Earth Science Frontiers ›› 2024, Vol. 31 ›› Issue (2): 377-390.DOI: 10.13745/j.esf.sf.2023.11.38

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In situ stress state of deep basement in the Songliao Basin: Evidence from in situ stress measurement in SK-2 borehole

WANG Bin1,2(), SUN Dongsheng2,*(), LI Awei2, YANG Yuehui2, CHEN Qunce2   

  1. 1. Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China
    2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
  • Received:2023-06-16 Revised:2023-11-08 Online:2024-03-25 Published:2024-04-18

Abstract:

The magnitude and orientation information of in situ stresses in the basement of the Songliao Basin are important data in geodynamics research, seismology, and deep resources exploitation and utilization. The anelastic strain recovery (ASR) method is a three-dimensional in situ stress measurement method based on drill cores. In this report, three-dimensional in situ stresses at 6-7 km depth in basement of SK-2 borehole in the Songliao Basin, Northeast China, is determined using ASR method. The stress state of basement (6646-6846 m) is consistent with thrust and strike-slip faulting regime (σH>σV>σh) and the orientation of maximum horizontal principal stress is near E-W. The stress state determined by stress measurement is in agreement with results from focal mechanisms of shallow earthquakes (7-15 km) within the Songliao Basin and adjacent regions. The research findings should provide an important reference for the understanding of regional tectonic stress field and the formation and evolution of the Songliao Basin.

Key words: Songliao Basin, Scientific Drilling borehole (SK-2), in situ stress, anelastic strain recovery method, focal mechanism solution

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