Microscopic occurrence characteristics and seepage law of water bodies in gas reservoir under stress: a case study of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

MA Yunfeng; ZHAO Jianguo; SUN Long; BAO Yuning; CAO Qingyun; GONG Xiaoke; CHEN Zhaobing; WANG Hengli

doi:10.11781/sysydz202303466

Volume 45 Issue 3

May 2023

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Article Navigation > PETROLEUM GEOLOGY & EXPERIMENT > 2023 > 45(3): 466-473

MA Yunfeng, ZHAO Jianguo, SUN Long, BAO Yuning, CAO Qingyun, GONG Xiaoke, CHEN Zhaobing, WANG Hengli. Microscopic occurrence characteristics and seepage law of water bodies in gas reservoir under stress: a case study of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(3): 466-473. doi: 10.11781/sysydz202303466

Citation:

MA Yunfeng, ZHAO Jianguo, SUN Long, BAO Yuning, CAO Qingyun, GONG Xiaoke, CHEN Zhaobing, WANG Hengli. Microscopic occurrence characteristics and seepage law of water bodies in gas reservoir under stress: a case study of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(3): 466-473. doi: 10.11781/sysydz202303466

Citation:

MA Yunfeng, ZHAO Jianguo, SUN Long, BAO Yuning, CAO Qingyun, GONG Xiaoke, CHEN Zhaobing, WANG Hengli. Microscopic occurrence characteristics and seepage law of water bodies in gas reservoir under stress: a case study of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(3): 466-473. doi: 10.11781/sysydz202303466

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Microscopic occurrence characteristics and seepage law of water bodies in gas reservoir under stress: a case study of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

doi: 10.11781/sysydz202303466

1.
Second Gas Production Plant, Changing Oilfield Company, PetroChina, Xi'an, Shaanxi 710200, China
2.
College of Earth Sciences & Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
3.
School of Petroleum Engineering and Environmental Engineering, Yan'an University, Yan'an, Shaanxi 716000, China

Received Date: 2022-10-26
Rev Recd Date: 2023-04-10
Publish Date: 2023-05-28

Abstract

Abstract

In order to solve the problem that the pore structure and the microscopic occurrence characteristics of fluid change with stress in real time during the depletion development of tight gas reservoirs, the pore structure, water production and irreducible water distribution characteristics of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin under different stress conditions were quantitatively characterized, and the influence of stress on gas-water relative permeability was analyzed by using nuclear magnetic resonance (NMR), high-pressure mercury injection (HPMI) and displacement experiments. The results show that when effective stress increases from 7 MPa to 17 MPa, reservoir porosity decreases from 8.39% to 7.65%, and the maximum pore radius decreases from 38.3 μm to 35.2 μm among which, the number of pore throats in the range of 0.3-18.9 μm decreases the most. The number of pores involved in seepage decreases due to the decrease of pore throat size, the bound water saturation increases from 51.3% to 59.7%, and the distribution range of the size of bound water increases from 0.012-17.4 μm to 0.012-20.1 μm. The changes of pore structure and bound water distribution characteristics further reduce the relative permeability of both gas and water phases, the relative permeability of gas phase decreases from 0.481 to 0.283, and that of isotonic point decreases from 0.157 to 0.09.
- tight gas reservoir,
- stress,
- pore structure,
- fluid distribution,
- percolation characteristics,
- Shenmu Gas Field,
- Ordos Basin

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Microscopic occurrence characteristics and seepage law of water bodies in gas reservoir under stress: a case study of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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Microscopic occurrence characteristics and seepage law of water bodies in gas reservoir under stress: a case study of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin

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