Application of Iterative Updating Geological Modeling Method in Geological Guidance of Shale Oil Horizontal Wells
In the Ordos basin Longdong area, the Chang 7 memeber of Yanchang formation is a typical interbedded shale oil reservoir with thin single oil layer, fast lateral and vertical changes, and strong heterogeneity. Currently, the prediction of inter well oil layer distribution characteristics is mainly b...
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Editorial Office of Well Logging Technology
2024-12-01
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| author | LI Zhihong LEI Qihong WU Yingzhang HE Youan CHENG Hao WANG Bo ZHOU Jingping ZHAO Yi |
| author_facet | LI Zhihong LEI Qihong WU Yingzhang HE Youan CHENG Hao WANG Bo ZHOU Jingping ZHAO Yi |
| author_sort | LI Zhihong |
| collection | DOAJ |
| description | In the Ordos basin Longdong area, the Chang 7 memeber of Yanchang formation is a typical interbedded shale oil reservoir with thin single oil layer, fast lateral and vertical changes, and strong heterogeneity. Currently, the prediction of inter well oil layer distribution characteristics is mainly based on two-dimensional geological sections and oil layer maps, which has low precision and leads to difficulties in geological guidance for horizontal wells, restricting the improvement of oil layer encounter rate. In order to further improve the oil layer encounter rate of shale oil horizontal wells, the method combines geological, logging, well-logging and 3D seismic data to select the optimal well-seismic integration modeling method, establishes a fine structural model, rock facies model and attribute model, and quantitatively represents the spatial distribution characteristics of shale oil drilling platform geological sweet spots in three-dimensional space. The gamma curve is optimized to establish a horizontal well geological guidance model, and the iterative geological modeling method is used to update the three-dimensional geological structure model and geological guidance model using the real-time logging and drilling data of the horizontal well, further improving the oil layer prediction accuracy and accurately predicting the distribution of drillhead front geological sweet spots in the horizontal well, guiding the efficient drilling of the horizontal well. Using this method, the geological guidance of HHX platform HHX-1 well is guided, and the measured oil layer encounter rate is 93.4% after drilling, which is significantly higher than the oil layer encounter rate of the adjacent well on the same platform. This shows that the iterative updating of geological modeling method can help improve the oil layer encounter rate of shale oil horizontal wells and has important guidance significance for the later stage geological guidance of Longdong shale oil. |
| format | Article |
| id | doaj-art-451a4b1cc15a48b8adad72b304e4e8cb |
| institution | DOAJ |
| issn | 1004-1338 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Editorial Office of Well Logging Technology |
| record_format | Article |
| series | Cejing jishu |
| spelling | doaj-art-451a4b1cc15a48b8adad72b304e4e8cb2025-08-20T03:08:18ZzhoEditorial Office of Well Logging TechnologyCejing jishu1004-13382024-12-0148683384110.16489/j.issn.1004-1338.2024.06.0121004-1338(2024)06-0833-09Application of Iterative Updating Geological Modeling Method in Geological Guidance of Shale Oil Horizontal WellsLI Zhihong0LEI Qihong1WU Yingzhang2HE Youan3CHENG Hao4WANG Bo5ZHOU Jingping6ZHAO Yi7Geological Research Institute, China National Logging Corporation, Xi'an, Shaanxi 710077, ChinaLongdong Oil & Gas Development Branch, PetroChina Changqing Oilfield Company, Qingyang, Gansu 745000, ChinaGeological Research Institute, China National Logging Corporation, Xi'an, Shaanxi 710077, ChinaExploration and Development Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, ChinaGeological Research Institute, China National Logging Corporation, Xi'an, Shaanxi 710077, ChinaExploration and Development Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, ChinaGeological Research Institute, China National Logging Corporation, Xi'an, Shaanxi 710077, ChinaGeological Research Institute, China National Logging Corporation, Xi'an, Shaanxi 710077, ChinaIn the Ordos basin Longdong area, the Chang 7 memeber of Yanchang formation is a typical interbedded shale oil reservoir with thin single oil layer, fast lateral and vertical changes, and strong heterogeneity. Currently, the prediction of inter well oil layer distribution characteristics is mainly based on two-dimensional geological sections and oil layer maps, which has low precision and leads to difficulties in geological guidance for horizontal wells, restricting the improvement of oil layer encounter rate. In order to further improve the oil layer encounter rate of shale oil horizontal wells, the method combines geological, logging, well-logging and 3D seismic data to select the optimal well-seismic integration modeling method, establishes a fine structural model, rock facies model and attribute model, and quantitatively represents the spatial distribution characteristics of shale oil drilling platform geological sweet spots in three-dimensional space. The gamma curve is optimized to establish a horizontal well geological guidance model, and the iterative geological modeling method is used to update the three-dimensional geological structure model and geological guidance model using the real-time logging and drilling data of the horizontal well, further improving the oil layer prediction accuracy and accurately predicting the distribution of drillhead front geological sweet spots in the horizontal well, guiding the efficient drilling of the horizontal well. Using this method, the geological guidance of HHX platform HHX-1 well is guided, and the measured oil layer encounter rate is 93.4% after drilling, which is significantly higher than the oil layer encounter rate of the adjacent well on the same platform. This shows that the iterative updating of geological modeling method can help improve the oil layer encounter rate of shale oil horizontal wells and has important guidance significance for the later stage geological guidance of Longdong shale oil.https://www.cnpcwlt.com/#/digest?ArticleID=5677shale oilhorizontal welliterative modeling methodnatural gamma modelgeosteeringordos basin |
| spellingShingle | LI Zhihong LEI Qihong WU Yingzhang HE Youan CHENG Hao WANG Bo ZHOU Jingping ZHAO Yi Application of Iterative Updating Geological Modeling Method in Geological Guidance of Shale Oil Horizontal Wells Cejing jishu shale oil horizontal well iterative modeling method natural gamma model geosteering ordos basin |
| title | Application of Iterative Updating Geological Modeling Method in Geological Guidance of Shale Oil Horizontal Wells |
| title_full | Application of Iterative Updating Geological Modeling Method in Geological Guidance of Shale Oil Horizontal Wells |
| title_fullStr | Application of Iterative Updating Geological Modeling Method in Geological Guidance of Shale Oil Horizontal Wells |
| title_full_unstemmed | Application of Iterative Updating Geological Modeling Method in Geological Guidance of Shale Oil Horizontal Wells |
| title_short | Application of Iterative Updating Geological Modeling Method in Geological Guidance of Shale Oil Horizontal Wells |
| title_sort | application of iterative updating geological modeling method in geological guidance of shale oil horizontal wells |
| topic | shale oil horizontal well iterative modeling method natural gamma model geosteering ordos basin |
| url | https://www.cnpcwlt.com/#/digest?ArticleID=5677 |
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