Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2022, Vol. 44 ›› Issue (6): 1-9.DOI: 10.11885/j.issn.1674-5086.2020.11.13.01

• GEOLOGY EXPLORATION •     Next Articles

In-situ Stress Logging Interpretation Methods and Reliability Analysis

WANG Zhaosheng1, ZENG Lianbo2, LI Jing3, LIU Daojie4, YU Jiangtao1   

  1. 1. College of Mining Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China;
    2. College of Geosciences, China University of Petroleum, Changping, Beijing 102249, China;
    3. Xinjiang Branch, Logging Company Limited, CNPC, Karamay, Xinjiang 834000, China;
    4. Jidong Oilfield Company Limited, CNPC, Tangshan, Hebei 063000, China
  • Received:2020-11-13 Published:2023-01-16

Abstract: In order to compare the difference in accuracy between borehole breakout, drilling-induced fracture and wave velocity anisotropy methods in interpreting in-situ stress orientation, the theoretical basis, interpretation methods and influencing factors of in-situ stress azimuth analysis by logging data were systematically expounded in this paper. The results show that the present-day maximum principal stress(SH) orientation of the third section of the Shahejie Formation in Well G6 is 70°~80°, interpreted by imaging logging data and combined with drilling-induced fracture and borehole breakout methods, which is consistent with the micro seismic monitoring results of adjacent wells. While the wave velocity anisotropy method and the borehole breakout method based on six arm dip-logging data interpret that the SH orientation is 80°~90°. The interpretation accuracy of in-situ stress orientation is affected by natural fracture, fault and formation dip angle, after comprehensive analysis, the in-situ stress orientation results are the most accurate interpreted by drilling-induced fracture method basing on imaging logging. There is a systematic error about 10° of the in-situ stress orientation interpreted by the borehole breakout method basing on the dip-logging in the study area. There are some limitations in the interpretation of in-situ stress orientation with dipole acoustic logging data and wave velocity anisotropy method, which need further correction.

Key words: in-situ stress, borehole breakout data, drilling-induced fracture, wave velocity anisotropy, interpretation method

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