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Shale 3D Reconstruction Method Based on Context-Aware Generative Adversarial Networks and High-Resolution Optical Flow Estimation

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
  • Published:
Chemistry and Technology of Fuels and Oils Aims and scope

Shale reservoirs are characterized by the presence of nano-micron pores in abundance, easy breakage due to bedding development, and difficulty in preparing true core samples. Therefore, 3D reconstruction of digital cores has become an important means of studying the microstructure features of shale. Currently, for shale matrix of dense reservoirs, existing deep learning-based reconstruction methods suffer from high costs and low accuracy, mainly due to the insufficient extraction capability of the networks for nano-micron pore features and low core resolution during reconstruction. To accurately predict the nano-micron scale pore structure of shale, we propose a shale 3D reconstruction method based on context-aware generative adversarial networks and high-resolution optical flow estimation (COFRnet-3DWGAN). This method optimizes the 3DWGAN(Wasserstein GAN) and high-resolution optical flow estimation networks by incorporating context-awareness, enhances the feature extraction capability of the networks to improve the learning degree of core nano-micron pores, and optimizes the core resolution by increasing the resolution of optical flow between core sequence images, thereby improving the accuracy of core reconstruction. The results show that, compared with WGAN, the proposed method is closer to the true core in terms of porous media morphological functions, porosity and permeability distribution, and pore structure parameters, indicating that this method has certain advantages in improving the accuracy of shale reconstruction.

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Acknowledgements

The authors cordially acknowledge the financial support of the National Natural Science Foundation of China (No.:51974270) and the Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance (No.:2020CX040201). The National Natural Science Foundation: The mechanism and method of reinforcing the reinforced body by plugging in shale water-based drilling fluid (No.:51974270). The Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance: Research on matching technology to reduce the complicated conditions and downhole accidents of long horizontal sections (No.:2020CX040201).

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Authors and Affiliations

  1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, SiChuan, China

    Wang Pingquan, Ran Chao, Su Junlin, Tang Tao, Fu Minhao & Xie Gang

  2. Petroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, DeYang, SiChuan, China

    Tang Tao

  3. Information Network Center, Department of Civil Affairs of Xinjiang Uygur Autonomous Region, Urumqi, XinJiang, China

    Rao Jiabao

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  1. Wang Pingquan
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  2. Ran Chao
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  3. Su Junlin
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  4. Tang Tao
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  5. Fu Minhao
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  6. Xie Gang
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  7. Rao Jiabao
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Correspondence to Ran Chao.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 83–92 May – June, 2023.

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Pingquan, W., Chao, R., Junlin, S. et al. Shale 3D Reconstruction Method Based on Context-Aware Generative Adversarial Networks and High-Resolution Optical Flow Estimation. Chem Technol Fuels Oils 59, 517–533 (2023). https://doi.org/10.1007/s10553-023-01553-1

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