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Ultraviolet laser-induced lateral photovoltaic response in anisotropic black shale

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Abstract

The anisotropy of shale has significant impact on oil and gas exploration and engineering. In this paper, a-248 nm ultraviolet laser was employed to assess the anisotropic lateral photovoltaic (LPV) response of shale. Anisotropic angle-depending voltage signals were observed with different peak amplitudes (V p) and decay times. We employed exponential models to explain the charge carrier transport in horizontal and vertical directions. Dependences of the laser-induced LPV on the laser spot position were observed. Owing to the Dember effect and the layered structure of shale, V p shows an approximately linear dependence with the laser-irradiated position for the 0° shale sample but nonlinearity for the 45° and 90° ones. The results demonstrate that the laser-induced voltage method is very sensitive to the structure of materials, and thus has a great potential in oil and gas reservoir characterization.

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Acknowledgments

This work was supported by the National Nature Science Foundation of China (Grant No. 11574401) and the Science Foundation of China University of Petroleum, Beijing (No. 2462017YJRC029). The authors acknowledge Xing Fang for performing the SEM test shown in Fig. 1.

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Correspondence to Kun Zhao.

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Miao, X., Zhu, J., Zhao, K. et al. Ultraviolet laser-induced lateral photovoltaic response in anisotropic black shale. Appl. Phys. B 123, 276 (2017). https://doi.org/10.1007/s00340-017-6857-x

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  • DOI: https://doi.org/10.1007/s00340-017-6857-x

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