The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas Reservoirs
The uncertainties between reservoir quality and gas migration and accumulation in tight sandstone gas reservoirs are intrinsically attributed to complex microscopic pore structures. Integrated analysis including the physical simulation experiment of gas migration and accumulation, X-ray computed tom...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-10-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/12/21/4102 |
| _version_ | 1798005702125420544 |
|---|---|
| author | Juncheng Qiao Xianzheng Zhao Jianhui Zeng Guomeng Han Shu Jiang Sen Feng Xiao Feng |
| author_facet | Juncheng Qiao Xianzheng Zhao Jianhui Zeng Guomeng Han Shu Jiang Sen Feng Xiao Feng |
| author_sort | Juncheng Qiao |
| collection | DOAJ |
| description | The uncertainties between reservoir quality and gas migration and accumulation in tight sandstone gas reservoirs are intrinsically attributed to complex microscopic pore structures. Integrated analysis including the physical simulation experiment of gas migration and accumulation, X-ray computed tomography (X-CT), and casting thin section (CTS) were conducted on core plug samples collected from the Upper Paleozoic Permian Lower Shihezi and Shanxi tight sandstone of the Daniudi area in the Ordos Basin to investigate the impacts of pore structure on the gas migration and accumulation. Physical simulation suggested that the gas flows in migration in tight sandstone reservoirs were characterized by deviated-Darcy linear flow and non-linear flow regimes. Minimum and stable migration pressure square gradients determined by application of apparent permeability were employed as key parameters to describe gas flow. Pore structure characterization revealed that the tight sandstone reservoir was characterized by wide pore and throat size distributions and poor pore-throat connectivity. The pore−throat combinations could be divided into three types, including the macropore and coarse throat dominant reservoir, full-pore and full-throat form, and meso-small pore and fine throat dominant form. Comparative analyses indicated that pore and throat radii determined the gas flow regimes by controlling the minimum and stable migration pressure gradients. Gas accumulation capacity was dominated by the connected effective porosity, and the gas accumulation process was controlled by the cumulative effective porosity contribution from macropores to micropores. Variations in pore structures resulted in differences in gas migration and accumulation of tight sandstone reservoirs. The macropore and coarse throat-dominant and the full-pore and full-throat reservoirs exhibited greater gas migration and accumulation potentials than the small pore and fine throat dominate form. |
| first_indexed | 2024-04-11T12:44:32Z |
| format | Article |
| id | doaj.art-a8a164e99fc54614a6bfbcdba1c54ec2 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T12:44:32Z |
| publishDate | 2019-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-a8a164e99fc54614a6bfbcdba1c54ec22022-12-22T04:23:25ZengMDPI AGEnergies1996-10732019-10-011221410210.3390/en12214102en12214102The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas ReservoirsJuncheng Qiao0Xianzheng Zhao1Jianhui Zeng2Guomeng Han3Shu Jiang4Sen Feng5Xiao Feng6State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaDagang oil field company, Petrochina, Tianjin 300280, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaDagang oil field company, Petrochina, Tianjin 300280, ChinaEnergy & Geosciences Institute and Department of Chemical Engineering, University of Utah, Salt Lake City, UT 84108, USAState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaThe uncertainties between reservoir quality and gas migration and accumulation in tight sandstone gas reservoirs are intrinsically attributed to complex microscopic pore structures. Integrated analysis including the physical simulation experiment of gas migration and accumulation, X-ray computed tomography (X-CT), and casting thin section (CTS) were conducted on core plug samples collected from the Upper Paleozoic Permian Lower Shihezi and Shanxi tight sandstone of the Daniudi area in the Ordos Basin to investigate the impacts of pore structure on the gas migration and accumulation. Physical simulation suggested that the gas flows in migration in tight sandstone reservoirs were characterized by deviated-Darcy linear flow and non-linear flow regimes. Minimum and stable migration pressure square gradients determined by application of apparent permeability were employed as key parameters to describe gas flow. Pore structure characterization revealed that the tight sandstone reservoir was characterized by wide pore and throat size distributions and poor pore-throat connectivity. The pore−throat combinations could be divided into three types, including the macropore and coarse throat dominant reservoir, full-pore and full-throat form, and meso-small pore and fine throat dominant form. Comparative analyses indicated that pore and throat radii determined the gas flow regimes by controlling the minimum and stable migration pressure gradients. Gas accumulation capacity was dominated by the connected effective porosity, and the gas accumulation process was controlled by the cumulative effective porosity contribution from macropores to micropores. Variations in pore structures resulted in differences in gas migration and accumulation of tight sandstone reservoirs. The macropore and coarse throat-dominant and the full-pore and full-throat reservoirs exhibited greater gas migration and accumulation potentials than the small pore and fine throat dominate form.https://www.mdpi.com/1996-1073/12/21/4102tight gas sandstonepore structuregas migration and accumulationgas flow |
| spellingShingle | Juncheng Qiao Xianzheng Zhao Jianhui Zeng Guomeng Han Shu Jiang Sen Feng Xiao Feng The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas Reservoirs Energies tight gas sandstone pore structure gas migration and accumulation gas flow |
| title | The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas Reservoirs |
| title_full | The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas Reservoirs |
| title_fullStr | The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas Reservoirs |
| title_full_unstemmed | The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas Reservoirs |
| title_short | The Impacts of Nano-Micrometer Pore Structure on the Gas Migration and Accumulation in Tight Sandstone Gas Reservoirs |
| title_sort | impacts of nano micrometer pore structure on the gas migration and accumulation in tight sandstone gas reservoirs |
| topic | tight gas sandstone pore structure gas migration and accumulation gas flow |
| url | https://www.mdpi.com/1996-1073/12/21/4102 |
| work_keys_str_mv | AT junchengqiao theimpactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT xianzhengzhao theimpactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT jianhuizeng theimpactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT guomenghan theimpactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT shujiang theimpactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT senfeng theimpactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT xiaofeng theimpactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT junchengqiao impactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT xianzhengzhao impactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT jianhuizeng impactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT guomenghan impactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT shujiang impactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT senfeng impactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs AT xiaofeng impactsofnanomicrometerporestructureonthegasmigrationandaccumulationintightsandstonegasreservoirs |