Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin
By using core, logging curves, and experiment data, favorable lithofacies types in the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin were classified, standard of the favorable lithofacies was established, planar distribution regularities of the favorable lithofacies we...
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KeAi Communications Co., Ltd.
2020-12-01
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| Series: | Petroleum Exploration and Development |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380420601295 |
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| author | Junlong LIU Zhongqun LIU Kaihua XIAO Yanqing HUANG Wujun JIN |
| author_facet | Junlong LIU Zhongqun LIU Kaihua XIAO Yanqing HUANG Wujun JIN |
| author_sort | Junlong LIU |
| collection | DOAJ |
| description | By using core, logging curves, and experiment data, favorable lithofacies types in the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin were classified, standard of the favorable lithofacies was established, planar distribution regularities of the favorable lithofacies were identified, and forming mechanisms of the favorable lithofacies and their control effect on production were examined. (1) The 2nd Member of Xujiahe Formation has twelve types of lithofacies, among which multiple layer medium-coarse grain sandstone lithofacies, parallel bedding medium-coarse grain sandstone lithofacies, massive bedding medium-coarse grain sandstone lithofacies, inclined bedding medium-coarse grain sandstone lithofacies, and charcoal-bearing medium-coarse grain sandstone lithofacies with better physical properties and higher gas content are favorable lithofacies; they feature low gamma, low neutron porosity, low resistivity, and high acoustic travel time on logging curves. (2) The sedimentary process controls spatial distribution of sand bodies which are the material basis of the favorable lithofacies; post diagenetic fluids would differentially reconstruct the favorable lithofacies; tectonic activities and abnormal formation pressure made strata slide along the weakness plane, giving rise to fractures in different types of rocks, which can enhance the reservoir permeability significantly. (3) The development degree of favorable lithofacies is a major factor affecting stable production of gas well. |
| first_indexed | 2024-12-14T12:28:57Z |
| format | Article |
| id | doaj.art-bb20eb3fa88e4eaab21add940ecf0baf |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-12-14T12:28:57Z |
| publishDate | 2020-12-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Petroleum Exploration and Development |
| spelling | doaj.art-bb20eb3fa88e4eaab21add940ecf0baf2022-12-21T23:01:14ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042020-12-0147611941205Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan BasinJunlong LIU0Zhongqun LIU1Kaihua XIAO2Yanqing HUANG3Wujun JIN4Corresponding author; Sinopec Exploration & Production Research Institute, Beijing 100083, ChinaSinopec Exploration & Production Research Institute, Beijing 100083, ChinaSinopec Exploration & Production Research Institute, Beijing 100083, ChinaSinopec Exploration & Production Research Institute, Beijing 100083, ChinaSinopec Exploration & Production Research Institute, Beijing 100083, ChinaBy using core, logging curves, and experiment data, favorable lithofacies types in the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin were classified, standard of the favorable lithofacies was established, planar distribution regularities of the favorable lithofacies were identified, and forming mechanisms of the favorable lithofacies and their control effect on production were examined. (1) The 2nd Member of Xujiahe Formation has twelve types of lithofacies, among which multiple layer medium-coarse grain sandstone lithofacies, parallel bedding medium-coarse grain sandstone lithofacies, massive bedding medium-coarse grain sandstone lithofacies, inclined bedding medium-coarse grain sandstone lithofacies, and charcoal-bearing medium-coarse grain sandstone lithofacies with better physical properties and higher gas content are favorable lithofacies; they feature low gamma, low neutron porosity, low resistivity, and high acoustic travel time on logging curves. (2) The sedimentary process controls spatial distribution of sand bodies which are the material basis of the favorable lithofacies; post diagenetic fluids would differentially reconstruct the favorable lithofacies; tectonic activities and abnormal formation pressure made strata slide along the weakness plane, giving rise to fractures in different types of rocks, which can enhance the reservoir permeability significantly. (3) The development degree of favorable lithofacies is a major factor affecting stable production of gas well.http://www.sciencedirect.com/science/article/pii/S1876380420601295tight sandstone reservoirfavorable lithofaciesreservoir characterizationTriassic Xujiahe FormationXinchang areaSichuan Basin |
| spellingShingle | Junlong LIU Zhongqun LIU Kaihua XIAO Yanqing HUANG Wujun JIN Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin Petroleum Exploration and Development tight sandstone reservoir favorable lithofacies reservoir characterization Triassic Xujiahe Formation Xinchang area Sichuan Basin |
| title | Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin |
| title_full | Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin |
| title_fullStr | Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin |
| title_full_unstemmed | Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin |
| title_short | Characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation: A case study of the 2nd Member of Triassic Xujiahe Formation in the Xinchang area, Sichuan Basin |
| title_sort | characterization of favorable lithofacies in tight sandstone reservoirs and its significance for gas exploration and exploitation a case study of the 2nd member of triassic xujiahe formation in the xinchang area sichuan basin |
| topic | tight sandstone reservoir favorable lithofacies reservoir characterization Triassic Xujiahe Formation Xinchang area Sichuan Basin |
| url | http://www.sciencedirect.com/science/article/pii/S1876380420601295 |
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