Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW China
The shale gas accumulation conditions in the basin-margin transition zone of southeastern Chongqing in SW China are complex. In order to improve single-well productivity in this area, the geologic characteristics, major factors controlling the occurrence of sweet spots, and drilling/fracturing optim...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2020-10-01
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| Series: | Energy Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666759220300421 |
| _version_ | 1818457828822614016 |
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| author | Xipeng He Peixian Zhang Guisong He Yuqiao Gao Ming Liu Yong Zhang Dazhi Fang Yanjing Li |
| author_facet | Xipeng He Peixian Zhang Guisong He Yuqiao Gao Ming Liu Yong Zhang Dazhi Fang Yanjing Li |
| author_sort | Xipeng He |
| collection | DOAJ |
| description | The shale gas accumulation conditions in the basin-margin transition zone of southeastern Chongqing in SW China are complex. In order to improve single-well productivity in this area, the geologic characteristics, major factors controlling the occurrence of sweet spots, and drilling/fracturing optimization were investigated in this study. The sweet spot evaluation system and criteria were established, and the horizontal-well-design technology was developed. The following three conclusions were drawn. First, the accumulation and high-productivity-oriented approaches for sweet spot evaluation are proposed and the criteria are established based on screened key indicators. Second, the horizontal well was designed based on: (1) the “six-map” method, to identify both the geology and engineering sweet spots for well locations; and (2)seismic attributes, to predict the development of fractures and cavities, and thus, avoid mud loss and improve the drilling efficiency. The target window, well-azimuth optimization, and the curvature were forecasted to improve the fracturing performances. Third, the Pingqiao anticline, Dongsheng anticline, Jinfo slope, and Wulong syncline were selected as Type I sweet spots. Currently, shale gas has been successfully discovered in the basin-margin transition zone and is being commercially developed. |
| first_indexed | 2024-12-14T22:48:46Z |
| format | Article |
| id | doaj.art-2f2fb6a6674e4d8a9278dacb3b65614e |
| institution | Directory Open Access Journal |
| issn | 2666-7592 |
| language | English |
| last_indexed | 2024-12-14T22:48:46Z |
| publishDate | 2020-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Energy Geoscience |
| spelling | doaj.art-2f2fb6a6674e4d8a9278dacb3b65614e2022-12-21T22:44:46ZengKeAi Communications Co., Ltd.Energy Geoscience2666-75922020-10-0113134146Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW ChinaXipeng He0Peixian Zhang1Guisong He2Yuqiao Gao3Ming Liu4Yong Zhang5Dazhi Fang6Yanjing Li7Corresponding author.; Research Institute of Exploration and Development, Sinopec East China Company, Nanjing, Jiangsu, 210011, ChinaResearch Institute of Exploration and Development, Sinopec East China Company, Nanjing, Jiangsu, 210011, ChinaResearch Institute of Exploration and Development, Sinopec East China Company, Nanjing, Jiangsu, 210011, ChinaResearch Institute of Exploration and Development, Sinopec East China Company, Nanjing, Jiangsu, 210011, ChinaResearch Institute of Exploration and Development, Sinopec East China Company, Nanjing, Jiangsu, 210011, ChinaResearch Institute of Exploration and Development, Sinopec East China Company, Nanjing, Jiangsu, 210011, ChinaResearch Institute of Exploration and Development, Sinopec East China Company, Nanjing, Jiangsu, 210011, ChinaResearch Institute of Exploration and Development, Sinopec East China Company, Nanjing, Jiangsu, 210011, ChinaThe shale gas accumulation conditions in the basin-margin transition zone of southeastern Chongqing in SW China are complex. In order to improve single-well productivity in this area, the geologic characteristics, major factors controlling the occurrence of sweet spots, and drilling/fracturing optimization were investigated in this study. The sweet spot evaluation system and criteria were established, and the horizontal-well-design technology was developed. The following three conclusions were drawn. First, the accumulation and high-productivity-oriented approaches for sweet spot evaluation are proposed and the criteria are established based on screened key indicators. Second, the horizontal well was designed based on: (1) the “six-map” method, to identify both the geology and engineering sweet spots for well locations; and (2)seismic attributes, to predict the development of fractures and cavities, and thus, avoid mud loss and improve the drilling efficiency. The target window, well-azimuth optimization, and the curvature were forecasted to improve the fracturing performances. Third, the Pingqiao anticline, Dongsheng anticline, Jinfo slope, and Wulong syncline were selected as Type I sweet spots. Currently, shale gas has been successfully discovered in the basin-margin transition zone and is being commercially developed.http://www.sciencedirect.com/science/article/pii/S2666759220300421Normal-pressure shale gasEvaluation of sweet spotsHorizontal well designWufeng–longmaxiSoutheastern Chongqing |
| spellingShingle | Xipeng He Peixian Zhang Guisong He Yuqiao Gao Ming Liu Yong Zhang Dazhi Fang Yanjing Li Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW China Energy Geoscience Normal-pressure shale gas Evaluation of sweet spots Horizontal well design Wufeng–longmaxi Southeastern Chongqing |
| title | Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW China |
| title_full | Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW China |
| title_fullStr | Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW China |
| title_full_unstemmed | Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW China |
| title_short | Evaluation of sweet spots and horizontal-well-design technology for shale gas in the basin-margin transition zone of southeastern Chongqing, SW China |
| title_sort | evaluation of sweet spots and horizontal well design technology for shale gas in the basin margin transition zone of southeastern chongqing sw china |
| topic | Normal-pressure shale gas Evaluation of sweet spots Horizontal well design Wufeng–longmaxi Southeastern Chongqing |
| url | http://www.sciencedirect.com/science/article/pii/S2666759220300421 |
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