Abstract:Drill Hole ZDSD-1 is the third scientific drilling hole in the Luobusha chromite deposit,belonging to the "continental scientific drilling:site selection and pilot hole" project,and its final depth is 1486.86 m.The drill hole implemented continuous coring and conducted geophysical well logging.The ultrasonic image logging data contained a mass of information about the borehole wall geological features,which played an important role in the identification of fractures,fracture zones and the analysis of tectonic stress field.Using the ultrasonic image logging data,the authors found that most fractures exhibit the form of dark stripes whose width changes obviously,the fracture zones in most cases exhibit littery dark patches,while they assume a large area of dark stripes where the strata are broken seriously, and the borehole breakouts exhibit a pair of symmetrical dark straight stripes or patches spacing 180 degree.Through the statistics of the orientation for 20 pairs of borehole breakouts,the authors infer that the orientation of the maximum horizontal principal stress for drill hole ZDSD-1 is 40.3°~218.4°.
刘东明, 林振洲, 高文利, 孔广胜, 贾定宇. 藏南泽当科学钻探ZDSD-1孔超声成像测井解释[J]. 物探与化探, 2017, 41(4): 672-677.
LIU Dong-Ming, LIN Zhen-Zhou, GAO Wen-Li, KONG Guang-Sheng, JIA Ding-Yu. Interpretation of ultrasonic imaging logging data obtained in Drill Hole ZDSD-1 of the Zedang Scientific Drilling in Tibet. Geophysical and Geochemical Exploration, 2017, 41(4): 672-677.
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