In-situ stress characteristics and fault stability analysis of hot dry rock GR2 well in Gonghe Basin

CHEN Dongfang; YANG Yuehui; NIU Zhaoxuan; WANG Hongwei; JIN Xianpeng; LI Zhenyu; WU Haidong; LIU Donglin

doi:10.12029/gc20230901003

GEOLOGY IN CHINA > 2025 > Uncorrected proof > DOI: 10.12029/gc20230901003

Chen Dongfang, Yang Yuehui, Niu Zhaoxuan, Wang Hongwei, Jin Xianpeng, Li Zhenyu, Wu Haidong, Liu Donglin. 2025. In-situ stress characteristics and fault stability analysis of hot dry rock GR2 well in Gonghe Basin[J]. Geology in China, 52(2): 1−13. DOI: 10.12029/gc20230901003

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In-situ stress characteristics and fault stability analysis of hot dry rock GR2 well in Gonghe Basin

CHEN Dongfang^{1, 2, 3,},
YANG Yuehui⁴,
NIU Zhaoxuan^{1, 2, 3},
WANG Hongwei^{1, 2, 3},
JIN Xianpeng^{1, 2, 3, ,},
LI Zhenyu⁵,
WU Haidong¹,
LIU Donglin^{1, 2, 3}

1.
Center for Hydrogeology and Environmental Geology, China Geological Survey, Tianjin 300309, China
2.
Technical Innovation Center for Geothermal & Hot Dry Rock Exploration and Development,Ministry of Natural Resources, Tianjin 300309, China
3.
Tianjin Engineering Center of Geothermal Resources Exploration and Development, Tianjin 300309, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
5.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037,China

Funds: Supported by the National Key Research and Development Program (No.2021YFB1507404) and the projects of China Geological Survey (No.DD20211336, No.DD20230018).

More Information

Author Bio:
CHEN Dongfang, male, born in 1992, master, engineer, engaged in the the field of in-situ stress and rock mechanics-related work; E−mail：chendongfang@mail.cgs.gov.cn
Corresponding author:
JIN Xianpeng, male, born in 1983, senior engineer, mainly engaged in hot dry rock development related work; E−mail：jinxp@mail.cgs.gov.cn.
Received Date: August 31, 2023
Revised Date: November 08, 2023
Available Online: March 07, 2025

Graphical Abstract

Abstract

Abstract

This paper is the result of geological survey engineering.
Objective
The magnitude and direction of in−situ stress are important parameters for well placement, fracturing design and reservoir evaluation in hot dry rock development. It is of great significance to study reservoir stress state for hot dry rock development.
Methods
In this paper, the characteristics of current stress field in Gonghe Basin are analyzed based on regional geological structure evolution, focal mechanism solution and inversion results, statistics of joints and fissures, and in−situ stress measured data. Combined with the reservoir structure and stratigraphic lithofacies characteristics of GR2 well, a three−dimensional model is established, and the three−dimensional in−situ stress data of GR2 well in Gonghe Basin is obtained through numerical simulation by using orthogonal anisotropic elastic constitutive relation. The regional tectonic stress field and occurrence conditions of dry hot rock resources are discussed.
Results
① The simulated stress distribution is consistent with the theoretical value, which meets the requirements of initial displacement accuracy, and finally predicts the distribution characteristics of in−situ stress field in the well. ② In the depth range of 500~4500 m, the relationship of three principal stresses is principal stress is σ_v>σ_H>σ_h, indicating that the stress structure in this region is favorable to normal fault activity. ③ The maximum horizontal principal stress direction of Gonghe Basin in Qinghai province is mainly NE direction compression deformation, which is conducive to low fluid permeability and low heat transfer of granite. ④ Under the action of a unified regional stress field, the faults may be come instability near the injecting well, when the continuous injection pressure on the ground reaches or exceeds about 19.9 MPa during the water injection development of 3900~4500 m depth in the study area, leading to the occurrence of medium and small earthquakes, which should be prevented in the development and utilization of the hot dry rock.
Conclusions
This study have certain reference value for geodynamics research and the safe development and utilization of dry hot rock in Gonghe Basin.
- the development of hot dry rock,
- in−situ stress,
- 3D numerical simulation,
- fault activity,
- geological survey engineering,
- Gonghe Basin,
- Qinghai Province
Highlights
(1) The characteristics of regional stress field in Gonghe Basin were analyzed based on geological structure evolution, focal mechanism solution inversion, joint fracture statistics and in−situ stress measurement data. (2) The in−situ stress data of hot dry rock GR2 well were obtained by numerical simulation, the stability of faults in the study area was analyzed, and the influence of water injection pressure on the stability of nearby faults was quantitatively evaluated from the perspective of hot dry rock development.

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References (75)

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In-situ stress characteristics and fault stability analysis of hot dry rock GR2 well in Gonghe Basin

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