The Distribution Characteristics and Genesis Analysis of Overpressure in the Qiongzhusi Formation in the Zizhong Area, Sichuan Basin
Accurately predicting the genesis and distribution of reservoir pressure is essential for comprehending the distribution of oil and gas reservoirs while mitigating drilling risks. In the Qiongzhusi Formation of the Sichuan Basin, overpressure has developed, leading to high production levels in sever...
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MDPI AG
2025-03-01
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| author | Xuewen Shi Yuran Yang Qiuzi Wu Yanyou Li Yifan He He Tian Zhenxue Jiang Zhongyu Bi Huan Miao |
| author_facet | Xuewen Shi Yuran Yang Qiuzi Wu Yanyou Li Yifan He He Tian Zhenxue Jiang Zhongyu Bi Huan Miao |
| author_sort | Xuewen Shi |
| collection | DOAJ |
| description | Accurately predicting the genesis and distribution of reservoir pressure is essential for comprehending the distribution of oil and gas reservoirs while mitigating drilling risks. In the Qiongzhusi Formation of the Sichuan Basin, overpressure has developed, leading to high production levels in several wells. However, the distribution and causal mechanism of overpressure within the Qiongzhusi Formation remain unclear at present. This study utilizes logging data from representative drilling wells to identify the causes of overpressure in the Qiongzhusi Formation and predict the characteristics of pressure distribution. The results indicate that the pressure coefficient of the Qiongzhusi Formation ranges from 1.01 to 2.05 and increases with burial depth. The overpressure in the Qiongzhusi Formation is attributed to fluid expansion, disequilibrium compaction, and pressure transmission. The contribution of disequilibrium compaction to pressure is 9.44 MPa, while hydrocarbon generation from organic matter contributes 82.66 MPa, and pressure transmission contributes 37.98 MPa. Additionally, the uplift erosion unloading effect and geothermal decline result in pressure reductions of approximately 26.68 MPa and 56.56 MPa, respectively. This study systematically elucidates the causes and distribution of overpressure in the Qiongzhusi Formation, providing valuable insights for subsequent exploration and development of shale gas in this formation. |
| format | Article |
| id | doaj-art-0118272c1ca84101bdb78b6bafca93fc |
| institution | DOAJ |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-0118272c1ca84101bdb78b6bafca93fc2025-08-20T02:42:35ZengMDPI AGApplied Sciences2076-34172025-03-01156288810.3390/app15062888The Distribution Characteristics and Genesis Analysis of Overpressure in the Qiongzhusi Formation in the Zizhong Area, Sichuan BasinXuewen Shi0Yuran Yang1Qiuzi Wu2Yanyou Li3Yifan He4He Tian5Zhenxue Jiang6Zhongyu Bi7Huan Miao8Shale Gas Research Institution, PetroChina Southwest Oil & Gas Field Co., Chengdu 610051, ChinaShale Gas Research Institution, PetroChina Southwest Oil & Gas Field Co., Chengdu 610051, ChinaShale Gas Research Institution, PetroChina Southwest Oil & Gas Field Co., Chengdu 610051, ChinaShale Gas Research Institution, PetroChina Southwest Oil & Gas Field Co., Chengdu 610051, ChinaShale Gas Research Institution, PetroChina Southwest Oil & Gas Field Co., Chengdu 610051, ChinaShale Gas Research Institution, PetroChina Southwest Oil & Gas Field Co., Chengdu 610051, ChinaNational Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, ChinaNational Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, ChinaNational Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, ChinaAccurately predicting the genesis and distribution of reservoir pressure is essential for comprehending the distribution of oil and gas reservoirs while mitigating drilling risks. In the Qiongzhusi Formation of the Sichuan Basin, overpressure has developed, leading to high production levels in several wells. However, the distribution and causal mechanism of overpressure within the Qiongzhusi Formation remain unclear at present. This study utilizes logging data from representative drilling wells to identify the causes of overpressure in the Qiongzhusi Formation and predict the characteristics of pressure distribution. The results indicate that the pressure coefficient of the Qiongzhusi Formation ranges from 1.01 to 2.05 and increases with burial depth. The overpressure in the Qiongzhusi Formation is attributed to fluid expansion, disequilibrium compaction, and pressure transmission. The contribution of disequilibrium compaction to pressure is 9.44 MPa, while hydrocarbon generation from organic matter contributes 82.66 MPa, and pressure transmission contributes 37.98 MPa. Additionally, the uplift erosion unloading effect and geothermal decline result in pressure reductions of approximately 26.68 MPa and 56.56 MPa, respectively. This study systematically elucidates the causes and distribution of overpressure in the Qiongzhusi Formation, providing valuable insights for subsequent exploration and development of shale gas in this formation.https://www.mdpi.com/2076-3417/15/6/2888Sichuan BasinQiongzhusi Formationshale gasfluid pressuregenesis of overpressure |
| spellingShingle | Xuewen Shi Yuran Yang Qiuzi Wu Yanyou Li Yifan He He Tian Zhenxue Jiang Zhongyu Bi Huan Miao The Distribution Characteristics and Genesis Analysis of Overpressure in the Qiongzhusi Formation in the Zizhong Area, Sichuan Basin Applied Sciences Sichuan Basin Qiongzhusi Formation shale gas fluid pressure genesis of overpressure |
| title | The Distribution Characteristics and Genesis Analysis of Overpressure in the Qiongzhusi Formation in the Zizhong Area, Sichuan Basin |
| title_full | The Distribution Characteristics and Genesis Analysis of Overpressure in the Qiongzhusi Formation in the Zizhong Area, Sichuan Basin |
| title_fullStr | The Distribution Characteristics and Genesis Analysis of Overpressure in the Qiongzhusi Formation in the Zizhong Area, Sichuan Basin |
| title_full_unstemmed | The Distribution Characteristics and Genesis Analysis of Overpressure in the Qiongzhusi Formation in the Zizhong Area, Sichuan Basin |
| title_short | The Distribution Characteristics and Genesis Analysis of Overpressure in the Qiongzhusi Formation in the Zizhong Area, Sichuan Basin |
| title_sort | distribution characteristics and genesis analysis of overpressure in the qiongzhusi formation in the zizhong area sichuan basin |
| topic | Sichuan Basin Qiongzhusi Formation shale gas fluid pressure genesis of overpressure |
| url | https://www.mdpi.com/2076-3417/15/6/2888 |
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