Evaluation and optimization of "engineering sweet spot" in deep shale reservoir: case study on Yongchuan and Dingshan areas in southern Sichuan

GE Xun; GUO Tonglou; LI Maowen; ZHAO Peirong; DENG Hucheng; LI Wangpeng; ZHONG Cheng

doi:10.11781/sysydz202302210

Volume 45 Issue 2

Mar. 2023

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Article Navigation > PETROLEUM GEOLOGY & EXPERIMENT > 2023 > 45(2): 210-221

GE Xun, GUO Tonglou, LI Maowen, ZHAO Peirong, DENG Hucheng, LI Wangpeng, ZHONG Cheng. Evaluation and optimization of 'engineering sweet spot' in deep shale reservoir: case study on Yongchuan and Dingshan areas in southern Sichuan[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(2): 210-221. doi: 10.11781/sysydz202302210

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GE Xun, GUO Tonglou, LI Maowen, ZHAO Peirong, DENG Hucheng, LI Wangpeng, ZHONG Cheng. Evaluation and optimization of "engineering sweet spot" in deep shale reservoir: case study on Yongchuan and Dingshan areas in southern Sichuan[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(2): 210-221. doi: 10.11781/sysydz202302210

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Evaluation and optimization of "engineering sweet spot" in deep shale reservoir: case study on Yongchuan and Dingshan areas in southern Sichuan

doi: 10.11781/sysydz202302210

1.
Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 102206, China
2.
Southwest Oil and Gas Branch Company, SINOPEC, Chengdu, Sichuan 610041, China
3.
Oilfield Exploration & Production Department, SINOPEC, Beijing 100728, China
4.
College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, China
5.
School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210033, China

Received Date: 2022-11-09
Rev Recd Date: 2023-02-09
Publish Date: 2023-03-28

Abstract

Abstract

In the Sichuan Basin, geologic conditions are complex in deep layers. Burial depth of shale reservoirs is high. Gas well productivity is widespread low, and hydraulic fracturing confronts with extremely large challenges. In order to search for "engineering sweet spots" of deep shale gas layers, Yongchuan and Dingshan areas were taken as the examples. In-depth discussion was conducted on affecting factors of hydraulic fracturing results in deep shale reservoirs by drilling, core, imaging logging and seismic data, based on measured rock mechanical parameters, development degree of natural fractures, natural fracture effectiveness, horizontal stress difference and included angle between horizontal well track and the minimum main horizontal stress. Study results demonstrated that No.3¹ sublayer of the first member of Longmaxi Formation in Yongchuan and Dingshan areas, southern Sichuan had the best brittleness as the first-choice target horizon for hydraulic fracturing. Shorter distance from the faults, higher pump pressure and operational pressure, and smaller reconstructed volume. Good extension and turning capacity of the fractures could beguaranteed when included angle between hydraulic and natural fractures was roughly 55°. In silicon-rich shale and faulting zones, lower minimum main horizontal stress, easier-diffused hydraulic fractures. Higher included angle between horizontal well track and maximum main horizontal stress azimuth, better fracturing results. Finally, evaluation index system of "engineering sweet spots" for marine shale gas in complex structural areas of Yongchuan and Dingshan was constructed. Class Ⅰ geologic and engineering "sweet spots" were optimized in Yongchuan and Dingshan areas.
- deep shale layer,
- engineering sweet spots,
- gas well productivity,
- fracturing operation,
- No.3¹ sublayer of the first member of Longmaxi Formation,
- Sichuan Basin

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References

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Evaluation and optimization of "engineering sweet spot" in deep shale reservoir: case study on Yongchuan and Dingshan areas in southern Sichuan

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Evaluation and optimization of "engineering sweet spot" in deep shale reservoir: case study on Yongchuan and Dingshan areas in southern Sichuan

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