Online Nuclear Magnetic Resonance Analysis of the Effect of Stress Changes on the Porosity and Permeability of Shale Oil Reservoirs

Lanlan Yao, Qihong Lei, Zhengming Yang (), Youan He, Haibo Li, Guoxi Zhao, Zigang Zheng, Haitao Hou, Meng Du and Liangbing Cheng
Additional contact information
Lanlan Yao: College of Engineering Science, University of Chinese Academy of Sciences, Beijing 101400, China
Qihong Lei: Shaanxi Yanchang Petroleum (China), Xi’an 710016, China
Zhengming Yang: Institute of Porous Flow and Fluid Mechanics, Langfang 065007, China
Youan He: Shaanxi Yanchang Petroleum (China), Xi’an 710016, China
Haibo Li: Institute of Porous Flow and Fluid Mechanics, Langfang 065007, China
Guoxi Zhao: Shaanxi Yanchang Petroleum (China), Xi’an 710016, China
Zigang Zheng: Shaanxi Yanchang Petroleum (China), Xi’an 710016, China
Haitao Hou: Institute of Porous Flow and Fluid Mechanics, Langfang 065007, China
Meng Du: College of Engineering Science, University of Chinese Academy of Sciences, Beijing 101400, China
Liangbing Cheng: Shaanxi Yanchang Petroleum (China), Xi’an 710016, China

Energies, 2023, vol. 16, issue 3, 1-17

Abstract: In the process of volumetric fracturing of shale oil, physical property changes caused by stress changes will affect the recovery, so it is urgent to conduct an analysis and evaluation of physical property changes caused by stress changes. In this research, a physical simulation experiment with constant confining pressure and variable pore pressure combined with an online nuclear magnetic resonance (NMR) technique was constructed. The results show that the increased range of the macropore (IRM) and the total pore (IRT) of matrix samples is 11.70~13.24% and 10.54~14.27% with the increase of pore pressure, respectively. That of fractured samples are 7.94~8.48% and 9.21~10.51%. It indicates that increasing pore pressure is more effective for matrix reservoirs. The decreased range of the macropore (DRM) and the total pore (DRT) of matrix samples is 10.29~13.89% and 10.38~21.24% with the unloading of pore pressure, respectively. That of fractured samples are 8.49~9.66% and 10.91~11.10%. It indicates that unloading pressure has less influence on fractured reservoirs. The increased range of permeability of matrix rock samples is 99~120% with the increase of pore pressure. Greatly supplementing formation energy is an effective means to improve the permeability of matrix reservoirs. Compared with matrix reservoirs, unloading pore pressure is more damaging to fractured reservoirs.

Keywords: shale oil; online NMR; pore pressure; porosity; permeability (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: 2023
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