A Prediction Method for Brittleness Index of Transversely Isotropic Shale Formation
A technology of transverse isotropy and brittleness index, applied in seismology for logging records, etc., can solve problems such as distortion of shale brittleness index evaluation results, neglect of brittle anisotropy and errors in shale formations, and achieve Accurately reflect the effect
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[0064] Taking the Longmaxi shale at a depth of 3171 meters in Well X1 as an example, the elastic modulus and Poisson's ratio of the transversely isotropic shale at this depth are: E 1 =46.37GPa,E 3 =36.41GPa, ν 12 =0.24, ν 13 =0.27, ν 31 = 0.21.
[0065] The brittleness index corresponding to different well inclination angle β was simulated. During the simulation process, the well inclination angle β increased from 0° to 360° with a step size of 5°. The simulation results are as follows: figure 2 shown.
[0066] Considering the symmetry of the rock elastic parameters with respect to the β angle, only the rock elastic parameters in the range of 0° to 90° are analyzed. Brittleness index BI 2_β The brittleness index in the direction parallel to the bedding plane (90°) is higher than that in the direction perpendicular to the bedding plane (0°). In conventional rock uniaxial compression tests, rock samples usually split along the 45° angle, indicating that shear failure is...
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