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Experimental Study on the Response Characteristics of the Apparent Resistivity of Rock True Triaxial Hydraulic Fracturing

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Abstract

To truly reflect changes in apparent resistivity before and after hydraulic fracturing (HF) of coal and rock masses in underground spaces, the fracturing effect should be investigated and evaluated. In this paper, experiments were conducted on true triaxial HF in rocks to investigate the apparent resistivity response law. The results show that the change in apparent resistivity was regular and uneven in the process of HF. The combined action of hydraulic cracks and fracturing water were the decisive factor in the apparent resistivity change. According to the time-sequence characteristics of apparent resistivity, the crack initiation sequence and spatial location can be reflected intuitively. The abrupt change and abnormal fluctuation in apparent resistivity near the cracks are important for crack initiation and propagation. Due to the difference in hydraulic crack shape and scope, the influence of cracks and fracturing water differs on different directions of rock. Therefore, the variation trend of apparent resistivity was different along various survey lines. After three-dimensional stress unloading, the water content in the cracks was affected by the crack opening, water storage space and drainage capacity, resulting in an obvious regional variation in apparent resistivity. The changes in apparent resistivity characteristics of true triaxial HF contain rich information about the fracture process, which is significant for guiding on-site HF and effect evaluation.

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Acknowledgments

We would like to thank the editor and anonymous reviewers for their constructive comments. We would like to thank Professor Bingxiang HUANG, Dr. Xinyu WANG and Dr. Weichen SUN from China University of Mining and Technology for their help in doing laboratory experiment. This work was supported by the National Natural Science Foundation of China (51874296, 52174221), The Natural Science Foundation of Jiangsu Province (BK20190080), the China Postdoctoral Science Foundation Grant (2018M640533).

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Correspondence to Nan Li.

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Li, N., Yan, M., Zhao, H. et al. Experimental Study on the Response Characteristics of the Apparent Resistivity of Rock True Triaxial Hydraulic Fracturing. Nat Resour Res 30, 4885–4904 (2021). https://doi.org/10.1007/s11053-021-09961-y

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  • DOI: https://doi.org/10.1007/s11053-021-09961-y

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