rie Nakata, U-Geun Jang, David Lumley, Takuji Mouri, Masashi Nakatsukasa, Mamoru Takanashi, Ayato Kato
Summary: By utilizing innovative seismic monitoring techniques, we can effectively monitor the time-lapse changes in subsurface physical properties, which has significant applications in various fields.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Green & Sustainable Science & Technology
Stephen Harvey, Jonathan Hopkins, Henning Kuehl, Simon O'Brien, Albena Mateeva
Summary: The Quest Carbon Capture and Storage Facility in Canada began injecting CO2 in August 2015. A Measurement, Monitoring and Verification plan has been implemented to demonstrate containment and conformance of the injected CO2. Seismic methods are primarily used for monitoring the injected CO2 plume within the Geosphere domain.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Geochemistry & Geophysics
Shihao Yuan, Nobuaki Fuji, Satish C. Singh
Summary: Seismic full-waveform inversion is an effective method for estimating elastic properties of the subsurface. To address the computationally expensive issue of inverting high frequencies, a localized FWI algorithm has been developed, allowing for iterative modeling locally and reducing computation effort significantly, making it widely applicable in time-lapse seismic monitoring.
Article
Geochemistry & Geophysics
Xin Fu, Kristopher A. Innanen
Summary: Full-waveform inversion (FWI) methods provide high-resolution images of subsurface properties and have applications in 4D seismic inversion. The current strategies, including parallel strategy (PRS) and double-difference strategy (DDS), suffer from convergence differences and non-repeatable noise and geometries. This paper introduces stepsize-sharing PRS (SSPRS) and stepsize-sharing CMS as solutions to these problems. The comparisons show that SSPRS can adapt well to different scenarios and has a lower computational cost compared to other strategies.
Article
Geochemistry & Geophysics
Wei Zhou, David Lumley
Summary: This passage discusses the application of full-waveform inversion (FWI) in subsurface reservoir monitoring and the impact of nonrepeatability (NR) on the data and inversion results. It emphasizes the importance of addressing NR effects in order to accurately estimate changes in rock and fluid properties.
Article
Geochemistry & Geophysics
Wei Zhou, David Lumley
Summary: By adopting a new time-domain 2D acoustic time-lapse FWI method based on the central-difference scheme, high-resolution estimates of 4D velocity changes are obtained and rigorously tested on realistic data sets. The proposed method shows strong velocity increases in gas layers and weaker changes due to geomechanical effects, which are poorly recovered by conventional methods. In a realistic case study, the acoustic FWI method incorrectly fits some elastic scattered waves and struggles with strong elastic 4D coda waves, suggesting that the proposed central-difference 4D FWI method within the acoustic approximation may be a practical solution for time-lapse seismic velocity inversion.
Article
Green & Sustainable Science & Technology
Dong Li, Suping Peng, Xingguo Huang, Yinling Guo, Yongxu Lu, Xiaoqin Cui
Summary: The multi-scale time-lapse inversion method based on the curvelet transform offers an effective way to predict changes in reservoir elastic parameters without compromising calculation efficiency.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Geochemistry & Geophysics
Adrian Celaya, Bertrand Denel, Yen Sun, Mauricio Araya-Polo, Antony Price
Summary: This paper introduces two algorithms that can invert simulated gravity data to 3D subsurface rock/flow properties. The first algorithm is a data-driven, deep learning (DL)-based approach, while the second algorithm is also data-driven but considers the temporal evolution of surface gravity events. The target application of these algorithms is the prediction of subsurface CO2 plumes for monitoring CO2 sequestration deployments. Both algorithms outperform traditional inversion methods, producing high-resolution 3D subsurface reconstructions in near real-time. Additionally, the proposed methods achieve high scores for predicted plume geometry and data misfit, indicating the effectiveness of combining 4D surface gravity monitoring with DL techniques for monitoring CO2 storage sites.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Yanhua Liu, Ilya Tsvankin
Summary: Time-lapse full-waveform inversion is valuable for detecting changes in reservoir properties during hydrocarbon production and CO2 injection, but the accuracy of estimated source wavelets is often insufficient. This study incorporates a source-independent technique into the algorithm to improve the accuracy of estimating time-lapse changes.
Article
Geochemistry & Geophysics
Chao Huang, Tieyuan Zhu, Guangchi Xing
Summary: Continuous seismic monitoring is crucial for the security of long-term anthropogenic carbon dioxide geologic storage. A novel data-assimilated TLFWI method has been developed to accurately estimate time-lapse velocity and attenuation changes from dense monitoring data, improving the resolution and decreasing the model uncertainties. Numerical examples show the effectiveness and applicability of the method for tracking CO2 plumes and quantifying CO2 saturation.
Article
Green & Sustainable Science & Technology
Cesar Barajas-Olalde, Alan Mur, Donald C. Adams, Lu Jin, Jun He, John A. Hamling, Charles D. Gorecki
Summary: Time-lapse seismic monitoring is effective in mapping CO2 distribution in subsurface reservoirs. Analysis of amplitude differences can provide information on reservoir structure and CO2 migration. Joint inversion methods can be used for forecasting CO2 saturation and pressure changes.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Energy & Fuels
Xuejian Liu, Lianjie Huang, Kai Gao, Tom Bratton, George El-Kaseeh, William Ampomah, Robert Will, Paige Czoski, Martha Cather, Robert Balch, Brian McPherson
Summary: During the Development Phase, supercritical CO2 was injected into the Morrow B formation for Enhanced Oil Recovery (EOR) and carbon storage. Seismic datasets were acquired to characterize the subsurface structures, and vertical seismic profiling (VSP) data were acquired for monitoring CO2 injection and migration. Advanced inversion methods were applied to quantify spatiotemporal changes in velocity models and track the evolution of the CO2 plume.
Article
Geochemistry & Geophysics
Yan-Xiao He, ShangXu Wang, Chunhui Dong, Genyang Tang, Jialiang Zhang, Peidong Shi, Zhanxun Feng, Fengqi Zhang, Junzhou Liu, Guofa Li, Lei Shi
Summary: Using physical modelling experiments, we evaluate the impact of reservoir heterogeneities on seismic signatures and pore-fluid substitution on 4D seismic attributes. The experiments show that wave propagations in heterogeneous rocks lead to significantly magnified 4D attribute differences related to fluid replacements. Additionally, deformed waveform-induced seismic attribute anomalies may be beneficial for accurately identifying reservoir fluids and monitoring their minor variations.
GEOPHYSICAL PROSPECTING
(2023)