库车坳陷博孜X区块超深储层有效裂缝分布规律及对天然气产能的影响

徐珂; 张辉; 鞠玮; 尹国庆; 王海应; 王志民; 王朝辉; 李超; 袁芳; 赵崴

doi:10.3799/dqkx.2022.227

Volume 48 Issue 7

Jul. 2023

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Article Navigation > Earth Science > 2023 > 48(7): 2489-2505

Xu Ke, Zhang Hui, Ju Wei, Yin Guoqing, Wang Haiying, Wang Zhimin, Wang Zhaohui, Li Chao, Yuan Fang, Zhao Wei, 2023. Effective Fracture Distribution and Its Influence on Natural Gas Productivity of Ultra-Deep Reservoir in Bozi-X Block of Kuqa Depression. Earth Science, 48(7): 2489-2505. doi: 10.3799/dqkx.2022.227

Citation:

Xu Ke, Zhang Hui, Ju Wei, Yin Guoqing, Wang Haiying, Wang Zhimin, Wang Zhaohui, Li Chao, Yuan Fang, Zhao Wei, 2023. Effective Fracture Distribution and Its Influence on Natural Gas Productivity of Ultra-Deep Reservoir in Bozi-X Block of Kuqa Depression. Earth Science, 48(7): 2489-2505. doi: 10.3799/dqkx.2022.227

Citation:

Xu Ke, Zhang Hui, Ju Wei, Yin Guoqing, Wang Haiying, Wang Zhimin, Wang Zhaohui, Li Chao, Yuan Fang, Zhao Wei, 2023. Effective Fracture Distribution and Its Influence on Natural Gas Productivity of Ultra-Deep Reservoir in Bozi-X Block of Kuqa Depression. Earth Science, 48(7): 2489-2505. doi: 10.3799/dqkx.2022.227

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Effective Fracture Distribution and Its Influence on Natural Gas Productivity of Ultra-Deep Reservoir in Bozi-X Block of Kuqa Depression

doi: 10.3799/dqkx.2022.227

1.
Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China
2.
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China

Received Date: 2022-01-06
Publish Date: 2023-07-25

Abstract

Abstract

To clarify the characteristics of fracture distribution in ultra-deep and tight sandstone reservoir in Kuqa Depression, based on the principle of fracture generated by paleo-stress and fracture effectiveness affected by current in-situ stress, determine fracture mechanical properties and pick fracture parameters according to core data and FMI logging data, the present-day in-situ stress field is predicted by structural recovery inversion of equivalent paleo-stress and finite element method, and combined with DFN discrete fracture grid modeling, the fractures of ultra-deep and tight sandstone reservoir in Bozi-X Block of Kelasu structural belt in Kuqa Depression are predicted. The results show that the tectonic fractures of Bozi-X gas reservoir are mainly unfilled semi-filled high angle shear fractures, and small-scale tensile fractures are developed locally. The majority of natural fractures in the study area were formed by rapid and strong compression in the Late Himalayas. From the Cretaceous to Neogene, high stress values moved southwards in Bozi-X area due to the continuous southward advancement of force source. The heterogeneity of tectonic fracture development and distribution in Bozi-X gas reservoir is extremely obvious. The development degree is high in Well X104 area in the northeast and low around Well X103 area in the southwest. Current in-situ stress has a significant impact on fracture effectiveness, and then affects the productivity of gas wells. The formation of fractures in Bozi-X block is jointly controlled by faults and folds. It is difficult to accurately predict the distribution of fractures only from the structural characteristics, but the prediction of fractures by geomechanical principles and methods has a good coincidence. Gas production cannot be evaluated and predicted only by porosity and reservoir thickness.
- ultra⁃deep tight sandstone reservoir,
- fracture prediction,
- fracture effectiveness,
- geomechanics,
- Kuqa Depression,
- petroleum geology

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References(83)

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Effective Fracture Distribution and Its Influence on Natural Gas Productivity of Ultra-Deep Reservoir in Bozi-X Block of Kuqa Depression

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