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The in situ stress state is a key parameter for shale gas exploration and geodynamics. To obtain the ultra-depth stress state of the Xuefengshan area, the hydraulic fracturing in situ stress method was employed in this study to determine the stress state at a depth range of 170–2021 m. The test results, which are the first reported for borehole depth greater than 2000 m in China, show that the magnitude of the in situ stress increases with the depth of the borehole. At a depth of 2021 m, the measured maximum and minimum horizontal principal stresses were 66.31 MPa and 43.33 MPa, respectively. The linear fitting relationships between the maximum and minimum horizontal principal stresses with the depth of the test borehole were S H  = 0.033999D + 5.9996 and S h  = 0.020729D + 4.8058, respectively. In the borehole depth range of 170–800 m, the relationships of the three principal stresses were S H  &gt; S h  &gt; S V , which is favorable for reverse faulting. At borehole depths of 1000–2021 m, the relationships changed to S H  &gt; S V  &gt; S h , which implies that the deep stress regime of this area is strike-slip faulting.

Deep borehole in situ stress measurements by hydraulic fracturing method in Xuefengshan area