柴达木盆地狮子沟构造下干柴沟组上段有效裂缝与地应力关系及其意义

吴嘉伟; 张长好; 司丹; 朱立林; 沙威; 程丰; 郭召杰

doi:10.3799/dqkx.2022.114

Volume 48 Issue 7

Jul. 2023

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Article Navigation > Earth Science > 2023 > 48(7): 2557-2571

Wu Jiawei, Zhang Changhao, Si Dan, Zhu Lilin, Sha Wei, Cheng Feng, Guo Zhaojie, 2023. Relation between Effective Fractures and In-Situ Stress as well as Its Significance in Upper Xiaganchaigou Formation in Shizigou Structure, Qaidam Basin. Earth Science, 48(7): 2557-2571. doi: 10.3799/dqkx.2022.114

Citation:

Wu Jiawei, Zhang Changhao, Si Dan, Zhu Lilin, Sha Wei, Cheng Feng, Guo Zhaojie, 2023. Relation between Effective Fractures and In-Situ Stress as well as Its Significance in Upper Xiaganchaigou Formation in Shizigou Structure, Qaidam Basin. Earth Science, 48(7): 2557-2571. doi: 10.3799/dqkx.2022.114

Citation:

Wu Jiawei, Zhang Changhao, Si Dan, Zhu Lilin, Sha Wei, Cheng Feng, Guo Zhaojie, 2023. Relation between Effective Fractures and In-Situ Stress as well as Its Significance in Upper Xiaganchaigou Formation in Shizigou Structure, Qaidam Basin. Earth Science, 48(7): 2557-2571. doi: 10.3799/dqkx.2022.114

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Relation between Effective Fractures and In-Situ Stress as well as Its Significance in Upper Xiaganchaigou Formation in Shizigou Structure, Qaidam Basin

doi: 10.3799/dqkx.2022.114

Wu Jiawei^{1
,
,},
Zhang Changhao²,
Si Dan²,
Zhu Lilin²,
Sha Wei²,
Cheng Feng¹,
Guo Zhaojie^{1
,
,
,}

1.
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2.
Qinghai Oilfield Company, PetroChina, Dunhuang 736200, China

Received Date: 2021-12-31
Publish Date: 2023-07-25

Abstract

Abstract

In the SW Qaidam Basin, fractures are widely developed in tight lacustrine carbonate rocks of the Upper Xiagnchaigou Formation in the Shizigou structure, which is the key factor controlling the high production of hydrocarbon. The purpose of this study is to establish the present-day in-situ stress state and distribution patterns of fracture attitudes, which is significant to determine effective fractures and to design horizontal well orientations considering hydraulic fracture distribution. In this study, fracture characteristics were revealed in cores and thin sections. The spatial relation between deep faults and trajectories of Well A, Well B and Well C was extracted from 3D seismic data. We selected horizontal intervals of Well A and Well B to construct in-situ stress profiles and image log intervals of Well A and Well C to count fracture attitudes which were further shown by stereonets, rose diagrams and fracture dip histograms. Horizontal intervals of three selected wells are nearly parallel to the NW-trending faults belonging to the strike-slip positive flower structure. Geostress logging shows that the measuring intervals in the Upper Xiaganchaigou Formation are under the strike-slip faulting stress state. Most unfilled conductive fractures and filled resistive fractures have NE strikes and high to near-vertical dips, and they were dominated by the strike-slip faulting stress state whose maximum horizontal principal stress is in the NE direction since the Early Miocene. Unfilled fractures and dissolved fractures which were previously filled can act as hydrocarbon reservoirs and migration pathways. NE-trending unfilled fractures with vertical dips are the most effective fractures. If NE-trending horizontal wells are drilled near NW-trending main faults, more natural fractures will be met, and NE-trending hydraulic fractures with vertical dips are effective. The design of NE-trending horizontal wells is worth considering due to the poor production of NW-trending horizontal wells.
- fractured reservoir,
- image log,
- in-situ stress state,
- horizontal well,
- Qaidam Basin,
- geomechanics

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References(60)

References

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Relation between Effective Fractures and In-Situ Stress as well as Its Significance in Upper Xiaganchaigou Formation in Shizigou Structure, Qaidam Basin

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