Variation characteristics of three-direction principal stress and logging parameters with depth (IMAGE)
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(a) Variation characteristics of Young’s modulus, three-direction principal stress values, Gamma ray measurements, and resistivity of borehole GQX-1 with depth. (b) Variation characteristics of Young’s modulus, three-direction principal stress values, Gamma ray measurements, and resistivity of borehole GQX-5 with depth. (c) Young’s modulus, the maximum horizontal principal stress, Gamma ray and resistivity of the measured section of in situ stress at different depths in borehole GQX-1. The correlation coefficients between SH and Young’s modulus, Gamma ray measurements, and resistivity are 0.31, −0.21, and −0.24, respectively; the stress of borehole GQX-1 was greater than 48 MPa in the depth range of 535–744 m, and the maximum stress reached 60 MPa. Even if the influence of the topographic elevation difference of approximately 800 m on stress is excluded, the corrected measured values of each depth section reached 33.20–44.56 MPa, indicating high stress.
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