Advances in Earth Science ›› 2023, Vol. 38 ›› Issue (12): 1271-1284. doi: 10.11867/j.issn.1001-8166.2023.070

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Distribution Characteristics and Pattern of Deep Shale Present Geostress Field in Northern Luzhou

Shaojun LIU 1 , 2 , 3( ), Yong LIU 1, Shengxian ZHAO 1 , 2 , 3, Jian ZHANG 1 , 2 , 3, Naier DENG 4, Hucheng DENG 4, Jianhua HE 4, Hao XU 4( ), Lieyan CAO 2 , 3, Yuanhan HE 2 , 3, Meixuan YIN 2 , 3   

  1. 1.Petro China Southwest Oil & Gasfield Company, Chengdu 610051, China
    2.Shale Gas Research Institute, Petro China Southwest Oil & Gasfield Company, Chengdu 610051, China
    3.Key Laboratory of Shale Gas Evaluation and Exploitation of Sichuan Province, Chengdu 610051, China
    4.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation on Chengdu University of Technology, Chengdu 610059, China
  • Received:2023-07-09 Revised:2023-10-13 Online:2023-12-10 Published:2023-12-26
  • Contact: Hao XU;
  • About author:LIU Shaojun, Senior engineer, research areas include shale gas exploration and development. E-mail:
  • Supported by:
    Projecti supported by the National Natural Science Foundation of China(42002157);Sichuan Science and Technology Programme Outstanding Young Scientific and Technological Talents Project(2020JDJQ0058);Chengdu University of Science and Technology 2022 Young and Middle-aged Cadre Teachers Development Funding Scheme(10912-SJGG2022-07702)

Shaojun LIU, Yong LIU, Shengxian ZHAO, Jian ZHANG, Naier DENG, Hucheng DENG, Jianhua HE, Hao XU, Lieyan CAO, Yuanhan HE, Meixuan YIN. Distribution Characteristics and Pattern of Deep Shale Present Geostress Field in Northern Luzhou[J]. Advances in Earth Science, 2023, 38(12): 1271-1284.

Stress field characterization and evaluation is an important part of deep shale gas exploration and development, and is important in guiding the prediction of fracture crack direction, well network deployment, and horizontal well location deployment. Using the Longyi 1 subsection in Luzhou North District, Sichuan Basin, as an example; through indoor experiments, logging interpretation comparison, and stress field simulation prediction; we established the conversion relation equation of rock mechanics dynamic and static parameters, clarified the single well geostress characteristics, and completed the stress field perturbation analysis. This enabled us to realize the zoning portrayal of the stress field in the study area. The results of the study showed that: the rock mechanical parameters show the characteristics of “high Young’s modulus and low Poisson's ratio,” which indicates that the target layer is highly brittle. The three-directional stress increased with increasing burial depth, and the relationship between the stresses was as follows: SH > Sv > Sh . A comparison and analysis of the four stress direction discrimination methods showed that the maximum horizontal principal stresses in the study area ranged 105-115°. The Fuji oblique inclination was deflected counter-clockwise with respect to the regional stress direction in the range 75-85°, whereas the Desheng oblique inclination often maintained the regional stress direction. Comparing the regional stress state, the dorsal inclined area was shown to be affected by the tensile stress, with the stress value decreasing and the stress direction being deflected clockwise, whereas the oblique inclined area showed the opposite tendency owing to the influence of the extruding stress. The maximum range of stress perturbation by fractures reaches up to 1.8 km, and the intensity of stress perturbation by fractures with different strikes is ranked as NEE, NE, and NNE. Based on the characteristics of fractures and stress field perturbations, the study area was classified into three types: adjusting, transforming, and stabilizing zones. The results of this study provide effective support for the optimization of subsequent development units to achieve a steady increase in the average EUR of a single well.

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