Deep-Learning-Based Flow Prediction for CO 2 Storage in Shale–Sandstone Formations

Andrew K. Chu, Sally M. Benson and Gege Wen ()
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Andrew K. Chu: Department of Energy Resources Engineering, Stanford University, 367 Panama Street, Stanford, CA 94305, USA
Sally M. Benson: Department of Energy Resources Engineering, Stanford University, 367 Panama Street, Stanford, CA 94305, USA
Gege Wen: Department of Energy Resources Engineering, Stanford University, 367 Panama Street, Stanford, CA 94305, USA

Energies, 2022, vol. 16, issue 1, 1-21

Abstract: Carbon capture and storage (CCS) is an essential technology for achieving carbon neutrality. Depositional environments with sandstone and interbedded shale layers are promising for CO 2 storage because they can retain CO 2 beneath continuous and discontinuous shale layers. However, conventional numerical simulation of shale–sandstone systems is computationally challenging due to the large contrast in properties between the shale and sandstone layers and significant impact of thin shale layers on CO 2 migration. Extending recent advancements in Fourier neural operators (FNOs), we propose a new deep learning architecture, the RU-FNO, to predict CO 2 migration in complex shale–sandstone reservoirs under various reservoir conditions, injection designs, and rock properties. The gas saturation plume and pressure buildup predictions of the RU-FNO model are 8000-times faster than traditional numerical models and exhibit remarkable accuracy. We utilize the model’s fast prediction to investigate the impact of shale layer characteristics on plume migration and pressure buildup. These case studies show that shale–sandstone reservoirs with moderate heterogeneity and spatial continuity can minimize the plume footprint and maximize storage efficiency.

Keywords: carbon capture and storage; shale–sandstone reservoirs; deep learning; Fourier neural operator; convolutional neural network (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (1)

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