Integrated Diagenesis Study of Tight Gas Sandstone: The Permian Lower Shihezi Formation, Northern Ordos Basin, China
AbstractDiagenesis varies greatly from basin to basin and has been considered as the key control of the reservoir quality of tight sandstones. In this study, we analyzed the petrographic characteristics, diagenesis, and pore types and characteristics of the Permian Lower Shihezi Form...
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GeoScienceWorld
2022-07-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/1/7760591/615595/Integrated-Diagenesis-Study-of-Tight-Gas-Sandstone |
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| author | Qinghai Xu Xiangyang Xie Changmin Zhang Lianfu Hai Arthur Busbey |
| author_facet | Qinghai Xu Xiangyang Xie Changmin Zhang Lianfu Hai Arthur Busbey |
| author_sort | Qinghai Xu |
| collection | DOAJ |
| description |
AbstractDiagenesis varies greatly from basin to basin and has been considered as the key control of the reservoir quality of tight sandstones. In this study, we analyzed the petrographic characteristics, diagenesis, and pore types and characteristics of the Permian Lower Shihezi Formation in the Ordos Basin. Results show that most of sandstones are litharenites with minor sublitharenites and feldspathic litharenites. The tight sandstones have ultralow permeabilities (averaging 0.67 mD) and porosities (averaging 8.35%), with pore-throat sizes ranging from 0.035 to 13.29 μm with 94.12% less than 5 μm. Overall, the tight sandstone reservoirs have undergone complex diagenetic alteration. Compaction and clay mineral cements are the two crucial diagenetic factors that controlled the tightness of the reservoirs. The compaction destroyed most of primary porosity, and the effective pores are mainly dissolved micropores, intragranular dissolved micropores, and micropores in clay minerals and mineral grains. The chlorite coating might have helped preserve a certain amount of porosity, but pore-lining chlorites significantly obstructed pore throats and reduced permeability. Results of the study provide insights and direct implications for the future success of exploration and production of the tight gas sandstone in the Ordos Basin and other similar tight sandstone reservoirs. |
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| format | Article |
| id | doaj.art-99be16fc96e240ca90baa230dba4e1f4 |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-13T05:38:39Z |
| publishDate | 2022-07-01 |
| publisher | GeoScienceWorld |
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| series | Lithosphere |
| spelling | doaj.art-99be16fc96e240ca90baa230dba4e1f42022-12-22T03:00:11ZengGeoScienceWorldLithosphere1941-82641947-42532022-07-012022110.2113/2022/7760591Integrated Diagenesis Study of Tight Gas Sandstone: The Permian Lower Shihezi Formation, Northern Ordos Basin, ChinaQinghai Xu0http://orcid.org/0000-0003-4769-6052Xiangyang Xie1http://orcid.org/0000-0001-9226-5927Changmin Zhang2Lianfu Hai3Arthur Busbey41 School of Earth Science Yangtze University Wuhan 430100 China yangtzeu.edu.cn2 Department of Geological Sciences Texas Christian University Fort Worth TX 76129 USA tcu.edu1 School of Earth Science Yangtze University Wuhan 430100 China yangtzeu.edu.cn3 Mineral Geological Survey Institute of Ningxia Hui Autonomous Region Yinchuan 750021 China2 Department of Geological Sciences Texas Christian University Fort Worth TX 76129 USA tcu.edu AbstractDiagenesis varies greatly from basin to basin and has been considered as the key control of the reservoir quality of tight sandstones. In this study, we analyzed the petrographic characteristics, diagenesis, and pore types and characteristics of the Permian Lower Shihezi Formation in the Ordos Basin. Results show that most of sandstones are litharenites with minor sublitharenites and feldspathic litharenites. The tight sandstones have ultralow permeabilities (averaging 0.67 mD) and porosities (averaging 8.35%), with pore-throat sizes ranging from 0.035 to 13.29 μm with 94.12% less than 5 μm. Overall, the tight sandstone reservoirs have undergone complex diagenetic alteration. Compaction and clay mineral cements are the two crucial diagenetic factors that controlled the tightness of the reservoirs. The compaction destroyed most of primary porosity, and the effective pores are mainly dissolved micropores, intragranular dissolved micropores, and micropores in clay minerals and mineral grains. The chlorite coating might have helped preserve a certain amount of porosity, but pore-lining chlorites significantly obstructed pore throats and reduced permeability. Results of the study provide insights and direct implications for the future success of exploration and production of the tight gas sandstone in the Ordos Basin and other similar tight sandstone reservoirs.https://pubs.geoscienceworld.org/lithosphere/article/2022/1/7760591/615595/Integrated-Diagenesis-Study-of-Tight-Gas-Sandstone |
| spellingShingle | Qinghai Xu Xiangyang Xie Changmin Zhang Lianfu Hai Arthur Busbey Integrated Diagenesis Study of Tight Gas Sandstone: The Permian Lower Shihezi Formation, Northern Ordos Basin, China Lithosphere |
| title | Integrated Diagenesis Study of Tight Gas Sandstone: The Permian Lower Shihezi Formation, Northern Ordos Basin, China |
| title_full | Integrated Diagenesis Study of Tight Gas Sandstone: The Permian Lower Shihezi Formation, Northern Ordos Basin, China |
| title_fullStr | Integrated Diagenesis Study of Tight Gas Sandstone: The Permian Lower Shihezi Formation, Northern Ordos Basin, China |
| title_full_unstemmed | Integrated Diagenesis Study of Tight Gas Sandstone: The Permian Lower Shihezi Formation, Northern Ordos Basin, China |
| title_short | Integrated Diagenesis Study of Tight Gas Sandstone: The Permian Lower Shihezi Formation, Northern Ordos Basin, China |
| title_sort | integrated diagenesis study of tight gas sandstone the permian lower shihezi formation northern ordos basin china |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/1/7760591/615595/Integrated-Diagenesis-Study-of-Tight-Gas-Sandstone |
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