Fracture Identification Using Conventional Logs in Ultra-Low Permeability Sandstone Reservoirs: A Case Study of the Chang 6 Member of the Ordos Basin, China
The identification of reservoir fractures is essential as it is an important factor in the design of a field development plan, which in turn affects the efficiency of hydrocarbon production. Water flooding and water channeling are serious due to the lack of objective understanding of the fracture de...
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| Format: | Article |
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MDPI AG
2023-02-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/2/297 |
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| author | Shanbin He Kun Meng Ce Wang Yingbo Chen Hao Zhao Haoyuan Wang Hongyan Yu |
| author_facet | Shanbin He Kun Meng Ce Wang Yingbo Chen Hao Zhao Haoyuan Wang Hongyan Yu |
| author_sort | Shanbin He |
| collection | DOAJ |
| description | The identification of reservoir fractures is essential as it is an important factor in the design of a field development plan, which in turn affects the efficiency of hydrocarbon production. Water flooding and water channeling are serious due to the lack of objective understanding of the fracture development pattern in the tight oil reservoirs in the Triassic Change 6 member of Y well area, Ordos Basin, China. In this paper, we observed 104.6 m cores from 20 wells with a number of 150 fractures and an outcrop profile, then analyzed the main controlling factors for core fracture development, and finally established a fracture prediction method using conventional logging data. The results indicate that high-angle fractures accounted for 73.20%, fracture orientations were nearly east–west, fracture spacing between 0–10 cm accounted for 80.51%, fracture openings between 0–0.13 mm accounted for 89.27%, fracture down-cutting depths between 0–20 cm accounted for 80%, and 80.81% was not filled. In addition, we found that thin beds and fine sandstones are prone to develop fractures; Finally, our modified curve rate method was an effective method for fracture prediction. We conclude that fractures have the characteristics of high angle, small spacing, small opening, small down-cutting depth, and less filling. The modified curve change rate method is suitable for fracture prediction in tight sandstone reservoirs in the Triassic Change 6 member of the Y well area, Ordos Basin, China. |
| first_indexed | 2024-03-11T08:21:55Z |
| format | Article |
| id | doaj.art-2df2064e56254e4287beb264fd92a4e3 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T08:21:55Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-2df2064e56254e4287beb264fd92a4e32023-11-16T22:19:34ZengMDPI AGMinerals2075-163X2023-02-0113229710.3390/min13020297Fracture Identification Using Conventional Logs in Ultra-Low Permeability Sandstone Reservoirs: A Case Study of the Chang 6 Member of the Ordos Basin, ChinaShanbin He0Kun Meng1Ce Wang2Yingbo Chen3Hao Zhao4Haoyuan Wang5Hongyan Yu6Oilfield Department of Changqing Oilfield Company, Xi’an 710018, ChinaState Key Laboratory of Continental Dynamics and National, Department of Geology, Northwest University, Xi’an 710069, ChinaOilfield Department of Changqing Oilfield Company, Xi’an 710018, ChinaState Key Laboratory of Continental Dynamics and National, Department of Geology, Northwest University, Xi’an 710069, ChinaState Key Laboratory of Continental Dynamics and National, Department of Geology, Northwest University, Xi’an 710069, ChinaState Key Laboratory of Continental Dynamics and National, Department of Geology, Northwest University, Xi’an 710069, ChinaState Key Laboratory of Continental Dynamics and National, Department of Geology, Northwest University, Xi’an 710069, ChinaThe identification of reservoir fractures is essential as it is an important factor in the design of a field development plan, which in turn affects the efficiency of hydrocarbon production. Water flooding and water channeling are serious due to the lack of objective understanding of the fracture development pattern in the tight oil reservoirs in the Triassic Change 6 member of Y well area, Ordos Basin, China. In this paper, we observed 104.6 m cores from 20 wells with a number of 150 fractures and an outcrop profile, then analyzed the main controlling factors for core fracture development, and finally established a fracture prediction method using conventional logging data. The results indicate that high-angle fractures accounted for 73.20%, fracture orientations were nearly east–west, fracture spacing between 0–10 cm accounted for 80.51%, fracture openings between 0–0.13 mm accounted for 89.27%, fracture down-cutting depths between 0–20 cm accounted for 80%, and 80.81% was not filled. In addition, we found that thin beds and fine sandstones are prone to develop fractures; Finally, our modified curve rate method was an effective method for fracture prediction. We conclude that fractures have the characteristics of high angle, small spacing, small opening, small down-cutting depth, and less filling. The modified curve change rate method is suitable for fracture prediction in tight sandstone reservoirs in the Triassic Change 6 member of the Y well area, Ordos Basin, China.https://www.mdpi.com/2075-163X/13/2/297tight sandstone reservoirspaleomagnetic core orientationborehole electrical image logscurve change rate |
| spellingShingle | Shanbin He Kun Meng Ce Wang Yingbo Chen Hao Zhao Haoyuan Wang Hongyan Yu Fracture Identification Using Conventional Logs in Ultra-Low Permeability Sandstone Reservoirs: A Case Study of the Chang 6 Member of the Ordos Basin, China Minerals tight sandstone reservoirs paleomagnetic core orientation borehole electrical image logs curve change rate |
| title | Fracture Identification Using Conventional Logs in Ultra-Low Permeability Sandstone Reservoirs: A Case Study of the Chang 6 Member of the Ordos Basin, China |
| title_full | Fracture Identification Using Conventional Logs in Ultra-Low Permeability Sandstone Reservoirs: A Case Study of the Chang 6 Member of the Ordos Basin, China |
| title_fullStr | Fracture Identification Using Conventional Logs in Ultra-Low Permeability Sandstone Reservoirs: A Case Study of the Chang 6 Member of the Ordos Basin, China |
| title_full_unstemmed | Fracture Identification Using Conventional Logs in Ultra-Low Permeability Sandstone Reservoirs: A Case Study of the Chang 6 Member of the Ordos Basin, China |
| title_short | Fracture Identification Using Conventional Logs in Ultra-Low Permeability Sandstone Reservoirs: A Case Study of the Chang 6 Member of the Ordos Basin, China |
| title_sort | fracture identification using conventional logs in ultra low permeability sandstone reservoirs a case study of the chang 6 member of the ordos basin china |
| topic | tight sandstone reservoirs paleomagnetic core orientation borehole electrical image logs curve change rate |
| url | https://www.mdpi.com/2075-163X/13/2/297 |
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