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Numerical Investigations of NMR T1–T2 Map in Two-Phase Fluid-Bearing Tight Sandstone

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Abstract

Study of two-dimensional nuclear magnetic resonance (NMR) longitudinal and transverse relaxation time (T1–T2) responses of tight reservoirs and optimization of T1–T2 acquisition parameter are of significance for exploration and development of tight oil and gas reservoirs. In this paper, a tight sandstone digital model was generated using a micro-CT scanning technique, and the random-walk method was modified to simulate the T1–T2 measurements in a two-phase fluid-bearing tight sandstone. The echo data of the saturation-recovery Carr–Purcell–Meiboom–Gill pulse sequence were acquired and processed to obtain a T1–T2 map. We compared oil–water-bearing tight sandstone T1–T2 maps with gas–water-bearing tight sandstone T1–T2 maps, and analyzed how fluid types, various degrees of fluid saturation, acquisition parameters, and signal-to-noise ratio (SNR) of NMR data affected T1–T2 maps. The research indicated that NMR T1–T2 logging is more suitable for identifying gas-bearing reservoirs, rather than oil-bearing reservoirs. NMR-logging acquisition parameters have different influences on various fluid-bearing tight sandstone T1–T2 maps. Increasing either the magnetic field gradient or echo spacing leads to a leftward shift of the gas signal, but does not affect the water signal and the oil signal in a T1–T2 map; the T1–T2 map with a mixed group of wait time is better than that with a long or short group of wait time in providing fluid relaxation information. The NMR data with lower SNR result in stronger divergence of fluid signal in T1–T2 map, rendering it more difficult to identify the fluid according to the map, and a data SNR more than 21 is recommended.

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Acknowledgements

This project was funded by the National Natural Science Foundation of China (41674126). We thank the editors and reviewers for their constructive comments and suggestions.

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Authors and Affiliations

  1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China

    Jiangfeng Guo & Ranhong Xie

  2. Key Laboratory of Earth Prospecting and Information Technology, China University of Petroleum (Beijing), Beijing, 102249, China

    Jiangfeng Guo & Ranhong Xie

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  1. Jiangfeng Guo
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  2. Ranhong Xie
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Correspondence to Ranhong Xie.

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Guo, J., Xie, R. Numerical Investigations of NMR T1–T2 Map in Two-Phase Fluid-Bearing Tight Sandstone. Appl Magn Reson 50, 479–495 (2019). https://doi.org/10.1007/s00723-018-1098-7

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  • DOI: https://doi.org/10.1007/s00723-018-1098-7

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