Characterization of Nanoscale Pores in Tight Gas Sandstones Using Complex Techniques: A Case Study of a Linxing Tight Gas Sandstone Reservoir
Abstract
Pore structures with rich nanopores and permeability in tight gas reservoirs are poorly understood up to date. Advanced techniques are needed to be employed to accurately characterize pore structures, especially tiny pores which include micron and nanopores. In this study, various experimental techniques such as scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) , nitrogen adsorption method, and NMR cryoporometry (NMRC) are combined to interrogate the complex pore systems of the tight gas reservoir in the Linxing formation, Ordos Basin, China. Results show that tight gas sandstones are primarily comprised of residual interparticle and clay-dominated pores. Clay and quartz are two dominate minerals while pyrite occupies a nontrivial amount as well. The permeability of tight gas sandstones is very low, exhibiting an extremely poor positive correlation with porosity. While pore types and relative pore contents are more influential factors on the permeability, accurate characterization of pore size distribution is critical for the permeability of tight gas sandstones. Therefore, complementary characterization methods are carried out, indicating that neither small pores with (around peak 1 in NMR distribution) nor large pores with (around peak 3 in NMR distribution) control the permeability by analyzing the connectivity of the pores in various size ranges, but rather pores averaging approximately (around peak 2 in NMR distribution) have sufficient connectivity to host and transmit hydrocarbons. The pore size of tight gas sandstones is dominated by the clay-rich mineral assemblage. The study shows that the NMRC technique can be a very promising method, especially when referred to as a promising “roadmap” on how to interrogate tight formations such as the tight gas sands or even shale especially for the nanopore characterization.
- Authors:
-
- China University of Petroleum, Beijing, China, School of Earth Sciences, The Ohio State University, Columbus, Ohio, USA
- China University of Petroleum, Beijing, China
- School of Earth Sciences, The Ohio State University, Columbus, Ohio, USA
- Publication Date:
- Research Org.:
- The Ohio State University, Columbus, OH (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); Science Foundation of China University of Petroleum
- OSTI Identifier:
- 1837480
- Alternate Identifier(s):
- OSTI ID: 1980901
- Grant/Contract Number:
- SC0006878; 2462021XKBH007
- Resource Type:
- Published Article
- Journal Name:
- Geofluids
- Additional Journal Information:
- Journal Name: Geofluids Journal Volume: 2021; Journal ID: ISSN 1468-8115
- Publisher:
- Hindawi Publishing Corporation
- Country of Publication:
- Canada
- Language:
- English
- Subject:
- 15 GEOTHERMAL ENERGY
Citation Formats
Lyu, Chaohui, Zhong, Liguo, Ning, Zhengfu, Wang, Qing, Cole, David R., and Fattah, ed., Mohammed. Characterization of Nanoscale Pores in Tight Gas Sandstones Using Complex Techniques: A Case Study of a Linxing Tight Gas Sandstone Reservoir. Canada: N. p., 2021.
Web. doi:10.1155/2021/7670556.
Lyu, Chaohui, Zhong, Liguo, Ning, Zhengfu, Wang, Qing, Cole, David R., & Fattah, ed., Mohammed. Characterization of Nanoscale Pores in Tight Gas Sandstones Using Complex Techniques: A Case Study of a Linxing Tight Gas Sandstone Reservoir. Canada. https://doi.org/10.1155/2021/7670556
Lyu, Chaohui, Zhong, Liguo, Ning, Zhengfu, Wang, Qing, Cole, David R., and Fattah, ed., Mohammed. Mon .
"Characterization of Nanoscale Pores in Tight Gas Sandstones Using Complex Techniques: A Case Study of a Linxing Tight Gas Sandstone Reservoir". Canada. https://doi.org/10.1155/2021/7670556.
@article{osti_1837480,
title = {Characterization of Nanoscale Pores in Tight Gas Sandstones Using Complex Techniques: A Case Study of a Linxing Tight Gas Sandstone Reservoir},
author = {Lyu, Chaohui and Zhong, Liguo and Ning, Zhengfu and Wang, Qing and Cole, David R. and Fattah, ed., Mohammed},
abstractNote = {Pore structures with rich nanopores and permeability in tight gas reservoirs are poorly understood up to date. Advanced techniques are needed to be employed to accurately characterize pore structures, especially tiny pores which include micron and nanopores. In this study, various experimental techniques such as scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) T 2 , nitrogen adsorption method, and NMR cryoporometry (NMRC) are combined to interrogate the complex pore systems of the tight gas reservoir in the Linxing formation, Ordos Basin, China. Results show that tight gas sandstones are primarily comprised of residual interparticle and clay-dominated pores. Clay and quartz are two dominate minerals while pyrite occupies a nontrivial amount as well. The permeability of tight gas sandstones is very low, exhibiting an extremely poor positive correlation with porosity. While pore types and relative pore contents are more influential factors on the permeability, accurate characterization of pore size distribution is critical for the permeability of tight gas sandstones. Therefore, complementary characterization methods are carried out, indicating that neither small pores with radii < 100 nm (around peak 1 in NMR T 2 distribution) nor large pores with radii > 5 μ m (around peak 3 in NMR T 2 distribution) control the permeability by analyzing the connectivity of the pores in various size ranges, but rather pores averaging approximately 350 ± X nm (around peak 2 in NMR T 2 distribution) have sufficient connectivity to host and transmit hydrocarbons. The pore size of tight gas sandstones is dominated by the clay-rich mineral assemblage. The study shows that the NMRC technique can be a very promising method, especially when referred to as a promising “roadmap” on how to interrogate tight formations such as the tight gas sands or even shale especially for the nanopore characterization.},
doi = {10.1155/2021/7670556},
journal = {Geofluids},
number = ,
volume = 2021,
place = {Canada},
year = {Mon Dec 27 00:00:00 EST 2021},
month = {Mon Dec 27 00:00:00 EST 2021}
}
https://doi.org/10.1155/2021/7670556
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